分布式无线通信系统下行功率分配策略

Downlink power allocation in distributed wireless communication systems

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。

A downlink power allocation scheme was developed to improve the spectral efficiency of distributed wireless communication systems （DWCS）. The method assumes that only the large-scale channel state information （CSI） is known at the transmitter, so the method can be easily applied in practice. Then, an optimal power allocation scheme was developed when both the large-scale CSI and the small-scale CSI are known at the transmitter. Simulations show that the capacity of this scheme is quite close to the optimal method and that the large-scale CSI has a greater effect than the small-scale CSI on the power allocation performance in DWCS, which implies that DWCS are very practicable.