通过MATLAB软件；通过仿真得出性能曲线；从而比较bpsk的性能-The bit-error rate (BER) of binary phase-shift keying

in Rayleigh fading, using the Alamouti transmission scheme and

receiver selection diversity in the presence of channel-estimation

error, is studied. Closed-form expressions for the BER of log-likelihood

ratio selection, signal-to-noise ratio (SNR) selection, switchand-

stay combining selection, and maximum ratio combining are

derived in terms of the SNR and the cross-correlation coefficient

of the channel gain and its corrupted estimate. Two new selection

schemes, space–time sum-of-squares combining selection diversity

and space–time sum-of-magnitudes selection diversity, are

proposed and proven to provide almost the same performance as

SNR selection, but with much simpler implementations. The effects

of channel-