Passive MIMO transmission using load modulation

This paper has proposed passive MIMO transmission using load modulation. In this method, load modulation is applied to the multi-antenna, and a number of signals are transmitted in parallel. When the transmission rate is 4 Bits/symbol, the threshold noise power when BER = 10^-2 is improved by 4.7 dB compared to SISO for the mono-static structure, and is improved by 8.5 dB for the bi-static structure. It is found that the required power can be reduced by 3.8 dB for the bi-static structure compared to that for the mono-static structure. When the transmission rate is 12 Bits/symbol, the threshold noise power with m = 2 is alleviated by 17 dB, and the threshold noise power with m = 6 is alleviated by 32 dB compared to that with m= 1, respectively. It is found that the many more the number of the antenna elements becomes, the higher the noise threshold becomes. These results support the passive MIMO transmission using load modulation allows high-speed data transmission without using the transmitter at the tag antenna.