Linear-time block noncoherent detection of PSK

  • Authors:

  • Robby G. McKilliam;I. Vaughan L. Clarkson;Daniel J. Ryan;Iain B. Collings

  • Affiliations:

  • School of Information Technology and Electrical Engineering, The University of Queensland, 4067, AUSTRALIA;School of Information Technology and Electrical Engineering, The University of Queensland, 4067, AUSTRALIA;Dept. Elec. and Telecommuns. (IET), Norwegian Univ. of Science and Technology (NTNU), Norway;Wireless Technologies Laboratory, CSIRO ICT Centre, NSW 2113, AUSTRALIA

  • Venue:
  • ICASSP '09 Proceedings of the 2009 IEEE International Conference on Acoustics, Speech and Signal Processing
  • Year:
  • 2009

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Abstract

We propose a new algorithm for noncoherent sequence detection of M-ary phase-shift-keying (M-PSK) symbols transmitted over a block fading channel. The algorithm is of complexity O(T), where T is the sequence length, and is therefore computationally superior to existing maximum-likelihood (ML) detectors of complexity O(T logT). Our detector is based on a new approximation we propose to the noncoherent ML function. We show that by using this close approximation, the detection problem reduces to a nearest lattice point problem for the lattice An*, from which we derive our O(T) approach. Simulation results are provided that show the difference in bit error rate is negligibly small for a wide range of signal-to-noise ratios.