Methods and systems for communicating information using separabl

Details Methods and systems for communicating information using separabl Methods and systems for communicating information using separabl

1997-09-24

2000-06-20

Bocure, Tesfaldet

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375298, 375341, H04L 512, H04L 2704, H04L 2706

Patent

active

060786264

ABSTRACT:
A source set of bits is modulated according to a modulation constellation to produce a modulated communications signal, wherein the modulation constellation preferably is Gray-coded and is selected to provide a communications signal from the source set of bits such that real and imaginary components of the communications signal map to mutually exclusive first and second subsets of the source set of bits. The modulated communications signal is communicated over a communications channel. Soft information for the first subset of bits of the source set of bits is determined from a real component of a product of a channel transfer characteristic and the communicated modulated signal, the channel transfer characteristic characterizing communications over the communications channel. Soft information for the second subset of bits of the source set of bits is determined from an imaginary component of the product of the channel transfer characteristic and the communicated modulated signal. Iterative aspects for higher-order modulation and demodulation are also provided. Related systems and apparatus are also described.

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patent: 5809083 (1998-09-01), Wright
Zehavi, "8-PSK Trellis Codes for a Rayleigh Channel", IEEE Transactions on Communications, vol. 40, No. 5, May 1992, pp. 873-883.
Le Goff et al., "Turbo-Codes and High Spectral Efficiency Modulation", IEEE, 1994, pp. 645-649.

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