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|Title:||Efficient Uniform Channel Quantization of Sparse CIR for Downlink OFDM Systems|
|Keywords:||Channel state information|
Random vector quantization
|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.|
|Appears in Collections:||DCT - Artigos/Papers|
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