Performance analysis and code design of low-density parity-check (LDPC) coded space-time transmit diversity (STTD) system
Performance analysis and code design of low-density parity-check (LDPC) coded space-time transmit diversity (STTD) system
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DOI：
10.1109/glocom.2004.1378926
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发表时间：
2004-12
期刊：
影响因子：
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通讯作者：
A. Ohhashi;T. Ohtsuki
中科院分区：
文献类型：
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作者：
A. Ohhashi;T. Ohtsuki
空时传输分集（STTD）和空时分组码（STBC）是实现高比特率和大容量传输的重要技术。近年来，低密度奇偶校验码作为一种具有近香农极限的良好纠错码受到了广泛的关注。提出了LDPC码与STBC （LDPC-STBC）、turbo码与STBC （turbo-STBC）的串联方案。在平坦瑞利衰落信道上，LDPC-STBC的性能优于turbo-STBC。LDPC码的性能可以用密度演化（DE）来分析。本文利用DE分析了LDPC- stbc的性能，利用DE对LDPC- stbc的不规则LDPC码进行了优化，并对优化后的不规则LDPC码和规则LDPC码对LDPC- stbc的误码率性能进行了评价。数值和仿真结果表明，使用不规则LDPC码的LDPC- stbc比使用规则LDPC码的LDPC- stbc具有更好的误码率性能。
Space-time transmit diversity (STTD) and space-time block codes (STBC) are the attractive techniques for high bit-rate and high capacity transmission. Recently, low-density parity-check (LDPC) codes have attracted much attention as good error correcting codes achieving the near Shannon limit. Concatenation schemes of LDPC codes and STBC (LDPC-STBC), and turbo codes and STBC (turbo-STBC) have been proposed. The performance of the LDPC-STBC is better than that of the turbo-STBC on a flat Rayleigh fading channel. The performance of LDPC code can be analyzed by density evolution (DE). In this paper we analyze the performance of the LDPC-STBC by using DE. Also, we optimize the irregular LDPC codes for the LDPC-STBC by using DE. Furthermore, we evaluate the error rate performance of the optimized irregular LDPC codes and the regular LDPC codes for the LDPC-STBC. From the numerical and simulation results, we show that the LDPC-STBC with the irregular LDPC codes achieves better error rate performance than the LDPC-STBC with the regular LDPC codes.