Acta Metallurgica Sinica(English letters)

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Iterative multi-user detection and decoding for space-time block coding systems

JIN Yi-dan;ZHANG Feng;WU Wei-ling

  

  1. School of Information Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2006-01-09 Revised:1900-01-01 Online:2006-12-30
  • Contact: JIN Yi-dan

Abstract: To restrain the interference of co-channel users using space-time block coding (STBC), the proposed Gaussian-forcing soft decision multi-user detection (GFSDMUD) algorithm is applied in flat-fading channels by using the relation among the users’ signals, which can enhance the capacity by introducing co-channel users. During iterations, extrinsic information is calculated and exchanged between a soft multi-user detector and a bank of turbo decoders to achieve refined estimates of the users’ signals. The simulations show that the proposed iterative receiver techniques provide significant performance improvement around 2 dB over conventional noniterative methods. Furthermore, iterative multi-user space-time processing techniques offer substantial performance gains around 8 dB by adding the number of receiver antennas from 4 to 6, and the system performance can be enhanced by using this strategy in multi-user STBC systems, which is very important for enlarging the system capacity.

Key words: STBC;multi-user detection;Turbo processing;gaussian-Forcing soft decision;Turbo channel decoding

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