中文说明：QPSK在AWGN信道下的仿真，实现qpskB方式下的星座图和经过AWGN信道下的星座图，计算理论误码率，并与仿真的误码率进行比较。
English Description：
QPSK in AWGN channel simulation, the realization of qpskb mode constellation and through the AWGN channel constellation, calculate the theoretical bit error rate, and compare with the simulation bit error rate.