Adaptive bit-interleaved coded OFDM with reduced feedback information

Chang Kyung Sung, Sae Young Chung, Jun Heo, Inkyu Lee

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

If the channel is static and is perfectly known to both the transmitter and the receiver, the water-filling technique with adaptive modulation is known to be optimal (Gallager, 1968). However, for orthogonal frequency-division multiplexing (OFDM) systems, this requires intensive traffic overheads for reporting channel state information on all subcarriers to the transmitter. In this paper, we consider an adaptive modulation and coding scheme for bit-interleaved coded OFDM with reduced feedback information satisfying a specified quality of service level. We propose a rate adaptation scheme, which utilizes the estimated bit error rate for supportable transmission rates. In this scheme, a user equipment chooses a modulation and coding scheme (MCS) level, which can provide the maximum spectral efficiency based on one OFDM symbol rather than on all subchannels. Then the user needs to send back only the selected MCS level index. The proposed scheme does not require the water-filling procedure, and the amount of the feedback information reduces to a single integer value irrespective of the number of subcarriers. Simulation results show that the proposed scheme can significantly reduce the system complexity while minimizing the performance loss compared to the optimum water-filling scheme.

Original languageEnglish
Pages (from-to)1649-1655
Number of pages7
JournalIEEE Transactions on Communications
Volume55
Issue number9
DOIs
Publication statusPublished - 2007 Sep

Keywords

  • Adaptive modulation and coding (AMC)
  • Bit-interleaved coded modulation (BICM)
  • Fading channels

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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