Class / Patent application number | Description | Number of patent applications / Date published |
375144000 | Having multi-receiver or interference cancellation | 64 |
20080253432 | NOISE POWER ESTIMATION APPARATUS, NOISE POWER ESTIMATION METHOD AND SIGNAL DETECTION APPARATUS - A noise power estimation apparatus is disclosed. The noise power estimation apparatus includes: a part for calculating correlation between a received signal and a pilot signal so as to obtain a received power of the pilot signal for each path; a part for removing a multipath interference component from the received power of the pilot signal by using a predetermined power ratio between the pilot signal and a data signal so as to obtain a corrected received power of the pilot signal; a part for estimating an estimated total power of the pilot signal and the data signal included in the received signal based on the corrected received power and the predetermined power ratio; and a part for subtracting the estimated total power from a total power of the received signal so as to obtain a noise power. | 10-16-2008 |
20080260002 | ANTENNA SELECTION AND TRAINING USING A SPATIAL SPREADING MATRIX FOR USE IN A WIRELESS MIMO COMMUNICATION SYSTEM - A wireless communication system and method uses a spatial spreading matrix to distribute the encoded spatial data streams to a number of transmit chains and further uses the spatial spreading matrix for antenna selection computation in a transmitter. The spatial spreading matrix is designed such that a receiver is able to know and utilize the spatial spreading matrix for computing transmission antenna selection, receiver antenna selection and joint transmission/receiving antenna selection. The use of this spatial spreading matrix for antenna selection computation provides increased accuracy in antenna selection for transmission of spatial data streams, where the number of spatial data streams is less than the number of transmit or receive chains between the transmitter and receiver, and the number of transmit or receive chains is less than the corresponding transmission or receiving antennas. | 10-23-2008 |
20080291978 | Receiver Parametric Covariance Estimation for Transmit Diversity - A parametric form of G-Rake and chip equalization for closed-loop transmit diversity is provided, that accounts for impairment correlation between transmit antennas. In a closed-loop transmit diversity system, the base station transmits a signal from two or more antennas, using one of a predetermined set of relative phase offsets at one of the antennas. The parametric estimation of the impairment or data covariance is performed by summing terms, including a term for each possible phase offset. The terms are weighted by fitting parameters. The fitting parameters are jointly solved by fitting the impairment or data covariance estimate to a measured impairment or data covariance. In another aspect, a measured impairment covariance is formed by exploiting a special relationship between the pilot channels of the different transmit antennas. | 11-27-2008 |
20080298437 | CANCELLATION OF BURST NOISE IN A COMMUNICATION SYSTEM WITH APPLICATION TO S-CDMA - A communication system performs burst noise cancellation. A transmitter produces and transmits a spread signal that comprises at least one known-value symbol spread by a plurality of non data-carrying orthogonal codes and data symbols spread by at least one data-carrying orthogonal code. The transmitter transmits the spread signal across a communication link that introduces burst noise. A burst noise detector determines burst noise affected chips of the orthogonal codes. A weight computation functional block calculates a plurality of complex-valued combining weights based upon the burst noise affected chips. A vector de-spreader and a linear combiner operate in combination to use the plurality of non data-carrying orthogonal codes, the at least one data-carrying orthogonal code, and the plurality of complex-valued combining weights to de-spread the received spread signal to produce the data symbols with the burst noise substantially removed. | 12-04-2008 |
20090080499 | INTERFERENCE MANAGEMENT EMPLOYING FRACTIONAL CODE REUSE - Interference that occurs during wireless communication may be managed through the use of fractional reuse and other techniques. In some aspects fractional reuse may relate to HARQ interlaces, portions of a timeslot, frequency spectrum, and spreading codes. Interference may be managed through the use of a transmit power profile and/or an attenuation profile. Interference also may be managed through the use of power management-related techniques. | 03-26-2009 |
20090097532 | FEEDBACK OF DECODED DATA CHARACTERISTICS - A method for successive interference cancellation in code division multiple access (CDMA) systems is provided that uses variable interferer weights. This method allows interfering signals to be cancelled in order to recover a transmitted data signal. This method involves receiving the data signal subject to interference from at least one interfering signal. A first interfering signal is identified. Then an interferer weight coefficient associated with the first interfering signal is generated. This allows the first interfering signal to be cancelled from the received data signal using the interferer weight coefficient. These processes may then be reiterated for other interfering signals. It is then possible to recover the transmitted data signal from the received data signal. | 04-16-2009 |
20090147832 | Wireless communication system and method - A wireless communication system includes a heterogeneous wireless station for transmitting and receiving a heterogeneous wireless station signal; and a detection and avoidance device for detecting the heterogeneous wireless station signal, and for transmitting and receiving an ultra-wideband signal, the ultra-wideband signal with a reduced output or the ultra-wideband signal shifted to another ultra-wideband or ultra-wideband group in order to prevent interference with the heterogeneous wireless station based on a predetermined level. Further, a communication method includes receiving a heterogeneous wireless station signal; converting the heterogeneous wireless station signal into tone-nulling elements based on a predetermined level; receiving the tone-nulling elements, and generating an ultra-wideband signal or reducing an output of the ultra-wideband signal; and changing a time frequency number of the ultra-wideband signal based on the values of the tone-nulling elements to selectively shift to another band of the band group or another band group. | 06-11-2009 |
