Zero-Forcing Beamforming in Multiuser MISO Downlink Systems Under Per-Antenna Power Constraint and Equal-Rate Metric

被引：34

作者：

Lee, Sang-Rim ^{[1
]}

Kim, Jin-Sung ^{[1
]}

Moon, Sung-Hyun ^{[1
]}

Kong, Han-Bae ^{[1
]}

Lee, Inkyu ^{[1
]}

机构：

[1] Korea Univ, Sch Elect Engn, Seoul, South Korea

来源：

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS | 2013年 / 12卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

Broadcast channel; zero-forcing precoding; per-antenna power constraints; GAUSSIAN BROADCAST CHANNEL; SUM-RATE CAPACITY; MIMO; COMMUNICATION; INTERFERENCE; NETWORKS; PERFORMANCE; THROUGHPUT; RECEIVERS; INVERSION;

D O I：

10.1109/TWC.2012.120312.120332

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In this paper, we analyze the average sum rate of downlink multi-antenna systems with zero-forcing beamforming (ZFBF). In practical implementations, each antenna is equipped with its own power amplifier and is limited individually by linearity of the amplifier. Thus, this paper adopts a more realistic per-antenna power constraint instead of conventional sum-power constraint on transmit antennas. To this end, we first show that a distribution of the received signal-to-noise ratio (SNR) of the ZFBF scheme with per-antenna power constraint and equal-rate metric can be approximated as a minimum of chi-square random variables. Based on this result, we present an accurate formula of the average sum rate in a closed form. Furthermore, employing extreme value theory, an expression of the asymptotic average sum rate with large numbers of transmit antennas and users is derived from the limiting distribution of the received SNR. Simulation results verify the validity of our analysis even with not so large numbers of transmit antennas and users.

引用

页码：228 / 236

页数：9

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