Adaptive M-PSK communications in the absence of channel gain estimation

Authors:
Athanasios S. Lioumpas;George K. Karagiannidis;Diomidis S. Michalopoulos
Affiliations:
Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, Thessaloniki, Greece;Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, Thessaloniki, Greece;Department of Electrical and Computer Engineering, The University of British Columbia, Vancouver, Canada
Venue:
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Year:
2009

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Abstract

We introduce a variable-rate (VR) M-PSK modulation scheme, for communications over fading channels, in the absence of channel gain estimation at the receiver. The choice of the constellation size is based on the signal-plus-noise (S+N) sampling value rather than on the signal-to-noise ratio (S/N). It is analytically shown that S+N can serve as an excellent simpler criterion, alternative to S/N, for determining the modulation order in VR systems. In this way, low complexity transceivers can use VR transmissions in order to increase their spectral efficiency under an error performance constraint.