Asynchronous cooperative transmission mechanism using distributed Orthogonal Frequency Division Multiplexing for mobile ad hoc networks. (3rd July 2008)

• Record Type: Journal Article
• Authors: Yu, Quan; Fu, Tielian; Zheng, Jun; Zhang, Baoxian
• Is Part Of: International journal of autonomous and adaptive communications systems. Volume 1:Number 1(2008)
• Page Start: 106
• Page End: 121
• Publication Date: 2008-07-03
• Subjects: 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; Adaptive computing systems -- Periodicals; Wireless communication systems -- Periodicals; Computer networks -- Periodicals; 004.6
• Languages: English
• ISSNs: 1754-8632

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.