Adaptive multiuser detection with decision feedbackequalization based IDMA systems on underwateracoustic channels

  1. Lookup NU author(s)
  2. Dr Charalampos Tsimenidis
  3. Professor Bayan Sharif
  4. Emeritus Professor Oliver Hinton
Author(s)Tsimenidis CC; Hinton OR; Sharif BS; Aliesawi S; Johnston M
Editor(s)
Publication type Conference Proceedings (inc. Abstract)
Conference NameThe 10th European Conference on Underwater Acoustics (ECUA)
Conference LocationIstanbul, Turkey
Year of Conference2010
Legacy Date5-9 July 2010
Volume
Pages
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A single-element downlink interleave division multiple access (IDMA) receiver employing adaptive chip-level decision feedback equalization (DFE) is considered for multi-user communications over frequency selective channels. A continuous pilot based adaptive DFE, which is suitable for fast multipath fading channels, is optimized based on the mean square error (MSE) criterion and adapted iteratively by exchanging soft information with the turbo processing stage. The detection is implemented using soft-chip cancellation to remove multiple access interference (MAI) effects between users and the error propagation in the DFE is eliminated by employing iterative soft-decision feedback. Furthermore, the receiver equations describing the detection algorithms are presented and simulation results for synchronous multiuser scenarios over a wide range of normalized Doppler spreads show that the iterative IDMA receiver using an adaptive DFE reduces intersymbol interference (ISI) and error-propagation in the DFE effciently. More importantly, the DFE based IDMA receiver with continuous pilots outperforms the IDMA receiver with conventional training based equalization.