Patent application number | Description | Published |
20080292025 | Low Density Parity Check (Ldpc) Code Decoder - A message-passing decoder for low-density parity-check codes (LDPC) is provided using a multi-value threshold scheme which is updated throughout the decoding iterations. In an embodiment the check node processing is implemented using the min-sum principle whereby for each corresponding row of the parity check matrix a first and a second minimum value among bit reliability values is determined. Each row of the decoder comprises one or more associative processing elements controlled by a row control element to determine the two minimum values. Each column comprises one or more associative processing elements, an input processing element, and a column control element to determine hard decision bits. The usage of processing elements to construct a decoder may reduce the gate count and decrease the interconnects used to couple the elements. | 11-27-2008 |
20090249163 | ITERATIVE DECODING OF CONCATENATED LOW-DENSITY PARITY-CHECK CODES - Techniques to perform iterative decoding of concatenated low-density parity-check codes (LDPC) are described. Iterative decoding of the concatenated code is achieved by performing T common iterations, wherein a common iteration comprises t | 10-01-2009 |
20120300645 | METHOD, APPARATUS AND SYSTEM OF MANAGING AN ENCODER OUTPUT RATE BASED UPON WIRELESS COMMUNICATION LINK FEEDBACK - Machine-readable media, methods, apparatus and system for managing an encoder output rate at least partially based upon wireless communication link feedback are described. In some embodiments, a device driver of the system may generate link information indicating quality of a wireless communication link between the system and another system, wherein the link information is generated at least partially based upon at least one of media access layer (MAC) information and physical layer information of the system. A system managing entity of the system may manage an output rate of an encoder of the system at least partially based upon the link information. | 11-29-2012 |
20140019827 | TECHNIQUES TO PERFORM FORWARD ERROR CORRECTION FOR AN ELECTRICAL BACKPLANE - Techniques to perform forward error correction for an electrical backplane are described. | 01-16-2014 |
Patent application number | Description | Published |
20080292032 | Arrangements for interference mitigation utilizing estimation - A method is disclosed for interference mitigation which can include receiving a signal having a data component, an interfering component and a time period and creating a first plurality of digitized data that represents at least a portion of the interfering component. The method can also include generating a polynomial equation that is related to the at least a portion of the interfering component and generating a second plurality of digital data that represents a data vector of the received signal. The method can further subtract the polynomial equation from the received signal to cancel at least a portion of the interfering component to provide an interference mitigated signal representing the data component. | 11-27-2008 |
20080292033 | Arrangements for acquiring and using data obtained from received interference to facilitate data recovery - In some embodiments a method is disclosed for detecting periodic interference and predicting future interference times. The method can include detecting an arrival time of a first occurrence of interference and detecting an arrival time of a second occurrence of interference. The method can include transmitting preemptive interference mitigation control signals that anticipate future arrival times of interference. A system is disclosed that includes a periodicity detector, an interference profiler and a mitigation control module. The system can provide interference mitigation features to a data recovery system. Other embodiments are disclosed. | 11-27-2008 |
20080292034 | Arrangements for interference mitigation utilizing recursive estimation - A method is disclosed that includes receiving a signal having a data vector component and an interfering component and creating a first set of digitized data that represents the interfering component. The method can also generate a polynomial equation based on the first set of digitized data and generate a second set of digitized data that represents a data vector component of the received signal. The polynomial equation can be subtracted from the received signal to cancel at least a portion of the interfering component and provide an interference mitigated signal representing the data vector component. An error in the interference mitigated signal can be determined and the interference mitigated component can be recalculated based on the error. Other embodiments are also disclosed. | 11-27-2008 |
20080299932 | Arrangements for narrow band interference detection - A method is disclosed for mitigating narrowband interference within a system for wideband communications. The method can include separating a wideband signal into a plurality of sub bands, detecting energy levels in the sub-bands, and activating a control signal if the energy levels of the sub-bands differ by a predetermined amount. Such a difference in energy levels can indicate that narrowband interference is present and interference mitigation features can be activated. In another embodiment, a system is disclosed that has a band splitter and a plurality of energy level detectors to detect energy differences in the sub bands. Other embodiments are also disclosed. | 12-04-2008 |
20090122897 | Method and Apparatus to Improve Performance in a Multicarrier Mimo Channel Using the Hadamard Transform - The Hadamard transform is used to spread data within data blocks in a multicarrier MIMO system, before transmission. In this manner, the negative effects caused by the clustering of bad subcarriers (i.e., subcarriers having a low transmission coefficient due to fading) may be reduced. In at least one embodiment, a MAP-type detection scheme is used in the receiver to extract bit reliabilities from the received signals. | 05-14-2009 |
Patent application number | Description | Published |
20080320362 | Multilevel Low Density Parity-Check Coded Modulation - A method and apparatus are provided for encoding and decoding a communication signal. Processes for encoding and decoding the communication signal use a first low density parity-check code (LDPC) construction and a second low density parity-check code construction that differs from the first low density parity-check code construction. Multilevel coding (MLC) is applied to protect each address bit of a signal point by an individual LDPC code. In one embodiment, the first level is coded with a progressive edge-growth LDPC code, the second level is coded with a Reed-Solomon LDPC code and the third level is left uncoded. | 12-25-2008 |
20090222711 | Generalized Multi-Threshold Decoder for Low-Density Parity Check Codes - Methods, apparatus, and systems are provided for error correction of a communication signal. A generalized multiple threshold scheme for iteratively decoding a received codeword may include generating a bit reliability based on a channel output reliability and an updated bit reliability from a previous decoding iteration, where the bit reliability is updated using a scaling factor and a comparison with a threshold. The threshold may have a plurality of threshold values during the iterative decoding. | 09-03-2009 |
20100031120 | MODIFICATION TO MEGGITT DECODER FOR BURST ERROR CORRECTION CODES - Apparatus and methods are provided to correct burst errors from a communication channel. Embodiments may include correcting burst errors in received data using a decoder configured as a Meggitt decoder with an additional selection criterion to correct a burst error having a length larger than the code error correction capability. | 02-04-2010 |
20100070825 | Fast Low-Density Parity-Check Code Encoder - Methods, apparatus, and systems are provided to encode a low-density parity-check codeword for transmission in a communications channel. In an embodiment, the encoding may include partially computing parity-check bits in response to receiving a block of message bits before obtaining all the message bits for the low-density parity-check codeword, including updating previously partially computed parity-check bits that depend on the received block. | 03-18-2010 |
20100146371 | Modified Turbo-Decoding Message-Passing Algorithm for Low-Density Parity Check Codes - Apparatus and methods arc provided to decode signals from a communication channel to reconstruct transmitted information. Embodiments may include applying a plurality of decoders to a code, in which reliability values are provided to a decoder such that the decoder receives the reliability values determined by and provided from only one other decoder of the plurality of decoders. A valid codeword may be output from application of the plurality of decoders to the code. | 06-10-2010 |
20120128104 | SPACE-TIME DECODER AND METHODS FOR DECODING ALAMOUTI-ENCODED SIGNALS IN HIGH-DOPPLER ENVIRONMENTS - Embodiments of a space-time decoder and methods for decoding Alamouti-encoded signals in high-Doppler environments are generally described herein. Other embodiments may be described and claimed. In some embodiments, soft-symbol outputs are generated from received symbols, a channel rate-of-change, and channel coefficients. Maximum-likelihood decoding may be performed to generate hard-symbol outputs from the soft-symbol outputs. | 05-24-2012 |