20090238244 | METHOD FOR OPERATING A RAKE RECEIVER - A rake receiver and method for operating a rake receiver is provided including receiving a signal in a rake receiver having at least one finger, each of the at least one finger characterized by a channel phase and a channel frequency, removing a phase and a portion of the frequency component of the signal in a first block of the at least one finger, and removing a remaining frequency component of the signal in a second block of the at least one finger. | 09-24-2009 |
20090304047 | Method of controlling interference between communication terminals - A method of controlling interference between communication terminals involves sending a notification of a desire to transmit a transmission over a wireless network from a first terminal; determining whether any terminal in the process of receiving has sent an objection in response to the notification; sending the transmission if no objection is received, and modifying the transmission if an objection is received. | 12-10-2009 |
20090323774 | DATA EQUALISATION IN A COMMUNICATION RECEIVER WITH TRANSMIT AND RECEIVE DIVERSITY - A method of performing data equalization in a communication receiver with transmit and receive diversity includes (a) for each i-th receiver antenna and j-th transmitter antenna, calculating a channel response matrix H | 12-31-2009 |
20090323775 | TRANSMIT PROCESSING USING RECEIVER FUNCTIONS - A method and apparatus for transmitting data in code division multiple access communications. The method includes processing spread first data with a channel response matrix using an equalization circuit to pre-equalize the spread data to compensate for a channel response prior to transmission. The pre-equalized data is received and recovered by a receiver. Second data, transmitted from the receiver, is received and recovered using the equalization circuit to equalize the second data to compensate for a channel response that the first data encountered. | 12-31-2009 |
20100067563 | METHOD AND SYSTEM OF COMMUNICATIONS - A communications estimation, in radio communications systems, particularly in CDMA type of systems, of signal to interference ratio, signal to noise ratio and signal to interference and noise ratio, includes one or more channel specific parameters in addition to one or more parameters related to received signal, noise or interference. | 03-18-2010 |
20100080267 | INTERFERENCE SUPPRESSING OFDM SYSTEM FOR WIRELESS COMMUNICATIONS - An IS-OFDM system for point-to-point wireless communications that suppresses narrow-band interference comprises an IS-OFDM transmitter and an IS-OFDM receiver, wherein a transmitted signal comprises a plurality of subcarriers, and further wherein each subcarrier contains more than one and potentially all symbols transmitted in a given frame. The IS-OFDM transmitted signal is at a data rate that is equal to the data rate of the input data stream via the use of P/S converters. | 04-01-2010 |
20100091820 | Position Indicating Process - A position indicating process includes the steps of receiving at least four radio signals emitted by different transmitter stations; determining a channel pulse response of the transmission channel for each of the received radio signals; estimating the direct signal path for each of the received radio signals based on the respectively determined channel pulse response; and determining the receiving position of the radio signals by evaluating the estimated direct signal paths of the received radio signals. | 04-15-2010 |
20100111141 | Cancellation of burst noise in a communication system with application to S-CDMA - A communication system performs burst noise cancellation. A transmitter produces and transmits a spread signal that comprises at least one known-value symbol spread by a plurality of non data-carrying orthogonal codes and data symbols spread by at least one data-carrying orthogonal code. The transmitter transmits the spread signal across a communication link that introduces burst noise. A burst noise detector determines burst noise affected chips of the orthogonal codes. A weight computation functional block calculates a plurality of complex-valued combining weights based upon the burst noise affected chips. A vector de-spreader and a linear combiner operate in combination to use the plurality of non data-carrying orthogonal codes, the at least one data-carrying orthogonal code, and the plurality of complex-valued combining weights to de-spread the received spread signal to produce the data symbols with the burst noise substantially removed. | 05-06-2010 |
20100135361 | CDMA RECEIVERS AND CDMA COMMUNICATIONS SYSTEMS - A CDMA communications system includes a primary station and at least one secondary station. The secondary station includes a receiver for receiving CDMA signals transmitted on the downlink. The receiver includes a plurality of Rake finger receivers having inputs for receiving signals and outputs coupled to a combining stage for combining their output signals constructively, a finger assignment stage for assigning the finger receivers to respective received signals, a processing stage for estimating the speed of the CDMA receiver from the signals received and for varying the time required to make a finger replacement decision in response to the estimated speed so that the time required decreases as the speed of the receiver increases and vice versa. | 06-03-2010 |
