4--Consider the following multiple-input single-output (MISO) wireless communication system. CSI is available at Tx and Rx. 6. Rayleigh flat fading channel is considered. The channel from each transmit antenna to the receive antenna is statistically independent fading. BPSK or QPSK is used. Can we get any benefit from the multiple transmit antennas and the CSIT? Please illustrate the transmission process and do simulations in Matlab: 6.1 please show the simulation result of BER vs SNR. Compare the BER with the BER in 5.1 under the same simulation parameters. what can you find out from this exercise?