（1）请推导出单径瑞利信道中的BPSK相干解调的理论误码率性能，并画出比特信噪比与误码率的关系曲线。
（2）在单径瑞利信道中，请设计一种时分的导引辅助的信道估计方法，用Simulink进行仿真，测量BPSK的误码率性能，画出比特信噪比与误码率的关系曲线，并与(1)的曲线进行对比。((1) the theoretical error rate performance of BPSK coherent demodulation in single path Rayleigh channel is derived, and the relationship curve of bit signal to noise ratio and bit error rate is drawn.
(2) in a single path Rayleigh channel, we design a time division guided channel estimation method. We use Simulink to simulate the BPSK bit error rate performance, and draw the relation curve between bit signal to noise ratio and bit error rate, and compare it with the curve of (1))