20100177805 | Multipath Tracking Device and Method in A CDMA Communication System - A multipath tracking device and method in a CDMA communication system adds a middle path power estimation unit, a normalization processing unit and a nonlinear mapping unit in an existing multipath tracking device. A precise current middle path signal power is acquired by the middle path power estimation unit; the normalization processing is performed for the power errors of the late, early path signals in the normalization processing unit, and thus the impact of the middle path signal power on the power error is eliminated, the active normalization for the power error is realized; after obtaining the smooth and stable normalized power error signal, the precise delay error signal is determined in the nonlinear mapping unit according to the nonlinear mapping relation between the normalized power error signal and the delay error signal, thereby the precise voltage control signal is acquired. | 07-15-2010 |
20100246640 | FEEDBACK OF DECODED DATA CHARACTERISTICS - A method for successive interference cancellation in code division multiple access (CDMA) systems is provided that uses variable interferer weights. This method allows interfering signals to be cancelled in order to recover a transmitted data signal. This method involves receiving the data signal subject to interference from at least one interfering signal. A first interfering signal is identified. Then an interferer weight coefficient associated with the first interfering signal is generated. This allows the first interfering signal to be cancelled from the received data signal using the interferer weight coefficient. These processes may then be reiterated for other interfering signals. It is then possible to recover the transmitted data signal from the received data signal. | 09-30-2010 |
20100278216 | METHOD AND SYSTEM FOR INTER-CELL INTERFERENCE CANCELLATION - Systems and methods for inter-cell interference cancellation are provided. In one aspect of the disclosure, an apparatus is provided. The apparatus comprises a cell computation unit configured to compute receive chips for a first interfering cell and a subtraction unit configured to remove the computed receive chips for the first interfering cell from received chips at a receiver. The apparatus further comprises a processing unit configured to process the received chips with the computed receive chips for the first interfering cell removed into received symbols and a detection unit configured to detect user symbols for a target cell from the received symbols. | 11-04-2010 |
20100309955 | MITIGATING NOISE CREATED BY SPREAD SPECTRUM CLOCKS - A platform to mitigate noise caused by spread spectrum clock signals. The platform may comprise a noise mitigation block, which may include a first set of analog-to-digital converters, a second analog-to-digital, and a noise canceller. The first set of analog-to-digital converters may generate clock samples by digitizing the plurality of spread spectrum clock signals, which are provided as inputs to the noise mitigation block. The second analog-to-digital converter may generate data samples by digitizing the data signal. The noise canceller coupled to the first set of analog-to-digital converters and the second analog-to-digital converter may identify an interference portion in the data signal using the clock samples and the data samples and remove the interference portion from the data signal. | 12-09-2010 |
20100309956 | METHOD AND SYSTEM FOR INTERFERENCE CANCELLATION - Systems and methods for interference cancellation at a receiver in a wireless communication system are provided. In one aspect, a method for interference cancellation is provided. The method comprises providing total received chips received from a plurality of cells. The method also comprises successively estimating received chips for each of the plurality of cells in a plurality of iterations, wherein each of the plurality of iterations after a first iteration comprises canceling previously estimated received chips for one or more of the plurality of cells from the total received chips, and estimating received chips for one of the plurality of cells using the total received chips with the previously estimated received chips for the one or more of the plurality of cells cancelled out. | 12-09-2010 |
20110026566 | PILOT-BASED SINR ESTIMATION FOR MIMO SYSTEMS - A combination of parametric and non-parametric approaches are disclosed for enabling pilot-based SINR estimation for MIMO systems. The pilot-based SINR estimation embodiments account for precoding applied during either single-stream or multi-stream data transmission. The pilot-based SINR estimation embodiments also account for code reuse interference which arises during multi-stream data transmission when spreading codes are reused on the data channel. Accordingly, mismatches that exist between the data channel and the pilot channel because of precoding and/or code reuse are inherently accounted for by the pilot-based SINR estimation embodiments disclosed herein. | 02-03-2011 |
20110075706 | CHANNEL GEOMETRY DETECTOR - Adaptive reconfiguration of a wireless receiver is enabled based on channel geometry. According to an embodiment, the wireless receiver includes a geometry factor processing module and signal processing modules, e.g. such as but not limited to an SIR estimation module, a power estimation module, a despreading module, a low-pass filter, a combing weight generation module, a coefficient estimation module, a synchronization control channel interference canceller module, etc. The geometry factor processing module determines a geometry factor for the channel over which signals are transmitted to the wireless receiver, the geometry factor being a measure of the ratio of total transmitted power received by the wireless receiver to total interference plus noise power at the wireless receiver. One or more of the receiver signal processing modules are reconfigurable based on the geometry factor. | 03-31-2011 |
