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.
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 pro- tocol 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 sup- pression 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 sub- carriers 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 relay- ing system based on PLNC as compared with traditional subcarrier suppression schemes.
出处
《应用科学学报》
CAS
CSCD
北大核心
2016年第1期30-41,共12页
Journal of Applied Sciences
基金
国家自然科学基金重大研究计划项目(No.91438115)
国家自然科学基金(No.61371123
No.61301165)
中国博士后基金(No.2015T81079)
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
关键词
物理层网络编码
中继系统
子载波抑制
中继选择
physical layer network coding, relaying system, subcarrier suppression, relay selection