串行级联IRA码
Serially Concatenated IRA Codes
摘要：
针对低密度奇偶检验（LDPC）码在二进制输入加性高斯白噪声（AWGN）信道中的误码平层问题，构造了一种由两个系统的不规则重复累积（IRA）分量码通过交织器连接而成的串行级联码.交织器被设计成防止IRA码之一中的停止集错误事件传播到另一码的停止集事件。两个128比特率0.707 IRA分量码的仿真结果表明，所提出的架构实现了更低的错误平层在较高的信噪比，相比16384比特率1/2 IRA码，但在低到中等信噪比引起约2 dB的SNR损失。实验表明，信噪比的损失可以减少在较大的块长度。
英文摘要：
We address the error floor problem of low-density parity check (LDPC) codes on the binary-input additive white Gaussian noise (AWGN) channel, by constructing a serially concatenated code consisting of two systematic irregular repeat accumulate (IRA) component codes connected by an interleaver. The interleaver is designed to prevent stopping-set error events in one of the IRA codes from propagating into stopping set events of the other code. Simulations with two 128-bit rate 0.707 IRA component codes show that the proposed architecture achieves a much lower error floor at higher SNRs, compared to a 16384-bit rate 1/2 IRA code, but incurs an SNR penalty of about 2 dB at low to medium SNRs. Experiments indicate that the SNR penalty can be reduced at larger blocklengths.
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