Performance analysis of two-branch space-time block coded DS-CDMA systems in time-varying multipath Rayleigh fading channels

Author

Chiang, Ping-Hung ; Li, Hsueh-Jyh ; Lin, Ding-Bing

Author_Institution

Nat. Taiwan Univ., Taipei, Taiwan

fYear

2004

fDate

30 Aug.-2 Sept. 2004

Firstpage

130

Lastpage

134

Abstract

Based on Alamouti code, two-branch transmit diversity DS-CDMA systems, namely, space-time block coded DS-CDMA (STBC-DS-CDMA) systems are discussed. Besides the simple maximum-likelihood (SML) detector, three novel detectors are applied to improve the STBC-DS-CDMA systems. Additionally, for random binary spreading code (RBSC), the performance of all systems in spatially uncorrelated time-varying multipath Rayleigh fading channels are derived theoretically. In consequence of the simple expression for the variances of the multipath interference (MPI) and the multiuser interference (MUI), our analytical results are easy to calculate. Numerical outcomes have revealed that significant performance improvement can be achieved even when the systems are operated in highly selective channels.

Keywords

Rayleigh channels; binary codes; block codes; code division multiple access; diversity reception; maximum likelihood decoding; maximum likelihood detection; multipath channels; multiuser detection; random codes; space-time codes; spread spectrum communication; time-varying channels; Alamouti code; DS-CDMA systems; MPI; MUI; STBC-DS-CDMA; highly selective channels; multipath Rayleigh fading channels; multipath interference; multiuser interference; performance analysis; random binary spreading code; simple maximum-likelihood detector; space-time block code; spatially uncorrelated channels; time-varying channels; two-branch transmit diversity; Analysis of variance; Baseband; Detectors; Fading; Interference; Maximum likelihood detection; Multiaccess communication; Performance analysis; Receiving antennas; Time varying systems;

fLanguage

English

Publisher

ieee

Conference_Titel

Spread Spectrum Techniques and Applications, 2004 IEEE Eighth International Symposium on

Print_ISBN

0-7803-8408-3

Type

conf

DOI

10.1109/ISSSTA.2004.1371678

Filename

1371678