基于协作通信技术的无线非再生中继组播网络中的功率最优分配  

Optimal Power Allocation for Wireless Multicast Networks with Non-regenerative Relaying Based on Cooperative Communication Technology

作　　者：张凯[1] 钱焕延[1] 

机构地区：[1]南京理工大学计算机科学与技术学院,江苏南京210094

出　　处：《信息与控制》2011年第3期323-330,共8页Information and Control

基　　金：国防科工委应用基础资金资助项目(JI300D004)

摘　　要：针对无线非再生中继网络中多播协作通信系统的节点功率最优分配问题,提出了一种新的基于多用户协作分集协议(multi-user diversity-cooperative protocol)的MDPTS(multi-user diversity-cooperative protocol transmission scheme)传输方案.在总功率一定时,利用分集复用增益的权衡对系统的性能进行了分析.在此基础上以系统误帧率最小为目标,提出了发射端和中继器间的功率优化分配方案,在信噪比足够大的条件下,以误帧率下界为目标函数,通过拉格朗日法求得系统的功率分配最优解.仿真结果表明,与采用传统传输方案的网络相比,采用MDPTS传输方案的网络具有更高的分集增益和复用增益上限,因此系统性能也更好.Aiming at the problem of the optimal joint power allocation for cooperative multicast communication systems in the wireless networks with non-regenerative relaying,a new transmission scheme based on the multi-user diversity-cooperative protocol（MDP） is adopted.When the total power is constant,diversity-multiplexing gain tradeoff is used to analyze system performance.Taking the minimum SFEP（system frame error probability） as target,an optimal power allocation scheme between source and relay is designed.With the lower bound of SFEP in high SNR（signal noise ratio） as the objective function,the optimal solution of system power allocation is obtained by Lagrange multiplier method.Simulation results show that compared with the network using traditional transmission scheme,the network adopting transmission scheme based on MDP possesses higher ceiling in diversity gain and multiplexing gain,therefore,has better system performance.

关 键 词：无线组播网络 协作通信技术 系统误帧率 功率优化分配 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]