20110075707 | Reducing Inter-Carrier-Interference in OFDM Networks - Embodiments of the invention disclose a system and a method for reducing inter-carrier interference (ICI) in a network, wherein the network uses orthogonal frequency division multiplexing (OFDM). The method generates, in a transmitter, a diversified signal, wherein a diversified signal includes diversified elements representing data elements, such that each data element is represented by a number of diversified elements, wherein the number equals a degree of diversity. The diversified signal is modified based on an orthogonal matrix producing a spread signal, wherein columns of the orthogonal matrix are formed by vectors, wherein the vectors are orthogonal or quasi-orthogonal to each others, and the spread signal is transmitted in the network. | 03-31-2011 |
20110075708 | METHOD AND SYSTEM FOR PER-CELL INTERFERENCE ESTIMATION FOR INTERFERENCE SUPPRESSION - A wireless system may receive a plurality of multipath signals from a plurality of transmitters and allocate per-cell modules for generating an interference suppressed signal from the multipath signals. Data symbols may be sequentially processed in the received multipath signals utilizing the per-cell modules and subtracting the processed symbols from a residual buffer storing the received multipath signals. Desired information received from one or more of the transmitters may be recovered utilizing the interference suppressed signal. Timing of the data symbols may be correlated utilizing a cell chip combiner. The data symbols may be descrambled utilizing conjugated scrambling codes associated with one of the plurality of transmitters. Orthogonal variable spreading factor (OVSF) codes may be generated utilizing a Walsh transform on the data symbols. Power levels of the OVSF codes may be estimated and estimated signals may be generated based on the OVSF codes and the estimated power levels. | 03-31-2011 |
20110096812 | METHOD AND SYSTEM FOR DIVERSITY PROCESSING UTILIZING A PROGRAMMABLE INTERFACE SUPPRESSION MODULE - Aspects of a method and system for diversity processing utilizing a programmable interface suppression module may include one or more circuits that are operable to program an interference suppression module based on one or more interference cancellation parameters. A plurality of weighting factor values may be computed based on the one or more interference suppression parameters and a received plurality of multipath signals. A plurality of estimated signals may be generated based on the plurality of weighting factor values. A plurality of updated estimated signals may be generated based on the plurality of estimated signals. A plurality of interference suppressed signals may be generated based on the plurality of updated estimated signals. | 04-28-2011 |
20110243195 | INTERFERENCE SUPPRESSING OFDM SYSTEM FOR WIRELESS COMMUNICATIONS - An IS-OFDM system for point-to-point wireless communications that suppresses narrow-band interference comprises an IS-OFDM transmitter and an IS-OFDM receiver, wherein a transmitted signal comprises a plurality of subcarriers, and further wherein each subcarrier contains more than one and potentially all symbols transmitted in a given frame. The IS-OFDM transmitted signal is at a data rate that is equal to the data rate of the input data stream via the use of PIS converters. | 10-06-2011 |
20120014416 | Narrowband Interference Cancellation Method and Circuit - A narrowband interference (NBI) canceller is coupled to an A/D converter to receive an input signal and supply an NBI-canceled signal to an error correcting decoder. In the NBI canceller, a first arithmetic unit receives the input signal and a predicted-interference signal, and supplies a difference thereof as the interference-canceled signal. A slicer receives the interference-canceled signal and supplies a decision signal. A second arithmetic unit subtracts the decision signal from the input signal to generate a noise signal. A coarse frequency estimator receives the noise signal and analyzes the frequency spectrum to generate a coarse estimate of a fundamental frequency of the NBI. The coarse estimate is used by an adaptive narrowband interference predictor to generate the predicted-interference signal while adaptively tracking the narrowband interference. Use of the NBI canceller in a transceiver can eliminate link drop caused by operation of wireless devices that generate EMI in a cable. | 01-19-2012 |
20120093200 | CONTINUOUS ORTHOGONAL SPREADING CODE BASED ULTRA-HIGH PERFORMANCE ARRAY ANTENNA SYSTEM - Provided are a beamforming receiving/transmitting function and a beamforming receiving/transmitting structure, which are optimized for a given basic system in order to provide advanced performance in consideration of a wireless mobile communication system through a ultra-high performance CDMA array antenna based on continuously orthogonal spreading codes and a pre-rake scheme for non-interference communication. Also, there is provided a chip-level/symbol-level beamforming receiving/transmitting apparatus based on a multiple-input multiple-output (MIMO) system on a forward/backward link in order to be applied to various advanced wireless mobile communication applications by improving the performance and capacity of a Code Division Multiple Access (CDMA) array antenna system based on continuously orthogonal spreading codes and a pre-rake scheme for non-interference communication, and a forward and backward link automatic beamforming method. Accordingly, a ultra-high performance base station and terminal having no-interference reception performance as well as achieving high hardware and power efficiency may be realized. | 04-19-2012 |
20120128036 | RECEIVER AND METHOD FOR RECEIVING DATA IN HUMAN BODY COMMUNICATION SYSTEM USING MULTIPLE RECEIVERS - There are provided a receiver in human body communication system using multiple receivers capable of reducing an error rate of receiver signals by applying a space diversity acquisition-related SIMO technology to a plurality of received data using multiple receivers or receiver electrodes in a human body communication system using a human body as a medium, and of stably transmitting the data for the interference of signals generated by other users or from different electronic devices, and a method for receiving data in a human body communication system. The receiver and the method for receiving data in a human body communication system may be useful to stably transmit/receive data without any reduction of its transmission rate by reducing the distortion in channels and the signal noise which are caused in the use of one receiver. | 05-24-2012 |
