Bandwidth-efficient waveforms for line-of-sight communications

  • Authors:

  • Thomas L. Tapp;Richard A. Groshong

  • Affiliations:

  • Rockwell-Collins, Inc., Advanced Technology Engineering, Cedar Rapids, Iowa;Rockwell-Collins, Inc., Advanced Technology Engineering, Cedar Rapids, Iowa

  • Venue:
  • MILCOM'03 Proceedings of the 2003 IEEE conference on Military communications - Volume I
  • Year:
  • 2003

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Abstract

A family of power- and bandwidth-efficient waveforms, suitable for fading multipath channels is described. A relatively high rate serially-concatenated convolutional code is paired with either QAM or non-recursive partial-response CPM. When using CPM, the receiver employs a simplified soft-output demodulator. The performance and implementation impacts of multiple receiver architectures, including iterative demapping, interative demodulation, and iterative equalization are examined. A block equalizer is used to mitigate intersymbol interference effects. The waveform permits a relatively simple, yet flexible, receiver design, that achieves high performance in real-world channels. Performance and implementation considerations are discussed.