Analytical evaluation and performance analysis of antenna verification algorithm in closed loop antenna diversity

This paper proposes an analytical study and a bit-error-rate (BER) analysis for antenna verification algorithm to be used in closed loop mode one antenna diversity. The purpose of such algorithm, envisaged in 3GPP, is to improve the receiver performance in the case when the BTS applies a wrong phase rotation to antenna 2 because of a demodulation error on the reverse-link. After a deep analytical description of this algorithm, a performance analysis is done for comparing closed loop mode one scheme among the perfect-feedback case (uplink BER=0) and the case when the uplink is affected by a certain error rate, with and without antenna diversity.