20120163419 | GNSS Signal Processing to Estimate MW Biases - Methods and apparatus are described for processing a set of GNSS signal data derived from code observations and carrier-phase observations at multiple receivers of GNSS signals of multiple satellites over multiple epochs, the GNSS signals having at least two carrier frequencies, comprising: forming an MW (Melbourne-Wübbena) combination per receiver-satellite pairing at each epoch to obtain a MW data set per epoch, and estimating from the MW data set per epoch an MW bias per satellite which may vary from epoch to epoch, and a set of WL (widelane) ambiguities, each WL ambiguity corresponding to one of a receiver-satellite link and a satellite-receiver-satellite link, wherein the MW bias per satellite is modeled as one of (i) a single estimation parameter and (ii) an estimated offset plus harmonic variations with estimated amplitudes. | 06-28-2012 |
20120163420 | Load Estimation in Wireless Communication - A method for noise rise estimation in a wireless communication system comprises measuring ( | 06-28-2012 |
20120183018 | METHOD AND APPARATUS FOR EQUALIZING CDMA SYSTEM - A minimum mean square error (MMSE) equalizer corresponding to a plurality of receive antennas is generated using (i) channel information for a first plurality of users including a desired user, (ii) a ratio of white noise power to noise power due to code division multiple access (CDMA) signals corresponding to the first plurality of users, (iii) channel information for a second plurality of users served by another base station, and (iv) a ratio of noise power due to CDMA signals corresponding to the second plurality of users to noise power due to CDMA signals corresponding to the first plurality of users. CDMA signals received by a plurality of antennas are filtered using the MMSE equalizer. The CDMA signals are despread using a spread code corresponding to the desired user. | 07-19-2012 |
20120281731 | METHOD AND DEVICE FOR MAINTAINING THE PERFORMANCE QUALITY OF A COMMUNICATION SYSTEM IN THE PRESENCE OF NARROW BAND INTERFERENCE - A system that incorporates teachings of the subject disclosure may include, for example, a method for analyzing a wide frequency band with respect to signal power levels in specified narrow frequency bands, detecting narrow band signal power levels received in the specified narrow frequency bands, determining an average composite wideband power level from the narrow band signal power levels, determining an adaptive threshold, detecting narrow band interference according to one of the average composite wideband power level, the adaptive threshold, or both, prioritizing the detected narrow band interference, and selectively filtering a portion of the detected narrow band interference according to the prioritization. Other embodiments are disclosed. | 11-08-2012 |
20120314732 | Method and System for Single Antenna Receiver System for WCDMA - A receiver receives multipath signals in a W-CDMA system. Channel estimates and timing reference signals are generated utilizing the received multipath signals. Timing correction signals indicating a location of the received multipath signals may be generated and the received multipath signals may be combined based on the computed channel estimates and/or the generated timing reference signals. The multipath signals may be combined as a signal cluster. Circuitry may be provided that computes channel estimates based on at least one of a plurality of received multipath signals, and generates timing reference signals indicating a location of at least one of the plurality of received multipath signals. Circuitry may also be provided that combines at least a portion of the plurality of received multipath signals based on at least a portion of the computed channel estimates and/or the generated timing reference signals. | 12-13-2012 |
20130034124 | SATELLITE PAYLOAD FOR AUGMENTATION SYSTEMS - A payload for augmentation satellite comprising an input channel suitable for receiving navigation signals transmitted by at least one navigation land earth station in a first frequency band and a plurality of output channels, each suitable for broadcasting navigation signals in a frequency band different from said first band and from other broadcasting bands, characterized in that it also comprises a navigation processor. A satellite comprising such a payload and an augmentation system comprising such a satellite is also provided. | 02-07-2013 |
20130083826 | SPREADING DATA SYMBOLS AMONG MULTIPLE LAYERS IN A MIMO TRANSMISSION SCHEME - According to one embodiment, a method includes encoding a bit stream into a plurality of codewords. For each codeword of the plurality of codewords, a plurality of data symbols that represent the respective codeword are generated. Each data symbol of the respective codeword encodes one or more bits of the respective codeword into one or more modulation characteristics of a carrier wave. The method further includes spreading, by one or more processors, each data symbol of at least a subset of at least one codeword of the plurality of codewords among a plurality of layers such that each layer includes a portion of the respective data symbol. Information indicated by the plurality of layers is transmitted to an transceiver. | 04-04-2013 |
20130107910 | Method And System For Repurposing Of A Global Navigation Satellite System Receiver For Receiving Low-Earth Orbit Communication Satellite Signals | 05-02-2013 |
20130107911 | INTERFERENCE SUPPRESSING OFDM SYSTEM FOR WIRELESS COMMUNICATIONS | 05-02-2013 |
20130128928 | CANCELLATION OF PILOT AND TRAFFIC SIGNALS - A method for removing selected signals from a received signal prior to decoding begins by receiving communication signals from a transmitter over a CDMA air interface. The received communication signals are input to a traffic signal cancellation system for canceling unwanted traffic signals, thereby producing an output (O). The received communication signals are input to a pilot signal cancellation system for removing a global pilot signal, thereby producing an output (O | 05-23-2013 |
