星型光码分多址系统中的远近效应

分析了星型拓扑结构光码分多址系统中的能量损耗,阐明了远近效应产生的主要原因。在考虑远近效应的情况下,对系统的误码率进行了理论推导和数值仿真。结果表明,目标用户和干扰用户之间的功率差越小,系统的误码率也就越高。提出几种抑制远近效应的可行方案。

Near-far effect in optical cdma star system

This paper analyzed the energy loss in optical code division multiple access(CDMA) system with star topology and introduced the cause of producing the near-far effect.The derivation and simulation of the error probability of optical CDMA system were presented,taking into account the presence of the nearfar effect.Results show that decrease of power difference between target user and interference user degrades the error probability for all users in the system.At last,some feasible means to reduce near-far effect were proposed.