Channel Estimation With Systematic Polar Codes

Channel Estimation With Systematic Polar Codes
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使用系统极化码进行信道估计

DOI:
10.1109/tvt.2018.2806364
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发表时间:
2018-01
影响因子:
6.8
通讯作者:
Li LP
Li LP
中科院分区:
计算机科学2区
文献类型:
--
作者:
Li Liping;Xu Zuzheng;Hu Yanjun;Li LP

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极性码在衰落信道中的研究对于极性码在无线通信中的应用具有重要意义。信道估计是在衰落信道中实现通信的基本步骤。系统和非系统极性码的构造都基于信息集和已知的冻结比特。存在系统和非系统极性码的有效实现。当涉及到信道估计或信道跟踪时,传统上在码字中插入额外的导频符号。为了提高极化码在有限域中的性能,本文从编码符号本身中选取导频符号。为了保持现有的极地码编码的高效结构,导频选择是关键,因为并不是所有的选择都可以重复使用现有的结构。本文提出了非均匀导频选择(UEPS)和偶数导频选择(EPS)两种导频选择算法,这两种算法在不改变有效的极坐标编码结构的前提下,提高了系统的性能。实践证明,所提出的UEPS和EPS满足高效施工条件。本文证明了EPS的性能优于UEPS和传统的导频插入方案。仿真结果验证了所提出的导频选择方案的性能。
Study of polar codes in fading channels is of great importance when applying polar codes in wireless communications. Channel estimation is a fundamental step for communication to be possible in fading channels. Construction of both systematic and nonsystematic polar codes is based on an information set and the known frozen bits. Efficient implementation of systematic and nonsystematic polar codes exists. When it comes to channel estimation or channel tracking, additional pilot symbols are inserted in the codeword traditionally. In this paper, to improve the performance of polar codes in the finite domain, pilot symbols are selected from the coded symbols themselves. In order to keep the existing efficient structure of polar code encoding, pilot selection is critical since not all selections can reuse the existing structure. In this paper, two pilot selections denoted as Uneven Pilot Selection (UEPS) and Even Pilot Selection (EPS) are proposed, which do not change the efficient polar encoding structure. The proposed UEPS and EPS are proven to satisfy the efficient construction condition. The performance of EPS is shown in this paper to outperform both the UEPS and the traditional pilot insertion scheme. The simulation results provided verify the performance of the proposed pilot selection schemes.
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