Consider a (Nt,Nr) =(4,4) MIMO channel. For the input of the channel x = [x1,x2,x3,x4] assume that each xi is drawn from a BPSK constellation with energy P. Also assume that the channel noise variance is σ2 = 1 From question 1, for the energy levels P = 0.1, 0.5, 1, 5, 10. implement the Zero-Forcing SIC detection method and find the estimate Zzf. is Zzf = x? If no declear an error.