Title: Asynchronous cooperative transmission mechanism using distributed Orthogonal Frequency Division Multiplexing for mobile ad hoc networks

Authors: Quan Yu, Tielian Fu, Jun Zheng, Baoxian Zhang

Addresses: CCCE, Graduate University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China. ' CCCE, Graduate University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China. ' SITE, University of Ottawa, Ottawa, Ontario K1N6N5, Canada. ' CCCE, Graduate University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China; Key Lab of Wireless Sensor Networks and Communications, Shanghai Institute of Microsystem and Information Technology of Chinese Academy of Sciences, Shanghai 200050, China

Abstract: In this article, we propose an asynchronous cooperative transmission mechanism for Mobile ad hoc Networks (MANETs). The proposed cooperative transmission mechanism employs distributed Unitary Space-Frequency Coded-Orthogonal Frequency Division Multiplexing (USFC-OFDM), which does not require any channel estimation and has a lower decoding complexity, and therefore can provide better reliability and robustness when mobile nodes move fast. Moreover, it can achieve a larger diversity gain and multiplexing gain, and can thus combat fast time-varying and frequency-selective channel fading, and tolerate imperfect synchronisation among mobile nodes. To support USFC-OFDM, a Time Division Multiple Access-based Cooperative Medium Access Control protocol and an on-demand Cooperative Dynamic Source Routing protocol are also proposed. Through simulation results, we show that the proposed USFC-OFDM-based cooperative transmission mechanism can significantly improve the network performance in terms of packet delivery ratio and bit error rate in highly dynamic mobile environments.

Keywords: cooperative transmission; MANET; OFDM; TDMA; unitary space-frequency codes; distributed multiplexing; orthogonal frequency division multiplexing; mobile networks; ad hoc networks; reliability; robustness; simulation; medium access control; MAC protocol; cooperative dynamic source routing; packet delivery ratio; bit error rates.

DOI: 10.1504/IJAACS.2008.019202

International Journal of Autonomous and Adaptive Communications Systems, 2008 Vol.1 No.1, pp.106 - 121

Published online: 02 Jul 2008 *

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