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为了提高分布式无线通信系统(DWCS)的频谱效率,提出了一种下行功率分配算法。该算法仅要求发送端确知大尺度信道状态信息,具有较低的复杂度,易于实现。为了对比该算法的性能,引入小尺度信道状态信息的影响,研究了发送端确知全部信道状态信息时的最优功率分配算法。仿真结果表明:所提算法极大地提高了DWCS系统的频谱效率;另外,在DWCS系统中大尺度信道状态信息是影响功率分配算法性能的主要因素,小尺度信道状态信息的作用不明显,这也正体现了DWCS的实用化优势。
In order to improve the spectral efficiency of distributed wireless communication system (DWCS), a downlink power allocation algorithm is proposed. The algorithm only requires the sending end to know the large-scale channel state information, which has a lower complexity and is easy to implement. In order to compare the performance of the proposed algorithm and the influence of small-scale channel state information, the optimal power allocation algorithm when the sender knows all the channel state information is studied. The simulation results show that the proposed algorithm greatly improves the spectral efficiency of DWCS system. In addition, the large-scale channel state information in DWCS system is the main factor affecting the performance of power allocation algorithm, and the effect of small-scale channel state information is not obvious Is embodies DWCS practical advantages.