Space-time-frequency multiuser detection over fast-fading multipath channels for synchronous DS-CDMA systems


Ertug O., Baykal B.

53rd IEEE Vehicular Technology Conference (VTC), RHODES, Greece, 6 - 09 May 2001, pp.1503-1507 identifier

  • Publication Type: Conference Paper / Full Text
  • City: RHODES
  • Country: Greece
  • Page Numbers: pp.1503-1507

Abstract

RAKE receivers suffer degradation in performance under fast fading due to errors in channel state estimation. The wide-sense stationary uncorrelated scatterer channel model lends itself to time-frequency canonical representation, and provides additional diversity in the frequency axis. Using the joint spatial-multipath-Doppler diversity model based on this canonical representation with multiple antennas, we first develop linear spacetime-frequency multiuser detectors base on decorrelating and MMSE interference supression techniques and further present nonlinear space-time-frequency decision-driven multiuser detectors based on interference cancellation ideas to operate over the fast-fading multipath synchronous CDMA channels. Simulation results based on realistic fast-fading assumptions demonstrate that the nonlinear detectors present improved bit-error-rate performance over the linear detectors and all proposed detectors exhibit significant resistance to the near-far effect.