Title :
Adaptive weighted least squares CDMA multiuser detection
Author :
Borah, Deva E. ; Rapajic, Predrag B.
Author_Institution :
Klipsch Sch. of Electron. & Comput. Eng., New Mexico State Univ., Las Cruces, NM, USA
Abstract :
Adaptive optimal CDMA multiuser detection can be performed by using a bank of MMSE filters followed by a Viterbi detector. Several characteristics of this receiver structure are investigated. It is shown that this receiver can successfully suppress narrow band interference (NBI). The effect of the MMSE filter length on MSE is investigated and it is shown that the MMSE filter length needs to be only a few symbols long. The complexity/performance tradeoff capability of the receiver is studied. It is observed that this receiver, at one end, becomes the linear MMSE receiver with lowest complexity and, at the other end, it becomes the maximum likelihood (ML) receiver with highest complexity
Keywords :
adaptive signal detection; cellular radio; channel bank filters; code division multiple access; computational complexity; filtering theory; interference suppression; least mean squares methods; maximum likelihood detection; multiuser channels; radio receivers; radiofrequency interference; spread spectrum communication; DS-CDMA; MMSE filter bank; MMSE filter length; Viterbi detector; adaptive optimal CDMA multiuser detection; adaptive weighted least squares; complexity; complexity/performance tradeoff; linear MMSE receiver; maximum likelihood receiver; multicellular CDMA system; narrow band interference suppression; Adaptive filters; Detectors; Filter bank; Interference suppression; Least squares methods; Maximum likelihood detection; Multiaccess communication; Multiuser detection; Narrowband; Viterbi algorithm;
Conference_Titel :
Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st
Conference_Location :
Tokyo
Print_ISBN :
0-7803-5718-3
DOI :
10.1109/VETECS.2000.851424
