中文说明：频率估计的MM算法，该算法有较好的QPSK，OQPSK，bpsk.etc。但需要时间同步算法在频率估计。这是非常重要的。我使用的算法的ZigBee接收信号，它工作得很好。
English Description：
MM algorithm for frequency estimation ,the algorithm is good for OQPSK,QPSK,BPSK.etc.But the algorithm need time synchronization before frequency estimation.it is very important.I have use the algorithm for Zigbee received signal ,it is works fine .