Mutual Information of Isotropically Distributed Unitary Signals on Block Rayleigh-faded Multiple Access Channels

We study the mutual information of isotropically distributed unitary signals on block Rayleigh-faded MAC. We use the model that assumes no prior knowledge of the channel at either the transmitter or the receiver end, but assumes that the fading coefficients remain constant for a coherenece interval of T symbols. We focus on the scenario when the number of users is K, the number of receive antennas is N and the coherenece time is T. We compute the mutual information of the non-coherent MAC for different values of SNR