Optimal Beamforming in Cognitive Two-way Relay Networks

被引：7

作者：

Alizadeh, Ardalan ^{[1
]}

Sadough, Seyed Mohammad-Sajad ^{[1
]}

Khajavi, Navid Tafaghodi ^{[1
]}

机构：

[1] Shahid Beheshti Univ, Fac Elect & Comp Engn, Dept Elect Engn, Cognit Telecommun Res Grp, Tehran 1983963113, Iran

来源：

2010 IEEE 21ST INTERNATIONAL SYMPOSIUM ON PERSONAL INDOOR AND MOBILE RADIO COMMUNICATIONS (PIMRC) | 2010年

关键词：

USER COOPERATION DIVERSITY;

D O I：

10.1109/PIMRC.2010.5671706

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：

We consider a cognitive two-way relay network which consists of two transceivers (primary users) and multiple cognitive terminals. The two transceivers transmit their data toward the cognitive terminals which sense the spectrum constantly. If the primary users are in operation, the cognitive terminals act as relay nodes by multiplying the received signal by a beamforming coefficients and then broadcasting the so-obtained signal to the transceivers. When the primary users are not in operation, the cognitive terminals communicate with a base station (BS) to increase the overall throughputs. Our aim is to optimally calculate the beamforming weight coefficients so as to minimize the total transmit power of the two transceivers and the cognitive radios subject to three constraints on the received signal-to-noise-ratios at the two transceivers and at the cognitive BS. Simulation results show that the sum-rate of the cognitive two-way relay network is increased while the total transmit power is minimized.

引用

页码：2331 / 2335

页数：5

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