Adaptive LMMSE receivers for CDMA systems over time-varying multipath fading channels

Author

Choi, Jinho ; Kim, Seong Rag ; Jung, Young-Ho ; Hong, Seung-Chul ; Lee, Yong H.

Author_Institution

Dept. of Electr. & Electron. Eng., Adelaide Univ., SA, Australia

Volume

6

fYear

2001

fDate

2001

Firstpage

1955

Abstract

Adaptive linear minimum mean square error (LMMSE) receivers for frequency selective fading channels are developed by modifying the constrained LMMSE receiver of Kim, Jeong and Choi (see IEEE Trans. Commun., vol.48, p.1793-96, 2000). In particular, additional constraints regarding interpath interference are imposed on the constrained optimization proposed by Kim et al., and simple adaptation rules are derived by converting the constrained MMSE problem into an unconstrained optimization. It is shown that the instantaneous SINR of the proposed receiver is always higher than that of the RAKE receiver. Computer simulation results indicate that the proposed receivers can perform better than the existing RAKE and adaptive LMMSE receivers in multipath fading environments

Keywords

adaptive filters; code division multiple access; fading channels; filtering theory; interference suppression; land mobile radio; least mean squares methods; multipath channels; multiuser channels; optimisation; radio receivers; radiofrequency interference; time-varying channels; CDMA systems; RAKE receiver; adaptation rules; adaptive LMMSE receivers; adaptive filter; computer simulation results; constrained LMMSE receiver; constrained MMSE; constrained optimization; frequency selective fading channels; instantaneous SINR; interpath interference; linear minimum mean square error; mobile radio; multiple access interference; time-varying multipath fading channels; unconstrained optimization; Constraint optimization; Fading; Frequency; Interference constraints; Mean square error methods; Multiaccess communication; Multipath channels; RAKE receivers; Signal to noise ratio; Time varying systems;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 2001. ICC 2001. IEEE International Conference on

Conference_Location

Helsinki

Print_ISBN

0-7803-7097-1

Type

conf

DOI

10.1109/ICC.2001.937131

Filename

937131