Title :
Application of conjugate gradient methods in MMSE equalization for the forward link of DS-CDMA
Author :
Chowdhury, Samina ; Zoltowski, Michael D.
Author_Institution :
Dept. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA
fDate :
6/23/1905 12:00:00 AM
Abstract :
The chip-level MMSE estimate of the (multiuser) synchronous sum signal transmitted by the base-station, followed by a correlate and sum, has been shown to perform very well in the CDMA forward link using orthogonal channel codes. In this paper, adaptive chip-level MMSE estimation based on the conjugate gradient (CG) algorithm is presented. Our simulations show that, adaptive CG using the pilot channel for training can achieve excellent convergence at a moderate computational cost
Keywords :
adaptive estimation; channel coding; code division multiple access; conjugate gradient methods; convergence of numerical methods; equalisers; fading channels; land mobile radio; least mean squares methods; multiuser channels; radio links; spread spectrum communication; DS-CDMA; MMSE equalization; adaptive CG; adaptive chip-level MMSE estimation; basestation; computational complexity; computational cost; conjugate gradient methods; convergence; correlation; forward link; frequency selective fading; long code scrambling; mobile receiver antennas; multiuser synchronous sum signal; pilot channel; simulations; training; Character generation; Computational efficiency; Computational modeling; Equalizers; Fading; Frequency; Gradient methods; Multiaccess communication; Multipath channels; Receiving antennas;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Fall. IEEE VTS 54th
Conference_Location :
Atlantic City, NJ
Print_ISBN :
0-7803-7005-8
DOI :
10.1109/VTC.2001.957186
