QRD-based precoded MIMO-OFDM systems with reduced feedback

Authors:
Kyeong Jin Kim;Man-On Pun;Ronald A. Iltis
Affiliations:
-;Mitsubishi Electric Research Laboratories, Cambridge, MA;Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA
Venue:
IEEE Transactions on Communications
Year:
2010

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Abstract

QR decomposition (QRD)-based precoded MIMO-OFDM systems with reduced feedback are proposed to convert the MIMO-OFDM channel into layered subchannels. QRD-M is further combined with either singular value (SVD) or geometric mean decomposition (GMD) of the time-domain channel impulse response matrix. As a result, the receiver in the proposed systems only needs to feed back information describing one precoding matrix for all carriers. Simulation results confirm the bit-error-rate (BER) and throughput performance superiority of the proposed systems compared to conventional SVD per-carrier precoding schemes.