Abstract
Motivated by large capacity gains in multiple antenna systems when ideal channel state information (CSI) is available at both receiver and transmitter when quadrature amplitude modulation (QAM) modulation is applied, we examine the achievable rates of Rayleigh fading channel measurement based optimization techniques. We consider complex-valued AWGN noise and try to determine the optimal input distribution of fixed signalling points. With the aid of Hermite polynomials and under even-moment constraint, numerical results show that the information rate is achieved with unique and optimal distribution.
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