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The Turbo-decoding Message-passing (TDMP) algorithm of Low-Density Parity-Check (LDPC) codes has a faster convergence speed, lower hardware implementation complexity, and less storage units than the Belief-Passing (BP) algorithms. However, because of the integer quantization operations for initial information, restriction of storage units will cause the problem of decoding information overflowing...
According to the fact that the random construction method of LDPC(Low Density Parity Check) codes are lack of structure and are difficult to be implemented in hardware, two construction methods of QC-LDPC(Quasi-Cyclic LDPC) codes-sequential and random search method based on distance graph are proposed. The two algorithms can produce flexible QC-LDPC codes by setting the parameters such as code length,...
This paper proposes a cooperation system jointing LDPC codes and OFDM modulation. Its principle is given in detail that the signal is encoded by LDPC and modulated with OFDM, moreover, transmit diversity is created when the relay station assists a sender by retransmitting its information signal to the destination. Furthermore, several simulation results are presented to validate the proposed approach...
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