On the diversity gain in cooperative relaying channels with imperfect CSIT

Authors:
Xiao Juan Zhang;Yi Gong;Khaled Ben Letaief
Affiliations:
School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore;School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore;Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Hong Kong
Venue:
IEEE Transactions on Communications
Year:
2010

Citing 17
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Abstract

In this paper, we investigate the impact of imperfect channel state information at the transmitters (CSIT) on the achievable diversity gain in a cooperative relaying channel with multiple destination antennas, where the CSIT comes from channel estimation at the transmitters. Both decode-and-forward (DF) and amplify-and-forward (AF) relaying protocols are considered. We show that transmit power control based on the imperfect CSIT significantly improves the achievable diversity gain. The diversity and multiplexing tradeoff (DMT) as a function of the CSIT quality of the source-relay link, source-destination link and relay-destination link is derived for each of the considered relaying schemes. An upper bound on the DMT of the relaying channel is also provided.