Method and apparatus for canceling spread-spectrum noise

H - Electricity – 04 – B

Patent

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H04B 1/10 (2006.01) H04B 1/707 (2006.01)

Patent

CA 2116127

A spread-spectrum noise canceller (182) is provided. A received phase and a received amplitude for a first (216) and a second (236) component of a received spread-spectrum signal (200) is determined. The second component (236) is structurally similar to the first component (216), but differs by being received at a different time, being transmitted along a different path, or having a different phase. In addition, the spread-spectrum signal (200) includes a first and a second known signal. A portion of a spread-spectrum noise signal in the received signal (200) is canceled by generating an estimated signal (270) by spreading (260) the second known signal at the second component received phase (224) with the first known signal at the first component received phase (204) and adjusting a gain (268) of an integrated form of the spread second known signal as a function of the received amplitudes of the first (216) and the second (236) components. Subsequently, the second known signal is processed out of the received spread-spectrum signal (200) by subtracting (166) the estimated signal (270) from a demodulated form (216, 236) of the received spread-spectrum signal (200).

L'invention concerne un dispositif de suppression (182) du bruit d'étalement du spectre. Ce dispositif consiste à déterminer une phase reçue et une amplitude reçue pour une première (216) et une seconde (236) composante d'un signal (200) à étalement du spectre reçu. La seconde composante (236) présente une structure similaire à celle de la première composante (216), mais elle est différente dans le sens où elle est reçue à un moment différent, où elle est transmise le long d'une voie différente et où elle possède une phase différente. De plus, le signal (200) à etalement du spectre comprend un premier et un second signal connus. On supprime une partie du signal du bruit d'étalement du spectre dans le signal reçu (200) en générant un signal estimé (270) par étalement (260) du second signal connu au niveau de la phase reçue de la seconde composante (224) avec le premier signal connu au niveau de la phase reçue de la première composante (204) et en réglant le gain (268) d'une forme intégrée du second signal connu étalé en fonction des amplitudes reçues des première (216) et seconde (236) composantes. Par la suite, on traite le signal à étalement du spectre reçu (200) pour en extraire le second signal connu en soustrayant (166) le signal estimé (270) d'une forme démodulée (216, 236) du signal à étalement de spectre reçu (200).

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