Reduction of second-order distortion caused by transmit...

H - Electricity – 04 – B

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H04B 1/52 (2006.01)

Patent

CA 2679576

This disclosure describes techniques for reducing adverse effects of TX signal leakage in a full-duplex, wireless communication system. In particular, the disclosure describes techniques for reducing adverse effects of second order distortion of TX signal leakage. To reduce or eliminate second order distortion of transmit signal leakage, a wireless device squares a combined signal that carries both a desired RX signal and a TX leakage signal. For example, the device may include a device that exhibits a strong, second order nonlinearity to, in effect, square the combined signal. The device subtracts the squared signal from the output of the mixer in the receive path, cancelling out at least some of the second-order distortion caused by the mixer. In this manner, the device can reduce the adverse effects of second order distortion of TX signal leakage, and thereby enhance or maintain receiver sensitivity.

L'invention concerne des techniques permettant de réduire des effets contraires d'une fuite de signaux TX dans un système de communications sans fil en duplex intégral. Plus précisément, l'invention concerne des techniques permettant de réduire des effets contraires de distorsion de second ordre d'une fuite de signaux TX. Pour réduire ou pour éliminer la distorsion de second ordre d'une fuite de signaux de transmission, un dispositif sans fil égalise un signal combiné qui transporte aussi bien un signal RX recherché qu'un signal de fuite TX. Par exemple, le dispositif peut comporter un dispositif qui présente une forte non linéarité de second ordre pour, en fait, égaliser le signal combiné. Le dispositif ôte le signal égalisé du produit du mélangeur dans le trajet de réception, annulant au moins une certaine distorsion de second ordre provoquée par le mélangeur. Ainsi, le dispositif peut réduire les effets contraires de la distorsion de second ordre d'une fuite de signaux TX, ce qui renforce ou conserve la sensibilité du récepteur.

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