合作超宽带系统的资源优化分配

Resource allocation for cooperative ultra-wideband system

在将合作分集技术引入超宽带(UWB)系统的基础上,对译码前向(DF)合作的多带正交频分复用(MB-OFDM)超宽带系统进行信噪比(SNR)分析和符号错误概率(SER)性能分析,得到了该系统的平均信噪比和符号错误概率的闭式表达式.针对多带和合作的特点,对系统的资源优化分配做了讨论,提出一种次优算法,该算法主要分两步,先得到每个用户对的最优功率分配及子频带分配,再在每个用户对内进行源和中继的功率优化.仿真结果表明,该算法比固定分配算法能有效地降低发送功率.

An employment of cooperative diversity in ultra-wideband （UWB） was proposed. Then the sig- nal-to-noise ratio （SNR） and symbol error rate （SER） performance in decode-and-forward （DF） cooperative multiband orthogonal frequency division multiplexing （MB-OFDM） UWB system was analyzed and the closed-form formulation was given. An optimum allocation of subband and power was discussed according to the characteristic of multiband and cooperation. A computationally inexpensive suboptimal approach was proposed. The power was optimized and the subband was assigned for the network regarding each user pair as a user, then the power was optimized in each user pair. Simulation results show that the suboptimal approach can greatly save up the transmit power.