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应用科学学报 >

2016 , Vol. 34 >Issue 1: 30 - 41

DOI: https://doi.org/10.3969/j.issn.0255-8297.2016.01.004

通信工程

PLNC-OFDM双向多中继系统中的联合子载波抑制与中继选择

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  • 解放军理工大学通信工程学院, 南京 210007

收稿日期: 2015-07-29

  修回日期: 2015-09-15

  网络出版日期: 2016-01-30

基金资助

国家自然科学基金重大研究计划项目(No.91438115);中国博士后基金(No.2015T81079);国家自然科学基金(No.61371123,No.61301165);江苏省自然科学基金(No.BK2011002,No.BK2012055);国家博士后科学基金(No.2014M552612);江苏省博士后科学基金(No.1401178C)资助

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Joint Subcarrier Suppression and Relay Selection for Two-Way OFDM Relaying System with PLNC

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  • College of Communications Engineering, PLA University of Science and Technology, Nanjing 210007, China

Received date: 2015-07-29

  Revised date: 2015-09-15

  Online published: 2016-01-30

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摘要

研究在多径瑞利衰落信道下采用译码转发的PLNC-OFDM双向多中继系统中联合子载波抑制与中继选择(JSSRS)问题,并提出两种JSSRS方法:固定抑制门限的JSSRS(FTJ)和固定子载波数目的JSSRS(FNS-J). FT-J在一次双向信息交换过程中采用固定的抑制门限进行子载波抑制,FNS-J在一次双向信息交换过程中保持抑制的子载波数目恒定不变,即活跃子载波数目恒定不变而抑制门限动态变化.仿真结果表明,与传统的子载波抑制相比,所提出的FT-J和FNS-J不仅增强了系统可靠性,而且提高了系统有效性.

关键词： 物理层网络编码; 中继系统; 子载波抑制; 中继选择

本文引用格式

沈先丽, 谢威, 徐友云, 许魁, 张冬梅 . PLNC-OFDM双向多中继系统中的联合子载波抑制与中继选择[J]. 应用科学学报, 2016 , 34(1) : 30 -41 . DOI: 10.3969/j.issn.0255-8297.2016.01.004

Abstract

This paper deals with the joint subcarrier suppression and relay selection (JSSRS) problem in two-way orthogonal frequency division multiplexing (OFDM) relaying system based on physical layer network coding (PLNC) with the decode-and-forward protocol over a multipath Rayleigh fading channel. Two JSSRS schemes are proposed:JSSRS with a fixed threshold (FT-J) and JSSRS with a fixed number of subcarriers (FNS-J). In a two-way information exchange process, FT-J suppresses subcarriers by keeping the suppression threshold invariant, and FNS-J suppresses subcarriers by keeping the number of suppressed subcarriers invariant. In other words, FNS-J keeps the number of active subcarriers constant and the suppression threshold value varying. Simulation results show that FT-J and FNS-J can improve efficiency and enhance reliability of a two-way OFDM relaying system based on PLNC as compared with traditional subcarrier suppression schemes.

Key words： physical layer network coding; relaying system; subcarrier suppression; relay selection

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