Efficient Uniform Channel Quantization of Sparse CIR for Downlink OFDM Systems

Sara Teodoro, Adão Silva, Rui Dinis, Atílio Gameiro

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)799-812
Number of pages14
JournalWireless Personal Communications
Issue number1
Publication statusPublished - Sep 2017


  • Channel state information
  • Limited feedback
  • Random vector quantization
  • Sparse channels
  • Uniform quantization


Dive into the research topics of 'Efficient Uniform Channel Quantization of Sparse CIR for Downlink OFDM Systems'. Together they form a unique fingerprint.

Cite this