Patent application number | Description | Published |
20080260015 | METHOD AND APPARATUS FOR IMPROVED HIGH-SPEED ADAPTIVE EQUALIZATION - A method and apparatus for improved high-speed adaptive equalization that may operate effectively even in systems experiencing severe interference by using one or more error generators and taking multiple samples across a bit interval. Advantageously, a preferred embodiment of the current invention may be deployed in a clockless configuration. Preferably, one or more controllable analog filters may be controlled by one or more microprocessors used to assess the error data from the error generators and to calculate the appropriate coefficients for the filters according to one or more error minimization algorithms. Preferably, the steps of sampling, assessment, calculation and coefficient setting may be done iteratively to converge to an optimum set of filter values and/or respond dynamically to signals with time-varying noise and interference characteristics. | 10-23-2008 |
20100241923 | Communication device employing LDPC (Low Density Parity Check) coding with Reed-Solomon (RS) and/or binary product coding - Communication device employing LDPC (Low Density Parity Check) coding with Reed-Solomon (RS) and/or binary product coding. An LDPC code is concatenated with a RS code or a binary product code (e.g., using row and column encoding of matrix formatted bits) thereby generating coded bits for use in generating a signal that is suitable to be launched into a communication channel. Various ECCs/FECs may be employed including a BCH (Bose and Ray-Chaudhuri, and Hocquenghem) code, a Reed-Solomon (RS) code, an LDPC (Low Density Parity Check) code, etc. and various implementations of cyclic redundancy check (CRC) may accompany the product coding and/or additional ECC/FEC employed. The redundancy of such coded signals as generated using the principles herein are in the range of approximately 20% thereby providing a significant amount of redundancy and a high coding gain. Soft decision decoding may be performed on such coded signal generated herein. | 09-23-2010 |
20100241926 | Communication device employing binary product coding with selective additional Cyclic Redundancy Check (CRC) therein - Communication device employing binary product coding with selective additional cyclic redundancy check (CRC) therein. Product code encoding (e.g., employing row and column encoding of matrix formatted bits, selectively with interleaving and/or permutation of the bits therein) may be combined with additional error correction code (ECC) or forward error correction (FEC) coding thereby generating coded bits for use in generating a signal to be launched into a communication channel. Various ECCs/FECs may be employed including a BCH (Bose and Ray-Chaudhuri, and Hocquenghem) code, a Reed-Solomon (RS) code, an LDPC (Low Density Parity Check) code, etc. The redundancy of such coded signals as generated using the principles herein is in the range of approximately 7%, and hard decision decoding may be performed on such coded signals generated herein. In accordance with decoding such signals, various bit decisions (within certain iterations) may be selectively ignored and/or reverted back to previous bit decisions. | 09-23-2010 |
20110249967 | Method and System for Adaptively Setting a Transmitter Filter for a High Speed Serial Link Transmitter - A communication device may be operable to determine, in an optical module, a signal quality associated with each of one or more host transmitter filters in a host circuit. The signal quality may be communicated from the optical module to the host circuit via a management interface. The communication device may control, in the host circuit, configuration of each of the host transmitter filters based on the signal quality. The communication device may be operable to determine, in the host circuit, a signal quality associated with each of one or more module transmitter filters in the optical module. The signal quality associated with each of the module transmitter filters may be communicated from the host circuit to the optical module via the management interface. The communication device may control, in the optical module, configuration of each of the module transmitter filters based on the signal quality. | 10-13-2011 |
20120134407 | ADAPTIVE EQUALIZATION WITH GROUP DELAY - Methods, apparatuses, and systems are presented for performing adaptive equalization involving receiving a signal originating from a channel associated with inter-symbol interference, filtering the signal using a filter having a plurality of adjustable tap weights to produce a filtered signal, and adaptively updating each of the plurality of adjustable tap weights to a new value to reduce effects of inter-symbol interference, wherein each of the plurality of adjustable tap weights is adaptively updated to take into account a constraint relating to a measure of error in the filtered signal and a constraint relating to group delay associated with the filter. Each of the plurality of adjustable tap weights may be adaptively updated to drive group delay associated with the filter toward a target group delay. | 05-31-2012 |
20140053042 | Communication device employing binary product coding with selective additional Cyclic Redundancy Check (CRC) therein - Communication device employing binary product coding with selective additional cyclic redundancy check (CRC) therein. Product code encoding (e.g., employing row and column encoding of matrix formatted bits, selectively with interleaving and/or permutation of the bits therein) may be combined with additional error correction code (ECC) or forward error correction (FEC) coding thereby generating coded bits for use in generating a signal to be launched into a communication channel Various ECCs/FECs may be employed including a BCH (Bose and Ray-Chaudhuri, and Hocquenghem) code, a Reed-Solomon (RS) code, an LDPC (Low Density Parity Check) code, etc. The redundancy of such coded signals as generated using the principles herein is in the range of approximately 7%, and hard decision decoding may be performed on such coded signals generated herein. In accordance with decoding such signals, various bit decisions (within certain iterations) may be selectively ignored and/or reverted back to previous bit decisions. | 02-20-2014 |
20140169499 | OPTICAL COMMUNICATION INTERFACE UTILIZING N-DIMENSIONAL DOUBLE SQUARE QUADRATURE AMPLITUDE MODULATION - The present invention is directed to data communication system and methods. More specifically, various embodiments of the present invention provide a communication interface that is configured to transfer data at high bandwidth using nDSQ format(s) over optical communication networks. In certain embodiments, the communication interface is used by various devices, such as spine switches and leaf switches, within a spine-leaf network architecture, which allows large amount of data to be shared among servers. | 06-19-2014 |
20140169789 | OPTICAL COMMUNICATION INTERFACE UTILIZING CODED PULSE AMPLITUDE MODULATION - The present invention is directed to communication system and methods. More specifically, various embodiments of the present invention provide a communication interface that is configured to transfer data at high bandwidth using PAM format(s) over optical communication networks. In certain embodiments, the communication interface is used by various devices within a spine-leaf network architecture, which allows large amount of data to be shared among servers. | 06-19-2014 |
20150023452 | OPTICAL COMMUNICATION INTERFACE UTILIZING N-DIMENSIONAL DOUBLE SQUARE QUADRATURE AMPLITUDE MODULATION - The present invention is directed to data communication system and methods. More specifically, various embodiments of the present invention provide a communication interface that is configured to transfer data at high bandwidth using nDSQ format(s) over optical communication networks. In certain embodiments, the communication interface is used by various devices, such as spine switches and leaf switches, within a spine-leaf network architecture, which allows large amount of data to be shared among servers. | 01-22-2015 |