DocumentCode :
3285793
Title :
MAI mitigation by SIC for a multicarrier CDMA system
Author :
Kim, Jin Young ; Huh, Hoon
Author_Institution :
Kwangwoon Univ., Seoul, South Korea
fYear :
2003
fDate :
15-17 Oct. 2003
Firstpage :
103
Lastpage :
104
Abstract :
Summary form only given. In a code division multiple access (CDMA) system, multiple access interference (MAI) coupled with the near-far problem is one of the major factors limiting system performance. To overcome these issues, various multiuser detection schemes have been proposed. The complexity of the multiuser detection schemes is important, especially when they are adopted in a multicarrier DS/CDMA system which employs lots of subcarriers. Successive interference cancellation (SIC) is relatively simpler than other multiuser detection schemes when used in a multicarrier CDMA system because it does not require separate channel estimation for each of the subcarriers. A SIC scheme based on order statistics is proposed and analyzed for a multicarrier CDMA system over a Rayleigh fading channel. The SIC scheme is employed for each subcarrier, and the subcarrier signals, after interference cancellation, are combined through maximal-ratio or equal-gain combining techniques. The effect of imperfect interference cancellation is also investigated. From the numerical results, it is shown that the proposed system achieves significant performance improvement over a conventional multicarrier CDMA system. The proposed system is robust to MAI and the near-far problem, which translates to a significant increase in system capacity.
Keywords :
Rayleigh channels; code division multiple access; interference suppression; multiuser detection; radiofrequency interference; spread spectrum communication; statistical analysis; DS/CDMA; MAI mitigation; Rayleigh fading channel; SIC; code division multiple access; equal-gain combining; maximal-ratio combining; multicarrier CDMA; multiple access interference; multiuser detection; order statistics; successive interference cancellation; Channel estimation; Diversity reception; Fading; Interference cancellation; Multiaccess communication; Multiple access interference; Multiuser detection; Silicon carbide; Statistical analysis; System performance;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Wireless Communication Technology, 2003. IEEE Topical Conference on
Print_ISBN :
0-7803-8196-3
Type :
conf
DOI :
10.1109/WCT.2003.1321445
Filename :
1321445
Link To Document :
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