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通过研究 CDMA系统的抗远近效应技术 ,推导了异步系统的等价同步离散时间模型 ,提出了采用自适应分数间隔接收机代替传统的相关接收机 ,并对其进行了仿真研究 ,给出了实验结果。这种接收机在只需知道接收用户的地址码 ,无需干扰用户的任何信息的条件下进行多址干扰 (MAI)抑制 ,具有抗远近效应能力。仿真研究结果表明 ,自适应接收机可以在远近效应环境中工作 ,其性能具有较大的改善 ,特别适合移动台中采用。
By studying the anti-near-far effect of CDMA system, the equivalent synchronous discrete-time model of asynchronous system is deduced. The adaptive fractional-interval receiver is proposed instead of the traditional receiver and the simulation is given. result. This receiver has MAI suppression with knowledge of the recipient’s address code and MAI without interfering with any of the user’s information and has anti-near-far effects. Simulation results show that the adaptive receiver can work in near and far effect environment, and its performance is greatly improved, especially suitable for mobile station.