Performance of CDMA random access systems with packet combining in fading channels

Author

Cai, Xiaodong ; Sun, Yi ; Akansu, Ali N.

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Minnesota, Minneapolis, MN, USA

Volume

2

Issue

3

fYear

2003

fDate

5/1/2003 12:00:00 AM

Firstpage

413

Lastpage

419

Abstract

We analyze the system performance of code-division multiple-access (CDMA) random access systems with linear receivers and packet combing in multipath fading channels. Both slotted and unslotted CDMA systems with random spreading codes are considered. The analysis is based on large systems in which both the offered load and the processing gain tend to infinity but their ratio is fixed. It is relatively easy to characterize the traffic in such large systems, which enables us to derive the system throughput and average delay. From the analysis results, it is observed that multiuser detection and packet combining substantially improve the system performance.

Keywords

access protocols; code division multiple access; diversity reception; fading channels; multipath channels; multiuser channels; packet radio networks; radio receivers; random processes; spread spectrum communication; CDMA random access systems; average delay; code division multiple access; interference suppression; linear receivers; multipath fading channels; multiuser detection; offered load; packet combing; packet combining; processing gain; random spreading codes; slotted CDMA systems; system performance; system throughput; traffic; unslotted CDMA systems; Automatic repeat request; Diversity reception; Fading; Government; H infinity control; Multiaccess communication; Multiuser detection; Performance analysis; Sun; System performance;

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2003.811175

Filename

1198090