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Title: Efficient Uniform Channel Quantization of Sparse CIR for Downlink OFDM Systems
Authors: Dinis, Rui
Teodoro, Sara
Silva, Adão
Gameiro, Atílio
Keywords: Channel state information
Limited feedback
Random vector quantization
Sparse channels
Uniform quantization
Issue Date: 2017
Publisher: Springer
Citation: Teodoro, S., Silva, A., Dinis, R. et al. Wireless Pers Commun (2017) 96: 799
Abstract: Channel state information at the transmitter side is an important issue for wireless communications systems, namely when precoding techniques are employed. Recent works explored random vector quantization (RVQ) as a solution for limited feedback for multi-user systems equipped with multiple antennas. Despite of being a good option for narrowband channels, this method requires large complexity and is not efficient for sparse channels. To overcome these drawbacks we consider a strategy based on uniform quantization, denoted partial uniform quantization (P-UQ), where just part of channel frequency response is quantized. This allows an efficient feedback of channel frequency response from the receivers to the transmitter, by using a reduced number of quantization bits. The comparison between the proposed P-UQ-based method and RVQ performed in this paper leads to the conclusion that the most advantageous method for sparse channels is the P-UQ.
Peer Reviewed: yes
metadata.dc.identifier.doi: 10.1007/s11277-017-4201-8
ISSN: 0929-6212
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Appears in Collections:DCT - Artigos/Papers

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