TD-SCDMA系统中MUSIC算法的改进

针对MUSIC算法中直接用零特征值的个数不易确定信号空间维数的缺点,提出了利用信道冲激响应来限制信号的维数的方法.TD-SCDMA系统本身需要利用信道冲激响应来进行联合检测,因此该改进方法并不增加系统的复杂度,具有良好的工程实现性.从MUSIC谱上比较不同算法的性能,用信道冲激响应估计信号源的路径以确定信号的维数的方法比直接用门限法有更好的分辨率,同时也比直接选取最大的信号维数的方法更精确.

Improvement of MUSIC algorithm in TD-SCDMA system

To solve the problem that the dimension of the signal is difficult to choose in MUSIC algorithm referring to the zero eigenvalue, a novel method, which limits the dimension of the signal using the channel impulse, is presented. In the TD-SCDMA system, the channel impulse estimation is necessary for the joint detection, therefore the improving process does not add the complexity to system algorithm, and can be realized easily in engineering. The comparison of the performance in the MUSIC frequency between the gate method and the improved method, which estimates the various paths from the multi-signal source to confirm the dimension of signal, is provided. The result shows the latter is more appropriate in the distinguish capability; Meanwhile, the latter is more accurate in MUSIC frequency than the method, which takes advantage of the maximal dimension as much as possible.