Opportunistic relaying for dual-hop wireless MIMO channels

Wei Zhang, Khaled Letaief

Research output: Chapter in Book/Report/Conference proceedingConference contribution

21 Citations (Scopus)

Abstract

In wireless relay networks, the use of multiple antennas at both the source and destination can increase the capacity linearly with the number of antennas. In this paper, we investigate amplify-and-forward dual-hop MIMO relay networks without channel state information at the relay nodes, i.e., noncoherent case. In contrast to the conventional approach where the available power is equally distributed over all relay nodes, we propose an opportunistic relaying approach in which only a few very important relays (VIR) are selected to share the power. By doing so, the array gain of MIMO relay networks can be enhanced and thus maximize the ergodic capacity. Simulation results show that the optimal number of selected VIR to maximize the ergodic capacity is identical to the number of antennas employed at the source or destination. Compared to the conventional approach, the proposed opportunistic relaying approach can achieve a higher capacity.

Original languageEnglish
Title of host publication2008 IEEE Global Telecommunications Conference, GLOBECOM 2008
Pages3985-3989
Number of pages5
DOIs
Publication statusPublished - 2008
Externally publishedYes
Event2008 IEEE Global Telecommunications Conference, GLOBECOM 2008 - New Orleans, LA, United States
Duration: 30 Nov 20084 Dec 2008

Other

Other2008 IEEE Global Telecommunications Conference, GLOBECOM 2008
CountryUnited States
CityNew Orleans, LA
Period30/11/084/12/08

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ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Zhang, W., & Letaief, K. (2008). Opportunistic relaying for dual-hop wireless MIMO channels. In 2008 IEEE Global Telecommunications Conference, GLOBECOM 2008 (pp. 3985-3989). [4698539] https://doi.org/10.1109/GLOCOM.2008.ECP.764