Asymptotic Optimality of QPSK Faster-than-Nyquist Signaling in Massive MIMO Systems

被引：1
作者：
Takeuchi, Keigo [1 ,2 ]
机构：
[1] Univ Electrocommun, Dept Commun Engn & Informat, Chofu, Tokyo 1828585, Japan
[2] Toyohashi Univ Technol, Dept Elect & Elect Informat Engn, Toyohashi, Aichi, Japan
来源：
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES | 2016年 / E99A卷 / 12期
关键词：
Faster-than-Nyquist signaling; quadrature phase-shift keying (QPSK); massive multiple-input multiple-output (MIMO); mutual information; replica method; MULTIPLE-ACCESS CHANNELS; MULTIUSER DETECTORS; SPECTRAL EFFICIENCY; CDMA; INTERFERENCE; ANTENNAS; JOINT;
D O I：
10.1587/transfun.E99.A.2192
中图分类号：
TP3 [计算技术、计算机技术];
学科分类号：
0812 ;
摘要：
Faster-than-Nyquist (FTN) signaling is investigated for quasi-static flat fading massive multiple-input multiple-output (MIMO) systems. In FTN signaling, pulse trains are sent at a symbol rate higher than the Nyquist rate to increase the transmission rate. As a result, intersymbol interference occurs inevitably for flat fading channels. This paper assesses the information-theoretically achievable rate of MIMO FTN signaling based on the optimum joint equalization and multiuser detection. The replica method developed in statistical physics is used to evaluate the achievable rate in the large-system limit, where the dimensions of input and output signals tend to infinity at the same rate. An analytical expression of the achievable rate is derived for general modulation schemes in the largesystem limit. It is shown that FTN signaling does not improve the channel capacity of massive MIMO systems, and that FTN signaling with quadrature phase-shift keying achieves the channel capacity for all signal-to-noise ratios as the symbol period tends to zero.
引用
收藏
页码：2192 / 2201
页数：10
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