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介绍了应用于异步CDMA移动通信系统中的信道盲估计技术的原理,信道盲估计主要分为子空间分解、相关拟合和最大似然三种方法。分析了各自的特点,然后讨论了在部分发送数据已知条件下的半盲信道估计技术。
The principle of blind channel estimation applied in asynchronous CDMA mobile communication system is introduced. Blind channel estimation is mainly divided into three subspaces decomposition, correlation fitting and maximum likelihood. The characteristics of each are analyzed, and then the semi-blind channel estimation technique is discussed under the condition that some of the data are transmitted.