Reduced complexity detection of shaped offset QPSK

  • Authors:

  • Tom Nelson;Michael Rice

  • Affiliations:

  • Department of Electrical and Computer Engineering, Brigham Young University, Provo, UT;Department of Electrical and Computer Engineering, Brigham Young University, Provo, UT

  • Venue:
  • MILCOM'06 Proceedings of the 2006 IEEE conference on Military communications
  • Year:
  • 2006

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Abstract

Shaped offset QPSK (SOQPSK) is a constant envelope, bandwidth efficient modulation that has been adopted into the standard for aeronautical telemetry channels. Due to the memory inherent in this modulation, the optimum detector for it requires a trellis and consequently has fairly high complexity. In this paper we explore the bit error rate performance of reduced complexity detectors for SOQPSK. We show that for SOQPSK a factor of 128 reduction in the number of trellis states of the detector can be achieved with a loss of only 0.2 dB in bit error rate performance.