The OFDM signal is considered as the primary signal and the Rayleigh fading is regarded as the propagation channel. The size of the sampling covariance matrix is 10×10×2. The number of antennas in the multi-
antenna system used in this paper is M=10. The channel
number of a true color image is 3, where the channel number
of the sampling covariance matrix is 2 (the real part and the
imaginary part) and the third channel is set to a zero matrix.
The matrix size depends on the antenna number of the multi-