Subchannel allocation in relay-enhanced OFDMA downlink with imperfect feedback

Authors:
Jouko Leinonen;Taneli Riihonen;Jyri Hämäläinen;Markku Juntti
Affiliations:
University of Oulu, Oulu, Finland;Helsinki University of Technology, Finland;Helsinki University of Technology, Finland;University of Oulu, Oulu, Finland
Venue:
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Year:
2009

Citing 5
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Abstract

This paper studies the resource allocation for orthogonal frequency division multiple access (OFDMA) in a fixed amplify-and-forward (AF) relay link. We express closed-form average capacity results for the system when frequency allocation is based on limited and imperfect feedback information and multiple antennae are assumed at the relay node (RN) and the user equipment (UE). Feedback strategies based on the best-M method and resource block (RB)-wise one bit quantization are analyzed and compared. Capacity expressions are presented for space-time block coding (STBC) and transmit antenna selection (AS) schemes. The capacity results with imperfect feedback path are of particular interest. The results illustrate that promising tradeoff between the system performance, feedback overhead, and robustness against feedback errors can be achieved by using AS and limited feedback in frequency allocation.