MIMO Self-Heterodyne OFDM

Self-heterodyne orthogonal frequency-division multiplexing (self-het OFDM) is a promising physical-layer technique for millimeter-wave and terahertz RF communication due to its simple RF front end and complete immunity against frequency offset and phase noise. In this paper, we proposed a multiple-input-multiple-output (MIMO) self-het OFDM with the adaption of the smart carrier positioning (SCP) technique. At the transmitter, a space-time block code (STBC) is used to produce the coded information symbols to be transmitted on each antenna over the self-het OFDM subcarriers. At the receiver, a simple nonlinear detection is adopted at each receive antenna. The achievable diversity order of such setting is analyzed, and it is found that with the adaptation of the SCP technique, the diversity loss in comparison to the conventional coherent MIMO-OFDM can be compensated. We further derive analytically both lower and upper bounds on the diversity order of the proposed scheme, and simulations will be shown to illustrate the performance of such combination.