On TCM schemes transparent to constant phase and frequency shifts

Author

Liu, Yow-Jong ; Biglieri, Ezio

Author_Institution

GTE Lab., Waltham, MA, USA

fYear

1990

fDate

30 Sep-3 Oct 1990

Firstpage

384

Abstract

The problem of digital transmission over a channel with phase ambiguity generated by a constant phase shift or (Doppler) frequency shift is considered. To remove this phase ambiguity differential encoding/decoding techniques are used in systems with combined modulation and coding, provided that the transmitted sequence is transparent to the phase rotations of the signal space. Necessary and sufficient conditions for a trellis-coded modulation (TCM) scheme to be fully transparent rotationally invariant are derived. Procedures for the design of fully transparent phase-invariant trellis codes (PIC), Doppler-invariant trellis codes (DIC), and phase/Doppler-invariant trellis codes (PDIC) are proposed. Examples are given to clarify the design procedures

Keywords

Doppler effect; decoding; encoding; modulation; telecommunication channels; Doppler frequency shift; Doppler-invariant trellis codes; TCM; channel; coding; constant frequency shift; constant phase shift; differential decoding; differential encoding; digital transmission; modulation; necessary conditions; phase ambiguity; phase rotations; phase/Doppler-invariant trellis codes; signal space; sufficient conditions; transparent phase-invariant trellis codes; trellis-coded modulation; Convolutional codes; Decoding; Digital modulation; Doppler shift; Frequency synchronization; Laboratories; Modulation coding; Phase modulation; Power system reliability; Sufficient conditions;

fLanguage

English

Publisher

ieee

Conference_Titel

Military Communications Conference, 1990. MILCOM '90, Conference Record, A New Era. 1990 IEEE

Conference_Location

Monterey, CA

Type

conf

DOI

10.1109/MILCOM.1990.117447

Filename

117447