Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1994-12-05
1996-12-03
Bocure, Tesfaldet
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
375298, 375340, H04L 512, H04L 2302, H04L 2706, H04L 2704
Patent
active
055815782
ABSTRACT:
Known in a digital communication system (1) are phase recovery methods for QPSK modulated signals. It is proposed to extend such methods to multi-resolution QAM signals, which can be represented by rotationally invariant signal constellations. To this end, with each received symbol (r.sub.i), a phase reference (.phi..sub.i) for a high priority-bit (HP-bits) constellation is determined, and with respect to this phase reference (.phi..sub.i), a sub-constellation (CLx) for low-priority bits (LP-bits) is constructed, the sub-constellation (CLx) being rotationally invariant. The sub-configuration (CLx) is translated to an origin (O) of the signal constellation, and then the low priority-bits (LP-bits) are determined by determining a minimum squared Euclidean distance (Ed) of the rotated and translated received symbol (b.sub.i ') with respect to the rotated and translated sub-constellation. For a 2R(2,2)-QAM signal constellation a simple detection method is thus provided. The method can be made adaptive, and can also be made recursive for more complicated signal constellations such as a 64-QAM signal constellation.
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"Digital Communication", by Edward A. Lee et al, pp. 167-172; 184-186; 198-206.
Barschall Anne E.
Bocure Tesfaldet
U.S. Philips Corporation
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