20130182746 | Reduced Complexity Channel Estimation for Uplink Receiver - The present invention proposes an LTE eNodeB receiver channel estimation technique that is referred to as reduced complexity minimum mean squared error (MMSE) technique for channel estimation. From the invention's assumptions, estimations and modified calculations, the present invention generates precise channel estimates of RS using the reduced complexity MMSE matrix and previously computed LS channel estimates H | 07-18-2013 |
20130235906 | Electronic Device with Dynamic Noise Spectrum Control - An electronic device may contain clock circuits, transmitters, and other circuits that serve as sources of noise signals. The noise signals may be characterized by a noise spectrum. The noise spectrum produced by a noise source can be adjusted by adjusting spread spectrum clock circuitry in a clock circuit, by adjusting data scrambling circuitry in a transmitter circuit, or by making other dynamic adjustments to the circuitry of the electronic device. During operation of the electronic device, sensitive circuitry in the device such as wireless receiver circuitry may be adversely affected by the presence of noise from a noise source in the device. Based on information such as which receiver bands and/or channels are being actively received and target sensitivity levels for the receiver circuitry, control circuitry within the electronic device can determine in real time how to minimize interference between the noise source and the wireless receiver circuitry. | 09-12-2013 |
20130243041 | METHOD OF BLIND ESTIMATION OF A SCRAMBLING CODE OF A WCDMA UPLINK - A method for estimating a scrambling code used on an uplink of a WCDMA system. The scrambling code is obtained from a Gold code, sum of a first specific M-sequence of the user and of a second M-sequence known from the receiver. After sampling of the signal received at the chip frequency of the scrambling code the successive samples are subject to a differential treatment and the sequence of differential values is multiplied by the second M-sequence. The observables thereby obtained are decoded with the aid of a belief propagation iterative decoding. The decoded values then serve to determine the content of the shift register of the generator of the first M-sequence. One then deduces therefrom the Gold code and an estimation of the scrambling code, Ĉ. | 09-19-2013 |
20130266043 | SIGNAL DETECTION IN NOISE - A method of detecting a transmission. The method comprises: measuring, from a first portion of a received spread-spectrum signal, a first code-phase of a spreading-code; measuring, from a second portion of the signal, a second code-phase of the spreading-code; comparing the first and second code-phases; and detecting whether the transmission is present according to the result of the comparison. Also disclosed are corresponding methods and apparatus for transmission and reception of signals. | 10-10-2013 |
20130287064 | METHOD AND DEVICE FOR TRANSMITTING/RECEIVING DOWNLINK REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM - The present invention relates to a wireless communication system, and discloses a method and a device for transmitting/receiving a downlink reference signal in a wireless communication system. The present invention provides a way for maintaining orthogonality of a reference signal between cells in a multi-cell operation. | 10-31-2013 |
20130294482 | Method and Device for Eliminating Interference in Mobile Communication System - The present invention relates to the field of communication technology, and provides a method and a device for eliminating interference in a mobile communication system. The method comprises: step 1: re-constructing signal estimation {circumflex over (d)} | 11-07-2013 |
20130336367 | SPREAD SPECTRUM SIGNALS IN VEHICLE NETWORK SYSTEMS - Systems and methods for creating an alternative parallel wireless link communication in addition to wireless signals for a vehicle network. Embodiments of the present invention provide a spread spectrum transmission module that transmits a spread spectrum signal to a wayside equipment module in which such spread spectrum signal is reflected and communicated to a transmission module through an uplink communication. The uplink communication includes a first signal received from the wayside equipment module and the spread spectrum signal. | 12-19-2013 |
20130336368 | RECEIVER - Disclosed herein is a receiver including: a first mixer adapted to mix satellite signals from first and second satellites and a first local oscillation signal so as to convert a carrier frequency of the satellite signals into a lower first intermediate frequency; a second mixer adapted to mix a satellite signal of the second satellite frequency-converted by the first mixer and a second local oscillation signal so as to convert the first intermediate frequency of the frequency-converted satellite signal from the second satellite into an even lower second intermediate frequency; and a first frequency divider adapted to generate the second local oscillation signal by dividing a frequency of the first local oscillation signal. | 12-19-2013 |
20140029645 | CHANNEL ESTIMATION FOR LOW-OVERHEAD COMMUNICATION IN A NETWORK - A receiving station receives an orthogonal frequency division multiplexing (OFDM) symbol via a shared medium, the OFDM symbol comprising a first set of frequency components modulated with preamble information and a second set of frequency components modulated with information. The receiving station processes sampled values of the received OFDM symbol based on channel characteristics estimated from the first set of frequency components to decode information encoded on a first subset of the second set of frequency components. The receiving station processes sampled values from the first symbol based on channel characteristics estimated from the first set of frequency components and the first subset of the second set of frequency components to decode information encoded on a second subset of the second set of frequency components. | 01-30-2014 |
