Title :
Multiple-antenna CDMA mobile reception using constrained normalized adaptive algorithms
Author :
Werner, Stefan ; Apolinario, J.A., Jr. ; Laakso, Timo I.
Author_Institution :
Lab. of Telecom. Technol., Helsinki Univ. of Technol., Espoo, Finland
Abstract :
We analyze adaptive algorithms for a multiple-antenna code division multiple access (CDMA) mobile receiver. We study the constrained versions of the binormalized data-reusing LMS (BNDR-LMS) and the normalized LMS (NLMS). Their performance is compared with that of the classical Frost algorithm. Time-varying step-sequences are used to further enhance the performance of the receiver. The results show that considerable improvement in the convergence speed can be achieved with the use of the normalized algorithms compared with the conventional Frost algorithm. Using an optimal step-sequence in the update provides a fast convergence and a near-optimum steady-state performance
Keywords :
adaptive antenna arrays; code division multiple access; convergence; least mean squares methods; mobile antennas; mobile radio; radio receivers; receiving antennas; sequences; BNDR-LMS; CDMA; Frost algorithm; NLMS; binormalized data-reusing LMS; code division multiple access; constrained normalized adaptive algorithms; convergence speed; mobile receiver; multiple-antenna reception; normalized LMS; optimal step-sequence; steady-state performance; time-varying step-sequences; Adaptive algorithm; Algorithm design and analysis; Convergence; Interference suppression; Laboratories; Least squares approximation; Mobile antennas; Multiaccess communication; Receiving antennas; Signal processing algorithms;
Conference_Titel :
Telecommunications Symposium, 1998. ITS '98 Proceedings. SBT/IEEE International
Conference_Location :
Sao Paulo
Print_ISBN :
0-7803-5030-8
DOI :
10.1109/ITS.1998.713146
