120 SNR R=0dB 100 25dB 60 20 6 Number of transmit antennas (=of receive antennas) (a)Capacity versus Mfor N=M,OdBsSNR<25dB Capacity of MIMO systems 国 10 5 SNR(dB) 1818 2 4 6 8 10 12 14 0 20 40 60 80 100 120 Number of transmit antennas (= # of receive antennas) Capacity (bits/channel use) SNR=0dB 5dB 10dB 15dB 20dB 25dB (a) Capacity versus M for N=M, 0dBSNR25dB 0 5 10 15 20 25 0 10 20 30 40 50 60 SNR (dB) Capacity (bits/s/Hz) Capacity of MIMO systems 1x1 2x2 4x4 8x8