Application of MMSE multi-user detection to CDMA unslotted ALOHA system

Author

Okada, Hiraku ; Grant, Peter M. ; Band, Ian W. ; Ogawa, Akira

Author_Institution

Center for Inf. Media Studies, Nagoya Univ., Japan

Volume

1

fYear

2000

fDate

2000

Firstpage

529

Abstract

A CDMA unslotted ALOHA system using MMSE multi-user detection is proposed. In the CDMA unslotted ALOHA system, a user station can transmit a packet asynchronously, and so the number of simultaneously transmitted packets fluctuates moment by moment. This fluctuation affects the performance of the MMSE multi-user detection. At first, we employ the Wiener filter detector assuming perfect information as an upper bound of the performance of the proposed system. Then, we apply an adaptive filter to CDMA unslotted ALOHA to compensate for the birth/death of a packet

Keywords

FIR filters; Wiener filters; access protocols; adaptive filters; adaptive signal detection; code division multiple access; filtering theory; least mean squares methods; multiuser channels; packet radio networks; CDMA unslotted ALOHA system; MMSE multi-user detection; Wiener filter detector; adaptive FIR filter; asynchronous packet transmission; packet birth/death compensation; packet communication system; perfect information; performance; upper bound; user station; wireless data communications; Adaptive filters; Binary phase shift keying; Finite impulse response filter; Fluctuations; Multiaccess communication; Multiple access interference; Multiuser detection; Throughput; Upper bound; Wiener filter;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal, Indoor and Mobile Radio Communications, 2000. PIMRC 2000. The 11th IEEE International Symposium on

Conference_Location

London

Print_ISBN

0-7803-6463-5

Type

conf

DOI

10.1109/PIMRC.2000.881480

Filename

881480