Transmit beamforming for frequency-selective channels with decision-feedback equalization

TitleTransmit beamforming for frequency-selective channels with decision-feedback equalization
Publication TypeJournal Article
Year of Publication2007
AuthorsLiang, Y. -wen, R. Schober, and W. Gerstacker
JournalWireless Communications, IEEE Transactions on
Volume6
Pagination4401 -4411
Date Publisheddec.
ISSN1536-1276
Keywordsantenna arrays, antenna correlation, beamforming alters, BFF, channel estimation, codebook design, CSI, decision feedback equalisers, decision-feedback equalization, DFE, diversity reception, fading channels, fading statistics, finite-rate feedback channel, FIR, FIR filters, frequency-selective channels, frequency-selective fading, global vector quantization algorithm, GSM-EDGE channels, GVQ, IIR, IIR filters, infinite impulse response, numerical method, optimized delay diversity, optimum finite impulse response, quantized channel state information, receive antennas, recursive calculation, single-antenna transmission, transmit antenna selection, transmit beamforming schemes, vector quantisation
Abstract

In this paper, we propose beamforming schemes for frequency-selective channels with decision-feedback equalization (DFE) at the receiver and with, respectively, perfect and quantized channel state information (CSI) at the transmitter. For beamforming with perfect CSI and infinite impulse response (IIR) beamforming Alters (BFFs) we provide a closed-form expression for the optimum BFFs. We also devise two efficient numerical methods for recursive calculation of the optimum finite impulse response (FIR) BFFs with perfect CSI. For beamforming with quantized CSI and finite-rate feedback channel, we propose a global vector quantization (GVQ) algorithm for codebook design. This algorithm is deterministic and independent of initial conditions and does not impose any constraints on the number of transmit and receive antennas, the antenna correlation, or the fading statistics. Our simulation results for typical GSM/EDGE channels show that in general short FIR BFFs are sufficient to closely approach the performance of IIR BFFs even in severely frequency-selective channels. Furthermore, finite-rate feedback beamforming with only a few feedback bits achieves significant performance gains over single-antenna transmission, transmit antenna selection, and optimized delay diversity in frequency-selective fading.

URLhttp://dx.doi.org/10.1109/TWC.2007.060256
DOI10.1109/TWC.2007.060256

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