Patent ID: 9077377
Filing Date: 2015-07-07
Classification: H03M,H04B

Abstract:
1. A transmission device comprising: a determining unit operable to determine a low density parity check (LDPC) encoding method for use in transmission to be an LDPC encoding method corresponding to occurrence conditions of external noise from a plurality of LDPC encoding methods, each having the same code length and the same code rate and being defined by a different parity check matrix; an encoding unit operable to generate a codeword bit sequence by encoding transmission data using the LDPC encoding method determined by the determining unit; and an elimination pattern estimation unit operable to estimate an elimination pattern in accordance with occurrence conditions of external noise, the elimination pattern indicating a count of candidate elimination bits and a position within a codeword of each candidate elimination bit, a candidate elimination bit being one of a plurality of codeword bits forming a codeword bit sequence and having a high probability of being eliminated by a reception device before decoding, wherein the plurality of LDPC encoding methods includes at least a first LDPC encoding method defined by a first parity check matrix and a second LDPC encoding method defined by a second parity check matrix, a combination of a predetermined number of codeword bits forms a stopping set for the first parity check matrix and does not form a stopping set for the second parity check matrix, and the determining unit determines the LDPC encoding method for use in transmission from the plurality of LDPC encoding methods in accordance with an estimation of decoding performance for each parity check matrix, the estimation being in accordance with a relationship between the elimination pattern estimated by the elimination pattern estimation unit and the parity check matrix.