【摘要】 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.更多还原

【Abstract】 An employment of cooperative diversity in ultra-wideband(UWB) was proposed.Then the signal-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.更多还原