Overview of Low Power Data Link Algorithms Design for Industrial Internet——Necessity, Reality and Prospect of JSCC Design
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摘要:
原模图低密度奇偶校验(P-LDPC)码已经广泛应用于各种通信系统，为了使其能够满足不同应用场景下系统对纠错性能、硬件资源损耗以及功耗等方面的要求，需要对P-LDPC码进行进一步的设计优化。该文主要从标准信道环境下基于双P-LDPC(DP-LDPC)码的联合信源信道编码(JSCC)系统的属性研究、系统设计优化以及性能表现等角度入手，对近些年出现的针对该系统环境所做的优化分析工作进行了综述。表明进行的优化工作属实显著地改善了系统性能，为面向工业互联网(II)的LDPC码的研究工作提供些许思路。最后，该文对未来的研究工作进行了展望，为感兴趣的研究学者提供参考以继续推进。
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关键词:
- 工业互联网 /
- 低功耗 /
- 联合信源信道编码 /
- 原模图低密度奇偶校验码
Abstract:Protograph Low Density Parity Check (P-LDPC) code is widely used in various communication systems. In order to meet the requirements of error correction performance, hardware resource loss and power consumption in different application scenarios, further design optimization of P-LDPC codes is needed. This paper focuses on the properties of Joint Source-Channel Coding (JSCC) system based on Double P-LDPC (DP-LDPC) codes in standard channel environment, the optimization of code design and performance behavior, etc. The design and optimization for the system environment in recent years is summarized. It shows that the design optimization work has significantly improved the system performance, which provides some ideas for the research of Industrial Internet (II)-oriented LDPC code. Finally, the future research work is discussed for the reference and promotion of interested scholars.
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图 9 基于DP-LDPC码的JSCC系统采用不同的信道P-LDPC码的BER性能对比(
${{{B}}_{{\rm{L2}}}} \ne 0$ ,$p(1) = 0.020$ )表 1 不同信源统计特性以及不同信道编码矩阵在基于DP-LDPC码的JSCC系统下对应的译码门限值
${p_{(1)}} = 0.010$ ${p_{(1)}} = 0.015$ ${p_{(1)} } = 0.020$ BAR4JA –2.524 –1.450 –0.632 BIARA–1 –3.145 –1.984 –1.155 BAR3A –3.248 –1.910 –0.965 BIARA–2 –3.438 –2.254 –1.379 
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表 2 针对
${{{B}}_{\rm{L1}}}$ 的搜索算法(1) 给出$p(1)$, ${{{B}}_{\rm{s}}}$, ${{{B}}_{\rm{c}}}$，且有${{{B}}_{\rm{L2}}}=0$； (2) 初始化化${{{B}}_{\rm{L1}}}=0$； (3) 合并${{{B}}_{\rm{s}}}$, ${{{B}}_{\rm{c}}}$, ${{{B}}_{\rm{L1}}}$和${{{B}}_{\rm{L2}}}$，即为初始的${{{B}}_{\rm{J}}}$； (4) ${{{B}}_{{\rm{J}}\_{\rm{min}}}} \leftarrow {{{B}}_{\rm{J}}}$, $\delta \left( {{{{B}}_{{\rm{J}}\_{\rm{min}}}},p(1)} \right) \leftarrow \delta \left( {{{{B}}_{\rm{J}}},p(1)} \right)$； (5) 如果$p(1) < p{(1)^{{\rm{st}}}}$ (6) 遍历除去信道码中的预编码器的所有的链接； (7) 根据约束条件式(2)改变${{{B}}_{\rm{L1}}}$； (8) 如果$ \delta \left( {{{{B}}_{\rm{J}}},p(1)} \right) < \delta \left( {{{{B}}_{{\rm{J}}\_ {\rm{min}}}},p(1)} \right)$ (9) ${{{B}}_{{\rm{J}}\_ {\rm{min}}}} \leftarrow {{{B}}_{\rm{J}}}$, $\delta \left( {{{{B}}_{{\rm{J}}\_{\rm{min}}}},p(1)} \right) \leftarrow \delta \left( {{{{B}}_{\rm{J}}},p(1)} \right)$； (10) 输出：${{{B}}_{{\rm{J}}\_ {\rm{min}}}}$, $\delta \left( {{{{B}}_{{\rm{J}}\_ {\rm{min}}}},p(1)} \right)$
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