Transmit power imbalance reduction method and nonlinear companding transform for beamforming OFDM systems

被引：1

作者：

Taroda, Satoshi ^{[1
]}

Tezuka, Ken ^{[1
]}

Higuchi, Shoichi ^{[1
]}

Ahn, Chang-Jun ^{[1
]}

Maruta, Kazuki ^{[1
]}

机构：

[1] Chiba Univ, Grad Sch Engn, Inage Ku, 1-33 Yayoi Cho, Chiba 2638522, Japan

来源：

ICT EXPRESS | 2019年 / 5卷 / 04期

关键词：

Beamforming; PAPR reduction; Power imbalance; 5G; SIGNALS;

D O I：

10.1016/j.icte.2018.03.004

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

Due to large peak-to-average power ratio (PAPR) at the time domain OFDM signal, various peak signal reduction methods for OFDM systems have been proposed. However, in a transmit OFDM beamforming, multiplication of the transmit signal using the weights causes transmit power imbalance between antennas and increases peak signal. We propose two approaches to mitigate these problems. Adding the pseudo-noise to covariance matrix at the process of weight calculation can alleviate the transmit power imbalance. Furthermore, the companding transform of time domain signal can reduce the peak signals. We show details of proposed methods and evaluate PAPR and BER performance. (C) 2019 The Korean Institute of Communications and Information Sciences (KICS). Publishing services by Elsevier B.V.

引用

页码：261 / 265

页数：5

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