Power allocation with DSTC for multi-user fairness in amplify-and-forward mode
Lun Tang · Jisuanji yingyong yanjiu · 2010
This paper studied the power allocation strategies based on multi-user fairness in AF wireless relay networks which apply distributed space-time coding( DSTC) . Since each user has different channel condition,the conventional power allocation strategies can not meet the need of each user’s QoS. In order to satisfy the fairness of users,first proposed the system model of the wireless relay network with AF mode,then combined with distributed linear dispersion ( LD) code,and applied the best opportunistic relaying scheme to get the highest instantaneous received SNR at user,and subject to the limited of the power of BS and RS,proposed novel power allocation schemes which maximized the worst user’s channel capacity. Since the problem was nonlinear and non-convex,the optimization problem was formulated using geometric programming ( GP) . The simulation results show clearly that,compared with the schemes of equal power allocation and proportion to channel gain,the strategie can improve the performace of the worst user,and it also can efficiently guarantee the fairness of users.