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Cooperative Relaying in Next-Generation Mobile WiMAX Networks

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5 Author(s)
Chun Nie ; Polytech. Inst., New York Univ., New York, NY, USA ; Pei Liu ; Korakis, T. ; Erkip, E.
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Distributed space-time coding (DSTC) is a key physical (PHY) layer technique to enable cooperative relaying in wireless networks. Compared with direct transmission and single-relay cooperation, DSTC exploits spatial diversity gain and achieves a higher end-to-end throughput performance. In particular, a novel variation of DSTC, which is called randomized DSTC (R-DSTC), further enhances the performance of conventional DSTC in a mobile environment due to its decentralized relay recruitment. This paper presents a medium access control (MAC) protocol, which is called CoopMAX, for Worldwide Interoperability for Microwave Access (WiMAX) systems to provide cooperative relaying with DSTC and R-DSTC techniques by the use of fixed and mobile relays. CoopMAX explores a joint PHY layer and MAC layer optimization for rate adaptation. The efficiency of CoopMAX is investigated, showing pronounced advantages, such as a doubling of throughput as compared with conventional WiMAX protocols in some typical scenarios.

Published in:

Vehicular Technology, IEEE Transactions on  (Volume:62 ,  Issue: 3 )

Date of Publication:

March 2013

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