Abstract
The paper considers the problem of digital transmission over a channel with phase ambiguity generated either by a constant phase shift or a Doppler frequency shift. It is well known that differential encoding/decoding techniques can be used to remove the constant phase and Doppler frequency shift of the received sequence in an uncoded communication system. The same techniques can be used for a coded system, provided that the transmitted sequence is transparent to the phase rotations of the signal space caused by constant phase and Doppler frequency shift ambiguities. Necessary and sufficient conditions are derived for a trellis-coded modulation scheme to be fully transparent rotationally invariant and new procedures are proposed for the design of fully transparent phase-invariant trellis codes, Doppler-invariant trellis codes, and phase/Doppler-invariant trellis codes.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: IEE Proceedings I Communications, Speech and Vision
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
