基于反馈的非均衡X-Z信道量子LDPC译码

Decoding of Quantum LDPC Codes over Unbalanced X-Z Channel by Using Feedback

针对量子LDPC码,以前期所提出的反馈式和积译码算法(FSPA)为基础,考虑其在非均衡X-Z信道下的译码方法,并分析其相应的性能表现。研究表明在该信道模型下的反馈式策略依然可以借由错误图样对比,译码失败校验子的错误方式,以及信道特征分析,更加有效地调整信息节点上的概率分布,从而大幅提高和积译码器的译码能力。最后,通过实例仿真验证了上述结论。

For quantum LDPC codes widely studied recent years, the decoding strategy based on the feedback sum-product （FSPA） we proposed before is investigated for the case of unbalanced X-Z channel. And the analysis of the corresponding performance of the FSPA is given. The study shows that under the unbalanced X-Z channel model, the feedback strategy could still exploit the syndrome comparison, the error style of the frustrated checks, the chan- nel character analysis to adjust the probabilities distributions of the concerned information bits, thereby significantly improving the decoding ability of the sum-product decoder. Finally, simulation results verified our statements.