Title :
Iterative semi-blind multiuser detection for coded MC-CDMA uplink system
Author :
Kafle, Padam L. ; Sesay, Abu B.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Calgary, Alta., Canada
fDate :
7/1/2003 12:00:00 AM
Abstract :
We propose two types of iterative semi-blind receivers for coded multicarrier code-division multiple-access (MC-CDMA) uplink systems in the presence of both intracell and intercell interference. The first is based on the minimum mean-square error criterion, and the second is a hybrid scheme, consisting of parallel interference cancellation and linear multiuser detection. These iterative receivers utilize known users´ information for the computation of log-likelihood ratios (LLR) while blindly suppressing unknown interference. The LLR are refined successively during the iterative process through decoding of all known users. Simulation results demonstrate that the proposed iterative semiblind methods offer substantial performance gain over conventional noniterative and nonblind iterative receivers.
Keywords :
adjacent channel interference; cellular radio; cochannel interference; code division multiple access; interference suppression; iterative decoding; least mean squares methods; multiuser detection; radio receivers; LLR; coded MC-CDMA uplink; decoding; hybrid scheme; intercell interference; interference suppression; intracell interference; iterative semi-blind receivers; linear multiuser detection; log-likelihood ratios; minimum mean-square error; multicarrier code-division multiple access; parallel interference cancellation; performance; semi-blind multiuser detection; successive refinement; Computational modeling; Interference cancellation; Interference suppression; Iterative decoding; Iterative methods; Multiaccess communication; Multicarrier code division multiple access; Multiple access interference; Multiuser detection; Performance gain;
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOMM.2003.814206
