Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/13698
Title: Adaptive parallel interference cancellation receivers with diversity combining for multicarrier DS CDMA systems
Authors: WANG HUAHUI
Keywords: Multicarrier DS-CDMA,Parallel interference cancellation,Multiple access interference,Asychronous and synchronous systems,bit-error-rate performance
Issue Date: 31-Jan-2004
Source: WANG HUAHUI (2004-01-31). Adaptive parallel interference cancellation receivers with diversity combining for multicarrier DS CDMA systems. ScholarBank@NUS Repository.
Abstract: Multicarrier direct sequence code division multiple access (MC-DS-CDMA) system is one of the promising candidates for high bit rate transmission. However, in spite of its capability of combating the multiple selective fading, the multiple access interference (MAI) problems inherent to the single-carrier (SC-) DS-CDMA system can also degrade its system performance. This thesis deals with the issues of MAI cancellation for the MC-DS-CDMA systems. A parallel interference cancellation (PIC) receiver with an adaptive MAI estimation stage is proposed for both the synchronous and asynchronous MC-DS-CDMA systems. Maximal ratio combining (MRC) technique is also adopted to exploit the frequency diversity provided by the MC-DS-CDMA systems to further improve the performance. The receiver design of synchronous and asynchronous systems becomes different when a subcarrier-based program is adopted to structure the synchronous MC-DS-CDMA system by taking advantage of the synchronization of all users. Simple but accurate closed form expressions for the bit error rate (BER) of the proposed adaptive PIC (APIC) detectors are derived theoretically. Simulations are carried out to verify the theory. The system performance of the proposed APIC receiver is investigated in details under various conditions. The investigation has shown that significant performance improvement can be achieved over the matched filter (MF) and the conventional PIC (CPIC) receiver.
URI: http://scholarbank.nus.edu.sg/handle/10635/13698
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