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A Multicarrier CDMA System Using Divided Spreading Sequence for Time and Frequency Diversity  

박형근 ((주)현대시스콤 시스템 그룹)
주양익 (고려대학교 전자공학과 차세대 이동통신 연구실)
김용석 (고려대학교 전자공학과 차세대 이동통신 연구실)
차균현 (고려대학교 전자공학과 차세대 이동통신 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.27, no.6B, 2002 , pp. 569-578 More about this Journal
Abstract
This paper proposes a new multicarrier code division multiple access (CDMA) system. The proposed multicarrier CDMA system provides the advantages that the transmission bandwidth is more efficiently utilized by using divided spreading sequence, time and frequency diversity is achieved in frequency selective nultipath (acting channel, and inter-carrier interference (ICI) can be minimized by using specific data and code pattern. In this system, transmitted data bits are serial-to-parallel converted to some parallel branches. On each branch each bit is direct-sequence spread-spectrum modulated by divided spreading sequences and transmitted using orthogonal carriers. The receiver providers a Rake for each carrier, and the outputs of Rakes are combined to get time and frequency diversity. This multicarrier CDMA system allows additional flexibility in the choice of system parameters. Upon varying system parameters, bit error rate (BER) performance is examined for the proposed multicarrier CDMA system. Simulation results show that the proposed multicarrier CDMA scheme can achieve better performance than the other types of conventional multicarrier CDMA systems.
Keywords
multicarrier CDMA; OFDM; Rake receiver;
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