Stabilized multi-channel ALOHA for wireless OFDM networks

Author

Shen, Dongxu ; Li, Victor O K

Author_Institution

Dept. of Electr. & Electron. Eng., Hong Kong Univ., China

Volume

1

fYear

2002

fDate

17-21 Nov. 2002

Firstpage

701

Abstract

Multiple access based on orthogonal frequency division multiplexing (OFDM), or OFDMA, enables multiple users to simultaneously access the media by using different subcarriers. This leads to the convenient realization of multi-channel ALOHA, in which each user transmits with a group of subcarriers. In this paper, we first introduce the multi-channel slotted ALOHA algorithm to OFDM, which is called OFDMA-based multi-channel ALOHA (OMC-ALOHA). Since ALOHA is an unstable algorithm, we show OMC-ALOHA is also unstable. To solve this stability problem, we extend the pseudo-Bayesian algorithm to achieve stabilized OMC-ALOHA.

Keywords

Bayes methods; OFDM modulation; access protocols; OFDMA; multiple users; orthogonal frequency division multiplexing; pseudo-Bayesian algorithm; slotted ALOHA algorithm; stability problem; stabilized multi-channel ALOHA; subcarriers; wireless OFDM networks; Base stations; Channel state information; Error analysis; Feedback; Frequency division multiaccess; Interference; Multiaccess communication; OFDM; Throughput; Wireless LAN;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE

Print_ISBN

0-7803-7632-3

Type

conf

DOI

10.1109/GLOCOM.2002.1188169

Filename

1188169