基于协作通信技术的无线再生中继网络中的功率最优分配

摘要

针对无线再生中继网络的系统性能与系统误帧率、中断概率等有关问题,以协作通信技术中的多用户协作分集协议MDP(Multi-user Diversity-cooperative Protocol)为基础,设计了新型的MDPTS(Multi-user Diversity-cooperative Protocol Transmission Scheme)传输方案,优化了信号传输过程,提升了信号传输效率与网络吞吐量.在此基础上以系统误帧率最小为目标,提出了在发射端和中继器间的功率分配方案,以误帧率下届为目标函数,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,因此系统性能也更好.%Aiming at all related issues between system performance of wireless regenerative relaying networks and system frame error probability, outage probability, based on the Multi-user Diversity-cooperative Protocol(MDP) of cooperative communication technology, a new type of transmission scheme(MDPTS) was designed, which optimizes the signal transmission process and enhances both signal transmission efficiency and network throughput. On this basis, the minimum SFEP(System Frame Error Probability) was set as target, and the optimal power allocation scheme between the source and the relay was proposed, the optimal solution of system power allocation was obtained by Lagrange multiplier method. Simulation results show that compared with the network using traditional transmission scheme, the network adopting MDPTS possesses higher diversity gain and multiplexing gain, therefore, has better system performance.