MINIMIZING POWER SUM IN TWO-WAY AMPLIFY-AND-FORWARD RELAY CHANNEL

被引:0
作者
Cetin, Ebru S. [1 ]
Celebi, Mehmet E. [1 ]
机构
[1] Istanbul Tech Univ, Dept Elect & Commun Engn, Maslak, Turkey
来源
2012 IEEE 13TH INTERNATIONAL WORKSHOP ON SIGNAL PROCESSING ADVANCES IN WIRELESS COMMUNICATIONS (SPAWC) | 2012年
关键词
Amplify-and-forward; two-way relaying; total power minimization; ALLOCATION;
D O I
暂无
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
This paper considers a two-way relay network in which two source nodes exchange messages during two time slots with the help of a half-duplex amplify-and-forward relay node. Closed form expressions of source and relay node powers are obtained by solving an optimization problem which aims to minimize system total power by constraining source nodes' received signal-to-noise ratios (SNR), thus satisfying the minimum quality of service (QoS). Furthermore, the variation of optimum powers versus the parameter which gives information about the channel qualities is investigated for symmetric and asymmetric QoS at the source nodes. In addition, assuming equal channel and noise variances, the effect of variance on the proposed and equal power allocation is illustrated. Numerical results show that the optimum power allocation outperforms the equal power allocation scheme in terms of total power for various variance values and QoS demands.
引用
收藏
页码:444 / 448
页数:5
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