利用matlab仿真实现在不同信道下使用不同的分集算法，以及使用不同的分集数，观察信噪比和误码率的关系，得出结论，体会分级的效果-Simulation using matlab to use different channels in different sub-set algorithm, and the use of different sub-set of the number of observed signal to noise ratio and bit error rate, concluded that the effect of experience rating