基于原模圖LDPC碼的分布式聯(lián)合信源信道編碼
doi: 10.11999/JEIT170113
基金項(xiàng)目:
福建省自然科學(xué)基金(2014J01248)，國(guó)家自然科學(xué)基金(61271241, 61671395)
Protograph LDPC Based Distributed Joint Source Channel Coding
Funds:
The Natural Science Foundation of Fujian Province (2014J01248), The National Natural Science of Foundation of China (61271241, 61671395)
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摘要: 該文提出一種基于原模圖低密度奇偶校驗(yàn)(P-LDPC)碼的分布式聯(lián)合信源信道編譯碼系統(tǒng)方案。該方案編碼端，分布式信源發(fā)送部分信息位及校驗(yàn)位以同時(shí)實(shí)現(xiàn)壓縮及糾錯(cuò)功能；譯碼端，聯(lián)合迭代信源信道譯碼的運(yùn)用進(jìn)一步發(fā)掘信源的相關(guān)性以獲得額外的編碼增益。此外，論文研究了所提方案在譯碼端未知相關(guān)性系數(shù)的譯碼算法。仿真結(jié)果表明，所提出的基于P-LDPC碼的分布式聯(lián)合信源信道編譯碼方案在外部迭代次數(shù)不大的情況可以獲得較大的性能增益，并且相關(guān)性系數(shù)在譯碼端已知和未知系統(tǒng)性能基本相當(dāng)。
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關(guān)鍵詞:
- 分布式聯(lián)合信源信道編碼 /
- 相關(guān)信源 /
- 聯(lián)合迭代譯碼 /
- 原模圖LDPC碼
Abstract: This paper proposes a Distributed Joint Source-Channel Coding (DJSCC) scheme using Protograph Low Density Parity Check (P-LDPC) code. In the proposed scheme, the distributed source encoder sends some information bits together with the parity bits to simultaneously achieve both distributed compression and channel error correction. Iterative joint decoding is introduced to further exploit the source correlation. Moreover, the proposed scheme is investigated when the correlation between sources is not known at the decoder. Simulation results indicate that the proposed DJSCC scheme can obtain relatively large additional coding gains at a relatively small number of global iterations, and the performance for unknown correlated sources is almost the same as that for known correlated sources since correlation can be estimated jointly with the iterative decoding process. -
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