Joint Decoding of LDPC Code and Phase Factors for OFDM Systems With PTS PAPR Reduction
Joint Decoding of LDPC Code and Phase Factors for OFDM Systems With PTS PAPR Reduction
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DOI：
10.1109/tvt.2012.2222455
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发表时间：
2013
影响因子：
6.8
通讯作者：
Li Li-Li;Daiming Qu
中科院分区：
文献类型：
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作者：
Li Li-Li;Daiming Qu
在本文中，我们研究了一种低密度奇偶校验（LDPC）编码的正交频分复用（OFDM）系统的峰均功率比（PAPR）降低使用部分发送序列（PTS），它不发送PTS边信息的相位因子。我们将PTS处理看作是一个编码阶段，并将LDPC编码和PTS处理的结果码称为级联LDPC-PTS码。然后，我们推导出级联LDPC-PTS码的奇偶校验矩阵。利用奇偶校验矩阵，可以使用置信传播算法来联合解码LDPC码和相位因子。所提出的方案既不需要传输PTS边信息（相位因子），也不需要在解码之前进行相位因子估计。仿真结果表明，所提出的联合解码提供了几乎完美的相位因子恢复和LDPC解码的PTS分区的数量很少。
In this paper, we investigate a low-density parity-check (LDPC)-coded orthogonal frequency-division multiplexing (OFDM) system with a peak-to-average power ratio (PAPR) reduction using the partial transmit sequence (PTS), which does not transmit PTS side information about the phase factors. We view the PTS processing as a stage of coding and call the resulted code of LDPC coding and PTS processing a concatenated LDPC-PTS code. Then, we derive the parity-check matrix of the concatenated LDPC-PTS code. With the parity-check matrix, the LDPC code and phase factors can be jointly decoded using belief propagation algorithms. Neither transmission of PTS side information (phase factors) nor phase factor estimation before decoding is required by the proposed scheme. Simulation results show that the proposed joint decoding provides nearly perfect phase factor recovery and LDPC decoding for a small number of PTS partitions.