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空时扩频 (STS)及正交发射分集 (OTD)是cdma2 0 0 0标准提出的 2种发射分集方案 .本文在多径信道及多用户条件下对 2种方案进行了性能比较分析 .在IMT 2 0 0 0标准信道下进行了链路级仿真 .性能分析及仿真结果表明STS相对于OTD的性能增益随着传播路径的增加及用户数的降低而减少 .
Space-time spread spectrum (STS) and orthogonal transmit diversity (OTD) are two kinds of transmit diversity schemes proposed by the cdma2 0 0 0 standard.This paper compares the performance of two schemes under the condition of multipath channel and multi-user, Performance analysis and simulation results show that the performance gain of STS relative to OTD decreases with the increase of propagation path and the decrease of number of users.