A NOVEL TRANSMISSION DIVERSITY SYSTEM IN TDD-CDMA

This paper presents a novel transmission diversity scheme for code div ision multiple access system. Conventional diversity receivers in mobi le stations require space and complicated circuits, however, the propo sed diversity schemes present significant diversity effect without any diversity equipment at the mobile station. It is possible to use the transmitter diversity at the base station by using the feature of time division duplex (TDD) which has strongly correlated fading patterns i n both forward and reverse link. Computer simulation is performed to e valuate the performance of the proposed systems for single user enviro nment. The performance of the system 1, which select best situated ant enna, is analyzed and the BER performance for multiple access is prese nted.