Rejection of transmit signal leakage in wireless...

H - Electricity – 04 – B

Patent

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H04B 1/52 (2006.01)

Patent

CA 2680521

This disclosure describes techniques for reducing adverse effects of transmit signal leakage in a full-duplex, wireless communication system. The disclosure describes techniques for reducing adverse effects of second order distortion and cross-modulation distortion of transmit signal leakage from a transmitter via a duplexer. The techniques may be effective in rejecting at least a portion of a transmit leakage signal, thereby reducing or eliminating distortion. The adaptive filter may include an estimator circuit that generates a transmit leakage signal estimate. A summer subtracts the estimate from the received signal to cancel transmit leakage and produce an output signal. The estimator circuit generates the transmit leakage signal estimate based on a reference signal and feedback from the output signal. The reference signal approximates the carrier signal used to generate the transmit signal in the transmitter. The reference signal may be provided by the same oscillator used to produce the transmit carrier signal.

L'invention concerne des techniques permettant de réduire des effets contraires d'une fuite de signaux de transmission dans un système de communications sans fil en duplex intégral. L'invention concerne des techniques permettant de réduire des effets contraires d'une distorsion de second ordre et d'une distorsion de transmodulation d'une fuite de signaux de transmission via un duplexeur. Ces techniques peuvent être efficaces en matière de rejet d'au moins une partie d'un signal de fuite de transmission, ce qui réduit ou élimine la distorsion. Le filtre adaptatif peut comporter un circuit estimateur qui génère une estimation du signal de fuite de transmission. Un sommateur soustrait l'estimation du signal reçu pour annuler la fuite de transmission et produire un signal de sortie. Le circuit estimateur génère l'estimation du signal de fuite de transmission sur la base d'un signal de référence et d'une rétroaction à partir du signal de sortie. Le signal de référence peut être produit par le même oscillateur utilisé pour produire le signal de porteuse de transmission.

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