ORTHOGONAL MULTICODE OFDM-DS CDMA SYSTEM USING PARTIAL BANDWIDTH TRANSMISSION/

In this paper, Orthogonal Multicode OFDM-DS/COMA system using Partial Bandwidth Transmission is proposed. By using the flexible carrier allo cation of OFDM, Partial Bandwidth Transmission is considered for high quality communication. Furthermore, multicode packet data transmission is presented. Multicode packet data transmission is very effective to handle variable data. Since the proposed system can detect the header information without complex control, it is also suitable for packet d ata transmission. The computer simulation results show that the BER pe rformance of the proposed system with the ideal channel estimation is improved compared with the case of the conventional Orthogonal Multico de DS/CDMA system with ideal RAKE receivers. Moreover the proposed sys tem with the channel estimation by MLS algorithm also shows the good B ER performance. In packet data transmission, the delay and throughput performances are also improved in the proposed system.