Array Gain and Diversity Order of Multiuser MISO Antenna Systems

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In considering generalized zero-forcing, this paper derives the optimal linear signal processing solution for the multiuser multiple-input single-output (MISO) broadcast fading channels where a single base station is communicating simultaneously to many mobile stations in the same frequency and time slot. We then investigate the array gain, defined as the average of the squared channel response, and the diversity order, defined as the inverse of the normalized variance of the squared channel response, of the optimized system. It is concluded that each user in the multiuser MISO system behaves like a single-user system with (nT − M + 1)-th order receiver diversity if there are M simultaneous users and nT antennas are employed at the base station.

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