中文摘要：

针对使用分布式线性弥散码的放大转发协同中继网络，提出一种基于MAC层请求发送/允许发送协议的分布式功率分配方案。此方案不需要处理中心集中处理后反馈信息，信源和各中继节点可以计算自己的优化发射功率，简单易实现。还从降低系统中断概率的角度给出了基于中继信道强度的瓶颈效应和调和平均值的两种发射功率分配算法。仿真结果表明，相比较传统的等功率分配，提出的方案充分体现了分布式线性弥散码的分集增益，不仅降低系统的中断概率，还大大改善了接收端的误码率性能，有很强的实用性。

英文摘要：

Considering the amplify-and-forward （AF） cooperative relay networks applying distributed linear dispersion codes, a simple andpracticable distributedpower allocation scheme based on Ready-to-Send （RTS）! Clear-to-Send （CTS） protocols on MAC layer was proposed. The source and all relay nodes compute their optimal transmitting power by themselves without feedback from a handling center, which is prone to implementation. Two algorithms were proposed based on bottleneck effect and harmonic mean of relay channel strength to decrease the system outage probability. The simulations show that these two algorithms proposed exploit the diversity gain of distributed linear dispersion codes, so as to not only decrease the system outage probability, but also improve the bit-error probability （BEP） performance at the destination. The scheme proposed has a very strong practicability.