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介绍了变速率CDMA系统以及其相关接收机数学模型，特别描述了满足每一个符号最大信号干扰比（SIR）的线性多用户接收机。针对这种线性多用户接收机模型，提出了一种基于软件无线电技术的多用户接收机实现方案。该方案可以针对不同的QoS标准在固定速率和变速率系统之间进行切换，也可以实现变速率系统不同指标的多用户接收机之间的动态转换。
A variable rate CDMA system and its associated receiver mathematical model are introduced, and in particular, linear multiuser receivers that satisfy the maximum signal-to-interference ratio (SIR) per symbol are described. For this linear multi-user receiver model, a multi-user receiver based on software radio technology is proposed. The scheme can switch between fixed rate and variable rate systems according to different QoS standards, and also can realize the dynamic conversion among multiuser receivers with different indexes of variable rate system.