RAKE reception with maximal-ratio and equal-gain combining for DS-CDMA systems in Nakagami fading

Author

Alouini, Mohamed-Slim ; Kim, Sang Wu ; Goldsmith, Andrea

Author_Institution

California Inst. of Technol., Pasadena, CA, USA

Volume

2

fYear

1997

fDate

12-16 Oct 1997

Firstpage

708

Abstract

We study coherent binary direct-sequence code division multiple access (DS-CDMA) systems operating over frequency-selective Nakagami fading channels. In particular a performance comparison between maximal-ratio combining (MRC) and equal-gain combining (EGC) RAKE receivers is considered. For interference limited systems, perfect MRC RAKE receivers can accommodate about 5m/(5m-1) more users than EGC RAKE receivers, where m is the Nakagami fading parameter. MRC has a higher rate of improvement than EGC as the number of combined paths increases. However, imperfect or inaccurate channel fading estimation leads to serious degradation in the performance of MRC receivers and in that case EGC becomes superior to MRC

Keywords

code division multiple access; diversity reception; fading; land mobile radio; radio receivers; spread spectrum communication; DS-CDMA systems; EGC; MRC; RAKE receivers; RAKE reception; channel fading estimation; coherent binary direct-sequence code division multiple access; combined paths; degradation; equal-gain combining; frequency-selective Nakagami fading channels; interference limited systems; maximal-ratio combining; performance comparison; Bit error rate; Degradation; Diversity reception; Fading; Frequency; Multiaccess communication; Multipath channels; Power system modeling; RAKE receivers; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Universal Personal Communications Record, 1997. Conference Record., 1997 IEEE 6th International Conference on

Conference_Location

San Diego, CA

ISSN

1091-8442

Print_ISBN

0-7803-3777-8

Type

conf

DOI

10.1109/ICUPC.1997.627256

Filename

627256