Noncoherent Multiuser Space-Time Communications: Optimum Receivers and Signal Design
نویسندگان
چکیده
The jointly optimum noncoherent receiver is obtained for multiuser communications in a frequency non-selective Rayleigh fading channel with NT transmit antennas per user and NR receive antennas. Based on a general analysis of quadratic receivers in zero-mean complex Gaussian vectors, we derive asymptotically (for high SNR) tight expressions for the pair-wise error probabilities for some cases of interest. This analysis yields the important result that the number of dimensions needed for each of the K users to achieve full diversity order N = NTNR is (K + 1)NT, which is independent of the size of the users’ codebooks. Our asymptotic analysis also yields a performance criterion to design noncoherent multiuser signals for space-time channels. We give an example of such a design. Gains in spectral efficiency are more difficult to realize for noncoherent (as compared to coherent) channels.
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