Cooperative relaying in next-generation mobile WiMAX networks

Chun Nie, Pei Liu, Thanasis Korakis, Elza Erkip, Shivendra S. Panwar

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Pages (from-to)1399-1405
Number of pages7
JournalIEEE Transactions on Vehicular Technology
Issue number3
StatePublished - 2013


  • Cooperative relaying
  • IEEE 802.16
  • Medium access control (MAC)
  • Mobility
  • Throughput
  • Worldwide Interoperability for Microwave Access (WiMAX)

ASJC Scopus subject areas

  • Automotive Engineering
  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Applied Mathematics


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