Class / Patent application number | Description | Number of patent applications / Date published |
370215000 | PHASE MODULATION | 8 |
20090147669 | CONTINUOUS PHASE MODULATION ENCODER FOR WIRELESS NETWORKS - Various example embodiments are disclosed herein. According to an example embodiment, an apparatus for use in a wireless transmitter may include a phase encoder adapted to generate a continuous time signal based on a symbol and a corresponding modulation index for a current symbol interval and one or more previous symbol intervals and based on a continuous phase modulation (CPM) phase response function, a filter and symbol-rate sampler adapted to filter and then symbol rate sample the continuous time signal to generate a symbol-rate statistic that is representative of the continuous time signal for each of the symbol intervals; a mapping circuit adapted to map each of the plurality of symbol-rate statistics to a corresponding constant modulus CPM symbol, and a transmitter circuit adapted to transmit a signal based on the constant modulus CPM symbols. | 06-11-2009 |
20090279422 | Single sideband and quadrature multiplexed continuous phase modulation - A class of bandwidth reduction techniques are used develop a broad class of modulation types collectively called SSB-FM. These signals can be used to construct communication systems that provide bandwidth-normalized performance gains of 10 dB or more when compared to popular prior art modulation methods. An aspect of the invention involves mapping trellis paths in a complex signal space onto corresponding real-valued trellis signals with desirable spectral properties. The invention can be used map continuous phase modulated (CPM) signals onto simpler amplitude-modulated trellis signals having double the channel capacity of prior art CPM signals. Multi-amplitude signaling and frequency division multiplexing may also be incorporated to further accommodate more information per symbol. | 11-12-2009 |
20130294220 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING SIGNALS - A transmission apparatus couples a first phase modulation signal for first input data and a second phase modulation signal for second input data according to a first coupling method and transmits the coupled signal, and a reception apparatus receives the coupled signal. The reception apparatus derives a signal in which a first phase modulation signal and a second phase modulation signal are coupled according to a second coupling method from a received signal and separates the first phase modulation signal and the second phase modulation signal from the received signal based on the received signal and the derived signal. Furthermore, the reception apparatus obtains the first input data by demodulating the first phase modulation signal and obtains the second input data by demodulating the second phase modulation signal. | 11-07-2013 |
20130343173 | TRANSMITTER - The invention provides a transmitter comprising two (or more) phase locked loops controlling respective oscillators, and implementing different phase modulation. Multiple phases are derived from the respective oscillators, and an edge rotator forms an output signal from a combination of the phases. The oscillators can operate at different frequencies, neither of which is an integer multiple of the other, whereas the output signals of the multiplexers of the first and second phase locked loops are closer in frequency and can be the same. This reduces the problem of pulling, with a circuit that can be implemented with low power and area and with the versatility of being digitally intensive. | 12-26-2013 |
20140328155 | INCREASED INFORMATION CARRYING CAPACITY IN AN ENHANCED GENERAL PACKET RADIO SERVICE CONTROL CHANNEL - Systems and methods for selecting modulation and encoding schemes for transmitting control information on a wireless channel. For example, a base station or access terminal may select a modulation and coding scheme for transmitting radio link or media access control messages on a radio frequency channel based on a link quality of the radio frequency channel. The radio frequency channel may be an enhanced general packet radio service control channel. Other aspects, embodiments, and features are also claimed and described. | 11-06-2014 |
20160174052 | RADIO RECEIVING DEVICE | 06-16-2016 |
20160380688 | CHANNEL ESTIMATION APPARATUS AND METHOD - A channel estimation apparatus and method are provided to ensure that a channel estimation value can correctly reflect a transmission channel status, so that an orthogonal frequency division multiplexing (OFDM)-based wireless system can correctly transmit an aggregate long frame according to the channel estimation value. The channel estimation apparatus determines a first channel estimation value, receives a first symbol group of a long frame according to the first channel estimation value, and determines a second channel estimation value according to the first symbol group, and if a difference between the first channel estimation value and the second channel estimation value is less than or equal to a first threshold, determines a third channel estimation value according to the first channel estimation value and the second channel estimation value. | 12-29-2016 |
20180026734 | DIGITAL SIGNAL PROCESSOR, TRANSMITTER, AND SYSTEM | 01-25-2018 |