信道均衡的MATLAB程例，是一个很好的例子，对于做通信信道仿真研究的就有较高的参考和使用价值。(In this example we have a typical channel equalization scenario. We want　　
to estimate the transmitted sequence with 4-QAM symbols. In　　　　　　　　　
order to accomplish this task we use an adaptive filter with N coefficients　
The procedure is:　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　
1)　Apply the originally transmitted signal distorted by the channel plus　　
　environment noise as the input signal to an adaptive filter.　　　　　　　　
　In this case, the transmitted signal is a random sequence with 4-QAM　　　
　symbols and unit variance. The channel is a multipath complex-valued　　　　
　channel whose impulse response is h = [1.1+j*0.5, 0.1-j*0.3, -0.2-j*0.1]^T　
　In addition, the environment noise is AWGN with zero mean and　　　　　　　
　variance 10^(-2.5).　　　　　　　　　　　　　　　　　　　　　　　　　　　　
2)　Choose an adaptive filtering algorithm to govern the rules of coefficient
　updating.)