Abstract
The multicarrier CDMA(MC-CDMA)communication system based on a combination of CDMA and OFDM techniques, has gained much attention as one of the most promissing next generation mobile communication system which is required of high data rate transmission. In this paper, we propose a quasi-synchronous MC-CDMA scheme with quard time inserted signal format, which can easily suppress both inter symbol and inter channel interfaces and this achieves good BER performances. It could be applicable even to the uplink due to the quasi-synchronous network operation which only requires the synchronization accuracy within guard time interval. The system model description and the system analisis under the multipath fading environment are made and the BER equations are derived for equal gain combining(EGC)and maximum ratio combining(MRC)receivers. Adaptive detectors for both receivers are also descrived. The computer simulation is conducted to clarify the BER characteristics of EGC and MRC receivers of them.
