Spectral efficiency of the feedback receiver for two sets of orthogonal sequences

Author

Djonin, Dejan V. ; Bhargava, Vijay K.

Author_Institution

Dept. of Electr. & Comput. Eng., Victoria Univ., BC, Canada

Volume

6

Issue

11

fYear

2002

Firstpage

497

Lastpage

499

Abstract

We present the spectral efficiency analysis of the recently proposed feedback receiver for two sets of orthogonal sequences (TSOS) scheme which is capable of supporting higher number of users than the spreading gain of the DS/CDMA system. The added complexity is minimal compared to the conventional matched filter. We show that in the case of coded system, spectral efficiency of this scheme is close to that of a Gaussian multiple access channel if the incomplete group of orthogonal sequences is detected first. We also discuss the choice of orthogonal sequences that maximizes the spectral efficiency. This analysis is extended for the case of flat fading channels.

Keywords

code division multiple access; fading channels; feedback; multiuser detection; radio receivers; sequences; spectral analysis; spread spectrum communication; Gaussian multiple access channel; TSOS scheme; feedback receiver; flat fading channels; multiuser detection; spectral efficiency analysis; synchronous DS-CDMA system; two sets of orthogonal sequences; Detectors; Fading; Feedback; Gaussian noise; Iterative algorithms; Matched filters; Multiaccess communication; Multiuser detection; Power system modeling; Spectral analysis;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2002.805516

Filename

1049156