Abstract:
The disclosure relates to a mobile communication system (100b), including: a first transmission path (110) configured to transmit a message (u) according to a first radio access technology (104); a second transmission path (111) configured to transmit the message (u) according to a second radio access technology (105); and an encoder (101) configured to encode the message (u) by a code before transmission of the message (u) over the first transmission path (110) and the second transmission path (111), wherein the code comprises at least two subcodes (c1, c2), and wherein the encoder (101) is configured to encode the message (u) intended for transmission over the first transmission path (110) with a first subcode (c1) of the at least two subcodes (c1, c2) and to encode the message (u) intended for transmission over the second transmission path (111) with a second subcode (c2) of the at least two subcodes (c1, c2).
Abstract:
A transmitter is provided. The transmitter includes: a Low Density Parity Check (LDPC) encoder configured to encode outer-encoded bits to generate an LDPC codeword including LDPC information bits and parity bits; a puncturer configured to puncture some of the parity bits included in the LDPC codeword; and a mapper configured to map the LDPC codeword except the punctured parity bits to symbols for transmission to a receiver, wherein the puncturer calculates a number of parity bits to be punctured among the parity bits included in the LDPC codeword based on a number of the outer-encoded bits, a number of the LDPC information bits, and a minimum number of parity bits to be punctured among the parity bits included in the LDPC codeword.
Abstract:
Systems and methods of transmitting includes one or more low-density parity-check (LDPC) encoders configured to adaptively encode one or more streams of input data by adjusting error correction strength based upon channel conditions. One or more mappers are configured to map one or more encoded data streams to symbols by associating bits of the symbols to points of an optimum signal constellation design (OSCD) based on one or more encoded data streams, the OSCD being decomposed into two or more sub-constellations. A spectral multiplexer is configured to combine symbol streams for the one or more encoded data streams to provide a plurality of spectral band groups. A mode multiplexer is configured to combine spectral contents of the plurality of spectral band groups allocated to a plurality of spatial modes for transmission over a transmission medium.
Abstract:
Disclosed are an LDPC encoding/decoding method and a device using same. The method comprises the steps of: (a) generating an information bit sequence by selecting information bits to be encoded from among a group of information bits; (b) generating a modified information bit sequence by inserting a preset error floor prevention bit into at least one preset position in the information bit sequence; (c) generating a parity check bit on the basis of the modified information bit sequence; and (d) performing encoding using the modified information bit sequence and the parity check bit. According to the disclosed method, performance degradation of LDPC encoding and decoding due to an error floor phenomenon can be prevented.
Abstract:
LDPC 부호화, 복호화 방법 및 그 방법을 이용하는 장치가 개시된다. 개시된 방법은 전체 정보 비트로부터 부호화할 정보 비트들을 선택하여 정보 비트 시퀀스를 생성하는 단계(a); 상기 정보 비트 시퀀스의 미리 설정된 적어도 하나의 위치에 미리 설정된 오류 마루 방지 비트를 삽입하여 수정 정보 비트 시퀀스를 생성하는 단계(b); 상기 수정 정보 비트 시퀀스에 기초하여 패리티 검사 비트를 생성하는 단계(c); 및 상기 수정 정보 비트 시퀀스 및 상기 패리티 검사 비트를 이용하여 부호화하는 단계(d)를 포함한다. 개시된 방법에 의하면, LDPC 부호화 및 복호화에서 오류 마루 현상으로 인한 성능 저하를 방지할 수 있는 장점이 있다
Abstract:
A method and apparatus for transmitting in a communication/broadcasting system is provided. The method includes determining to use an additional parity technique, generating an Nth parity check matrix, where N is an integer, performing Low Density Parity Check (LDPC) encoding using the Nth parity-check matrix, modulating a codeword corresponding to the Nth parity-check matrix, and transmitting the modulated codeword.
Abstract:
The invention relates to low density parity check decoding. A method for decoding an encoded data block is described. Encoded data block comprising data sub-blocks are stored. Decoding is performed in a pipelined manner using an irregular, block- structured parity check matrix, where at least two data sub-block matrices of the parity check matrix are read from and written in each of a plurality of clock cycles. The reading and writing of the data sub-blocks is evenly distributed between at least two area of a memory. The decoding is performed with shift values which eliminate cycles at or below a predetermined threshold length. An apparatus, computer program product and device are also described.
Abstract:
The invention relates to a circuit (4), comprising: - first and second random access memory areas (41, 42) in which a polynomial is defined by metrics; - a first multiplier (49) multiplying a polynomial of the first area (41) by a monomial; - a module (44) exhibiting: - a buffer memory (45) receiving metrics of amplitude equal to the difference between metrics of the second area and the metrics provided by the first multiplier for each first non-zero coefficient (p,j), or receiving metrics of amplitude equal to the metrics of the second area for the other associated non-zero coefficients: - an operator (46) generating extrinsic metrics; - a circuit adding together the extrinsic metrics and the metrics of the buffer memory; - a second multiplier (51) carrying out the inverse operation to that carried out by the first multiplier (49) on the metrics provided by the addition circuit; - a module aggregating the polynomials of the second multiplier (51).