20140036965 | SELECTION OF TRAINING SEQUENCES FOR MULTIPLE-IN MULTIPLE-OUT TRANSMISSIONS - A cellular communication system comprises a Multiple-In Multiple-Out (MIMO) transmitter and receiver. The MIMO transmitter comprises a message generator for generating MIMO messages comprising selected training sequences and transceivers transmitting the messages on a plurality of antennas. The training sequences are selected by a midamble selector from a set of training sequences in response to an associated antenna on which the message is to be transmitted. The set of training sequences is associated with the cell of the MIMO transmitter and comprises disjoint subsets of training sequences for each of the plurality of antennas. The receiver comprises a transmit antenna detector which determines which antenna of the MIMO transmitter the message is transmitted from in response to the training sequence of the received message. | 02-06-2014 |
20140044153 | APPARATUS AND METHOD FOR PILOT ESTIMATION - Methods and apparatus for wireless communication in a wireless communication network that includes receiving a synchronization channel (SCH) signal (including a primary synchronization channel (PSCH) signal, a secondary synchronization channel (SSCH) signal, and a primary scrambling code (PCH) signal) and a part of a common pilot channel (CPICH) signal in the same portion of the slot of the frame. The aspects include determining and summing the PSCH signal, SSCH signal, and PCH signal corresponding to the portion of the slot of the frame. The aspects also include de-spreading the pilot symbol over the portion of the slot of the frame based on the summed PSCH signal, the SSCH signal, and the PCH signal and estimating an estimated pilot symbol for the portion of the slot of the frame, where the estimated pilot symbol is a sum of the de-spread PSCH signal, de-spread SSCH signal, and de-spread PCH signal. | 02-13-2014 |
20140119409 | METHOD FOR LOCATING A TERMINAL AT THE SURFACE OF A COVERAGE AREA BY MEANS OF A TELECOMMUNICATION NETWORK USING A MULTI-BEAM SATELLITE - A method for locating a terminal in a coverage area using a telecommunication network, the network including a multi-beam satellite, the area including various cells, each associated with a beam for linking to the satellite to which a frequency band is assigned, the method including: performing the uplink transmission of a message incorporated into a modulated signal to the satellite at a frequency shared by three different uplink beams such that the message is received by the satellite with three different amplitudes; performing the downlink transmission of three modulated signals incorporating the message, the first, second, and third signals each corresponding to a different beam from among the three beams; receiving the first, second, and third signals; determining the amplitudes of the message within the first, second and third signals; and determining the location of the terminal from the amplitudes of the message within the first, second, and third signals. | 05-01-2014 |
20140161155 | SYSTEM AND METHOD FOR A BROADCAST RECOVERY CARRIER CHANNEL FOR STATIC AND DYNAMIC CARRIER SYSTEMS - A method of providing a recovery channel for a common transmission network of remote devices comprising encoding data that contains information about a primary carrier signal, modulating the encoded information, spreading, the modulated encoded information such that a secondary carrier signal results, combining, the spread secondary carrier with the primary carrier signal such that the spread secondary carrier signal occupies at least a portion of a bandwidth of the bandwidth pool, transmitting the combined primary and secondary carrier signals across a communications link having a plurality of remote carrier signals also being transmitted across the communications link to a remote receiver and sharing a same bandwidth pool (or multiple bandwidth pools), and reestablishing the communications link with the primary carrier signal after a loss of the communications link using the information about the primary carrier signal contained in the secondary carrier signal to recover one or more network configuration parameters. | 06-12-2014 |
20140169408 | System and Method for Open-Loop MIMO Communications in a SCMA Communications System - A method for transmitting data includes mapping a first coded information bit stream intended for a first transmit antenna onto at least one first spreading sequence of a plurality of first spreading sequences to generate a first data stream, mapping a second coded information bit stream intended for a second transmit antenna onto at least one second spreading sequence of a plurality of second spreading sequences to generate a second data stream. The method also includes transmitting the first data stream and the second data stream on respective transmit antennas. | 06-19-2014 |
20140204982 | SPREADING SEQUENCE SELECTION - A method for transmitting communications by a transmitter includes selecting a non-alternating spreading sequence, receiving bits for transmission, encoding the bits using the non-alternating spreading sequence to obtain encoded bits, and transmitting the encoded bits to a frequency shift key (FSK) receiver. A method for receiving communications by an FSK receiver includes receiving, by the FSK receiver, encoded bits from a transmitter, decoding the encoded bits using a non-alternating spreading sequence to obtain decoded bits, and processing the decoded bits. | 07-24-2014 |
20140348211 | SYSTEMS/METHODS OF ADAPTIVELY VARYING A SPECTRAL CONTENT OF COMMUNICATIONS - A spectral content of a baseband waveform is varied and a measure of the baseband waveform whose spectral content has been varied is used by a transmitter in order to convey information. According to embodiments of inventive concepts, a set of frequencies that is used to provide spectral content to the baseband waveform is varied. In some embodiments, the spectral content comprises non-contiguous first and second frequency intervals wherein a third frequency interval that is between the first and second frequency intervals remains substantially devoid of providing spectral content in order to reduce or avoid interference. In other embodiments, the spectral content that is varied comprises a bandwidth that is varied. The inventive concepts are relevant to 4G LTE carrier aggregation systems/methods and/or other aspects of 4G LTE. Various transmitter/receiver embodiments are disclosed including direct synthesis transmitter/receiver embodiments. | 11-27-2014 |
