Open AccessEffect of composite channel aging on the spectral efficiency of multi‐pair massive multiple‐input multiple‐output amplify‐and‐forward relay networks
Author(s) -
Chen Yuanyuan,
Liu Chen,
Wang Hairong,
Zhu WeiPing
Publication year - 2017
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2016.1356
Subject(s) - relay , spectral efficiency , relay channel , topology (electrical circuits) , channel (broadcasting) , fading , transmission (telecommunications) , computer science , node (physics) , monte carlo method , scaling , power (physics) , mathematics , telecommunications , control theory (sociology) , physics , statistics , acoustics , quantum mechanics , combinatorics , artificial intelligence , geometry , control (management)
This study investigates the spectral efficiency of multi‐pair massive multiple‐input multiple‐output amplify‐and‐forward relay networks by considering the composite channel aging effect. The rational of this work is that the channel aging effect caused by phase noise and node movements is an inevitable practical channel impairment in time‐varying fading channels and substantially degrades the performance. The proposed model comprises multiple sources and multiple destinations, each equipped with a single antenna, which communication via a relay equipped with a very large number of antennas by employing maximal‐ratio combining/maximum‐ratio transmission. Based on this model, the authors first derive a closed‐form lower bound expression for the achievable rate of per source–destination pair. Then, by using the derived expression, they study how the transmitted powers of each source and the relay can be reduced without compromising the spectral efficiency when the number of relay antennas approaches infinity. They also discuss the effect of channel aging coefficients, including Doppler shift and phase noise increment variance, on the asymptotic spectral efficiency under different power scaling laws. Both theoretical analysis and Monte Carlo simulations disclose that the channel aging effect does not affect the power scaling laws but degrades the spectral efficiency.