Development of a CDMA system with rake receiver for the third generation wireless communication systems

The main constituent of the third generation (3G) digital cellular mobile communication systems is a CDMA transceiver. The transmitter includes complex scrambling code generation, channelization code generation, and the spreading operation with both. The receiver involves Rake reception, code synchronization, descrambling code and channelization code generation and the dispreading operations. The Rake receiver is used to mitigate the fading introduced by the wireless channel by maximally combining the delayed replicas of the signal. Its output may be used for further baseband processing for detection. With the present state-of-art VLSI technology, an ASIC solution is essential for a miniaturized full specification 3G air interface development. Therefore, in this paper, we present the development of an ASIC solution, which has been fabricated using the 0.25 mu CMOS technology, for a Rake receiver based 3G CDMA system.