说明：  1. 在matlab中，对k均值聚类算法的原理进行仿真实现； 2. 在不同信噪比下，比较接收QAM信号的星座图； 3. 对接收的星座图使用K均值算法进行均衡，比较使用算法和不使用算法直接解调的误码率。
(1.we simulate the principle of K means clustering algorithm in MATLAB. 2. the constellation diagram of receiving QAM signals is compared at different signal-to-noise ratios. 3. equalizing the received constellation using the K means algorithm, comparing the bit error rate of the algorithm and the direct demodulation without using the algorithm.)