Patent
Data communication system and method therefor
TLDR
The P-APSK constellation (70, 70') has an even number of phase point rings (74, 76) and equal numbers of phase points (72) in pairs of the rings as discussed by the authors.Abstract:
A digital communication system (20) communicates using a polar amplitude phase shift keyed (P-APSK) phase point constellation (70, 70'). Pragmatic encoding and puncturing is accommodated. The pragmatic encoding uses the P-APSK constellation (70, 70') to simultaneously communicate both encoded and uncoded information bits. The P-APSK constellation (70, 70') has an even number of phase point rings (74, 76) and equal numbers of phase points (72) in pairs of the rings (74, 76). Encoded bits specify secondary modulation and uncoded bits specify primary modulation. The constellation (70, 70') is configured so that secondary modulation sub-constellations (78) include four phase points (72) arranged so that two of the four phase points (72) exhibit two phase angles at one magnitude and the other two of the four phase points exhibit phase angles that are at another magnitude. The difference between the phase angles at different magnitudes within a secondary sub-constellation (78) is constant.read more
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References
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Journal ArticleDOI
A pragmatic approach to trellis-coded modulation
TL;DR: This pragmatic approach to all coding applications permits the use of a single basic coder and decoder to achieve respectable coding (power) gains for bandwidth efficiencies from 1 b/s/Hz to 6 b/S/Hz.
Journal ArticleDOI
Digital Amplitude-Phase Keying with M-Ary Alphabets
C. Thomas,M. Weidner,S. Durrani +2 more
TL;DR: Modem implementation methods, including carrier phase reconstruction techniques, are discussed for basic APK designs and the effects of AM-AM and AM-PM distortion on APK are presented as a function of power backoff for single-carrier operation.
Patent
Apparatus and method for communicating digital data using trellis coded QAM with punctured convolutional codes
TL;DR: In this paper, a trellis coded QAM is used for transmission using a rate 1/2 convolutional encoder punctured to rate 2/3, and two sets of branch metrics are computed for each received symbol.
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Mode selective quadrature amplitude modulation communication system
TL;DR: In this paper, a receiver detects the particular QAM mode transmitted on a trial and error basis, by attempting to decode the received data using different QAM modes until a synchronization condition is detected.
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Method and apparatus for resolving phase ambiguities in trellis coded modulated data
TL;DR: In this paper, a codec for resolving transmission phase ambiguities in the M-ary PSK modulation of trellis coded data is proposed, which uses a differential encoder and a convolutional encoder along with multiplexed differential encoders.