2--Consider the following single-input multiple-output (SIMO) wireless communication system. CSI is available at Rx but not at Tx. 4. Rayleigh flat fading channel is considered. Each receiver antenna experiences statistically independent fading, and independent AWGN. BPSK or QPSK is used. Can we get any benefit from the multiple receive antennas? Please illustrate the transmission process and do simulations in Matlab: 4.1 please show the simulation result of BER vs SNR. Compare the BER with the single-receive-antenna case under the same simulation parameters. what can you find out from this exercise?