arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1801.05095cs.ITmath.IT
收藏

基于布尔函数的极长码的删余分析

On the Analysis of Puncturing for Finite-Length Polar Codes: Boolean Function Approach

Song-Nam Hong, Dennis Hui

摘要:

本文研究了打孔对有限长度极化码的影响,其中打孔模式$\pv^{N}=(p_0,...,p_N)$被应用于长度- $N$极化码。我们首先引入两个虚拟信道来随机建模被删截(未发送)的比特,它们分别被称为{ \em无用信道模型}(UCM)和{ \em确定性信道模型}(DCM)。在每个模型下,我们推导出变量$p_0,...,p_{N-1}$中的布尔函数,该变量可以指示哪些极化通道应该携带冻结位。在此基础上,我们提出了一种有效的方法来联合优化打孔模式和信息集。在固定信息集上,证明了存在{ \em catastrophic}穿孔模式,该模式必然导致块错误,并递归地导出了它们的权值分布.然后,我们提出了两种构造方法的速率兼容(RC)极化码,确保家庭中的每个打孔模式是非灾难性的。仿真结果表明,所提出的RC极化码性能优于LTE中采用的RC Turbo码。

英文摘要:

This paper investigates the impact of puncturing on finite-length polar codes in which a puncturing pattern $\pv^{N}=(p_0,...,p_N)$ is applied to a length-$N$ polar code.. We first introduce two virtual channels to stochastically model the punctured (untransmitted) bits, which are respectively called {\em useless channel model} (UCM) and {\em deterministic channel model} (DCM). Under each model, we derive boolean functions in variables $p_0,...,p_{N-1}$ that can indicate which polarized channels should carry frozen bits. Based on this, we present an efficient method to jointly optimize a puncturing pattern and an information set. Focusing on a fixed information set, we show that there exist the so-called {\em catastrophic} puncturing patterns that will surely lead to a block error and derive their weight distributions recursively. We then propose the two construction methods of a rate-compatible (RC) polar code which ensures that each puncturing pattern in the family is non-catastrophic. Simulation results demonstrate that the proposed RC polar code outperform the RC Turbo code adopted in LTE.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