摘要:
A low-density parity check (LDPC) decoder includes a memory configured to store multiple variable node LLR values in a LLR memory and multiple check nodes messages in a CN memory. The LDPC decoder also includes a saturation indicator configured to determine whether each check node of the H-matrix becomes saturated, and a multiplexer. The multiplexer is configured store an extrinsic check node value in the CN memory and updated LLR value in the LLR memory when the variable node is not saturated; and store a freeze input value in the CN memory and a freeze value in the LLR memory when the variable node is saturated.
摘要:
An apparatus and method decode LDPC code. The apparatus includes a memory and a number of LDPC processing elements. The memory is configured to receive a LDPC codeword having a length equal to a lifting factor times a base LDPC code length, wherein the lifting factor is greater than one. The number of LDPC processing elements configured to decode the LDPC codeword, wherein each of the number of LDPC processing elements decode separate portions of the LDPC codeword.
摘要:
A method constructs a family of low-density-parity-check (LDPC) codes. The method includes identifying a code rate for an LDPC code in the family, identifying a protograph for the LDPC code, and constructing a base matrix for the LDPC code. The base matrix is constructed by replacing each zero in the protograph with a ‘−1’, selecting a corresponding value for an absolute shift for each one in the protograph based on constraining a number of relative shifts per column of the LDPC code to one and increasing a size of a smallest cycle in a graph of the LDPC code, and replacing each one in the protograph with the corresponding value.
摘要:
A method constructs a family of low-density-parity-check (LDPC) codes. The method includes identifying a code rate for an LDPC code in the family, identifying a protograph for the LDPC code, and constructing a base matrix for the LDPC code. The base matrix is constructed by replacing each zero in the protograph with a ‘−1’, selecting a corresponding value for an absolute shift for each one in the protograph based on constraining a number of relative shifts per column of the LDPC code to one and increasing a size of a smallest cycle in a graph of the LDPC code, and replacing each one in the protograph with the corresponding value.
摘要:
An apparatus and method decode LDPC code. The apparatus includes a memory and a number of LDPC processing elements. The memory is configured to receive a LDPC codeword having a length equal to a lifting factor times a base LDPC code length, wherein the lifting factor is greater than one. The number of LDPC processing elements configured to decode the LDPC codeword, wherein each of the number of LDPC processing elements decode separate portions of the LDPC codeword.
摘要:
A low density parity check (LDPC) family of codes is constructed by: determining a protograph for a mother code for the LDPC family of codes. The protograph is lifted by a lifting factor to design code specific protograph for a code. The method also includes constructing a base matrix for the code. The base matrix is constructed by replacing each zero in the code specific protograph with a ‘−1’; and replacing each one in the code specific protograph with a corresponding value from the mother matrix. The LDPC code includes a codeword size of at least 1344, a plurality of information bits, and a plurality of parity bits. The LDPC code is based on a mother code of code length 672.
摘要:
A receiver for use in a wireless communications network capable of decoding encoded transmissions. The receiver comprises receive path circuitry for receiving and downconverting an incoming radio frequency (RF) signal to produce an encoded received signal; and a low-density parity check (LDPC) decoder associated with the receive path circuitry for decoding the encoded received signal. The LDPC decoder further comprises a memory for storing a parity check H matrix comprising R rows and C columns, where each element of the parity check H matrix comprises one of a shift value or a −1 value; and a plurality of processing elements for performing LDPC layered decoding, wherein at least one processing element is operable to process in the same cycle a first row and a second row of the parity check H matrix.
摘要:
A transmitter is capable of performing both Galois Field (GF) (16) and GF (256) encoding in a visual light communication system. The transmitter includes a GF (256) encoder. The transmitter also includes a first bit mapper configured to map a first number of bits to a second number of bits. The Galois Field (256) encoder is configured to receive and encode the second number of bits. The transmitter also includes a second bit mapper configured to map the second number of bits to the first number of bits. The transmitter also includes an interleaver unit that can pad bits based on a frame size and puncture the bits after interleaving and prior to transmission.
摘要:
A family of low density parity check (LDPC) codes is generated based on a mother code having a highest code rate. The low density parity check (LDPC) codes include a codeword size of at least 1344. The LDPC codes also include a plurality of parity bits in a lower triangular form. The mother code is constructed by: selecting m number of rows and n number of columns; setting maximum column weights and row weights; designing a protograph matrix based on the set column weights and row weights and selected m and n; and selecting circulant blocks based on the protograph matrix.
摘要:
A family of low density parity check (LDPC) codes is generated based on a mother code having a highest code rate. The low density parity check (LDPC) codes include a codeword size of at least 1344. The LDPC codes also include a plurality of parity bits in a lower triangular form. The mother code is constructed by: selecting m number of rows and n number of columns; setting maximum column weights and row weights; designing a protograph matrix based on the set column weights and row weights and selected m and n; and selecting circulant blocks based on the protograph matrix.