Effects of mutual coupling and amplitude/phase mismatch on a WCDMA downlink receiver with multiple antennas

In this paper we study the effects of mutual coupling and amplitude/phase mismatch on a WCDMA downlink receiver using multiple antennas in the user terminal. Analytical expressions are obtained for the Zero-Forcing and for the Minimum Mean-Square Error receiver, in which the implicit effects of the mutual couplig and amplitude/phase mismatch matrices are taken into account. Simulation results for a time-variant COST 259 channel model, using an adaptive LMS receiver, show that these non-ideal behaviors in a co-linear array have negligible effects on performance when the antenna spacing is λ/2. For λ/4 spacing there is a loss in receiver performance for low values of signal-to-noise ratios.