Joint source-channel coding for multi-carrier modulation

G - Physics – 01 – V

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G01V 3/00 (2006.01) C08C 19/16 (2006.01) H04H 9/00 (2006.01) H04N 7/173 (2006.01)

Patent

CA 2577811

Methods and systems employing combined source-channel coding for multi-carrier modulation (MCM) (502). In some embodiments, a described method coprises: estimating channel gain to noise ratio (CGNR) as a function of frequency bin (510); determining MCM parameters that minimize distortion of one or more telemetry signals; generating a communications signal using the MCM parameters, and transmitting the communications signal via a communications channel (504). The MCM parameters may be determined by minimizing a telemetry signal distortion measure subject to CGNR and a transmit power constraint (514). The MCM parameters may further account for differing fidelity requirements when multiple telemetry signals are being transmitted (S(t)).

L'invention concerne des systèmes et des procédés à codage de canal source commun pour modulation multiporteuse (MCM). Selon certaines variantes, le procédé décrit comporte les étapes suivantes: estimation de rapport gain/bruit de canal (CGNR) en fonction d'un secteur de fréquences ; détermination des paramètres MCM qui permettent de réduire au minimum la distorsion d'un ou plusieurs signaux de télémesure ; production d'un signal de communications sur la base des paramètres MCM, et transmission de ce signal via un canal de communications. On peut déterminer les paramètres MCM en réduisant au minimum une mesure de distorsion de signal de télémesure sous réserve d'une valeur de CGNR et d'une contrainte de puissance d'émission. Enfin, les paramètres MCM peuvent refléter différents besoins de fidélité en cas de transmission de plusieurs signaux de télémesure.

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