Pre-RAKE assisted RAKE receiver for TDD WCDMA system

The WCDMA system uses RAKE receiver algorithm or pre-RAKE algorithm to achieve multipath diversity gain. The pre-RAKE algorithm works well in a slow fading environment, but if the channel condition rapidly changes between the uplink and the downlink, the pre-RAKE system performance gets degraded. In this paper, we propose a pre-RAKE assisted RAKE receiver for TDD WCDMA system. The proposed system can simplify the receiver structure, while increasing the total symbol energy of the received signal effectively. By computer simulation, the performance of the proposed system is compared with the conventional RAKE only system and pre-RAKE only system. As a result, the proposed algorithm is proved to achieve better performance than the conventional systems, by more than 3 dB.