20140369389 | Cellular-to-GNSS Fine Time Assistance and Power Amplifier (PA) Blanking - Systems and methods for providing Fine Time Assistance (FTA) and Power Amplifier (PA) Blanking to a Global Navigation Satellite System (GNSS) module are provided. In an embodiment, FTA is provided in a communications device having a GNSS module and a cellular communications module, where the cellular communications module is configured to receive a reference time, transmit a pulse to the GNSS module at a pulse generation time, and provide a compensated reference time based on the pulse generation time to the GNSS module. In another embodiment, PA blanking is provided in a communications device having a GNSS module and a cellular communications module, where the cellular communications module is configured to transmit a pulse to the GNSS module to signal a high cellular-to-GNSS interference time period. | 12-18-2014 |
20150016490 | METHOD AND APPARATUS FOR SELECTIVELY APPLYING INTERFERENCE CANCELLATION IN SPREAD SPECTRUM SYSTEMS - The present invention is directed to the selective provision of interference canceled signal streams to demodulating fingers in a communication receiver. According to the present invention, potential interferer signal paths are identified. Signal streams having one or more potential interferer signals removed or canceled are created, and a correlation is performed to determine whether the strength of a desired signal path increased as a result. If the correlation indicates that the strength of a desired signal path was increased by the signal cancellation, the interference canceled signal stream is provided to the demodulation finger assigned to track the desired signal path. If the correlation determines that the strength of the desired signal path did not increase as a result of performing interference cancellation, the raw or a different interference canceled signal stream is provided to the demodulation finger. | 01-15-2015 |
20150341146 | HYBRID AUTOMATIC REPEAT REQUEST WITH FEEDBACK DEPENDENT BIT SELECTION - A multi-bit HARQ feedback is transmitted by a receiver to a transmitter. The multi-bit feedback is a function of a level of convergence reached by a decoder when the previously transmitted coded data bits bit were decoded. The transmitter is configured to select a set of coded data bits for a retransmission as a function of the multi-bit feedback. In some embodiments, different redundancy versions of the coded data bits may be selected as a function of the multi-bit feedback. In other embodiments, a bit puncturing or bit repetition pattern may be selected as a function of the multi-bit feedback. | 11-26-2015 |
20160080029 | METHOD AND APPARATUS FOR TRANSMITTING DATA STREAMS IN MIMO SYSTEM - A method for transmitting data streams in a multiple input multiple output (MIMO) system is provided, where each data stream is mapped to multiple layers in an MIMO channel space for transmission, and the method includes: performing inter-layer interleaving for N data streams to obtain N interleaved data streams; mapping the N interleaved data streams respectively to N layers in the MIMO channel space, and transmitting the N interleaved data streams that are mapped to the N layers. By using the method of the present invention, a combined CQI can be used in a better way to improve MIMO transmission performance. Further, an impact of inter-layer interference is canceled by using an interference cancellation technology (for example, an SIC technology) based on the inter-layer interleaving. | 03-17-2016 |
20160156382 | SYSTEMS AND METHODS FOR SIGNAL PROCESSING USING POWER SPECTRAL DENSITY SHAPE | 06-02-2016 |
20160191115 | USER APPARATUS, BASE STATION, SUCCESSIVE INTERFERENCE CANCELING PROCESS METHOD, AND SUCCESSIVE INTERFERENCE CANCELING CONTROL METHOD - A user apparatus for use in a radio communication system, including: an successive interference cancelling reception unit configured to obtain a desired signal by successively canceling an interference signal that becomes interference to the desired signal from a received signal that the user apparatus receives; and an ordering determination unit configured to determine an order of interference signals to be successively canceled by the successive interference cancelling reception unit, wherein the ordering determination unit determines the order based on reception quality for each interference signal. | 06-30-2016 |
20160191116 | METHOD AND APPARATUS FOR SELECTIVELY APPLYING INTERFERENCE CANCELLATION IN SPREAD SPECTRUM SYSTEMS - The present invention is directed to the selective provision of interference canceled signal streams to demodulating fingers in a communication receiver. According to the present invention, potential interferer signal paths are identified. Signal streams having one or more potential interferer signals removed or canceled are created, and a correlation is performed to determine whether the strength of a desired signal path increased as a result. If the correlation indicates that the strength of a desired signal path was increased by the signal cancellation, the interference canceled signal stream is provided to the demodulation finger assigned to track the desired signal path. If the correlation determines that the strength of the desired signal path did not increase as a result of performing interference cancellation, the raw or a different interference canceled signal stream is provided to the demodulation finger. | 06-30-2016 |
20190149188 | SPREADING A RESPONSE SIGNAL USING A FIRST SET OF ORTHOGONAL SEQUENCES AND A REFERENCE SIGNAL USING A SECOND SET OF SHORTER ORTHOGONAL SEQUENCES | 05-16-2019 |