Wireless receiver with notch filter to reduce effects of transmit signal leakage

A notch filter and receiver technology, applied in transmission systems, electrical components, etc., can solve problems such as TX leakage and RX signal degradation

Active Publication Date: 2010-01-27
QUALCOMM INC
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  • Abstract
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Problems solved by technology

However, even with filtering, a residual amount of TX leakage may still be left, causing degradation of the desired RX signal

Method used

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  • Wireless receiver with notch filter to reduce effects of transmit signal leakage
  • Wireless receiver with notch filter to reduce effects of transmit signal leakage
  • Wireless receiver with notch filter to reduce effects of transmit signal leakage

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Embodiment Construction

[0019] This disclosure describes techniques for reducing the adverse effects of TX signal leakage in full-duplex wireless communication devices. The techniques utilize notch filters to exclude TX signal leakage in signals processed in the RX path of a wireless communication device. The notch filter may be constructed as a composite notch filter comprising a resistor and capacitor assembly arranged to attenuate TX signal leakage components of the desired signal near the selected notch frequency.

[0020] A notch filter can be applied to the down-converted baseband signal produced by the passive mixer. The received signal can be amplified by a low noise amplifier before being down-converted by a mixer. The notch filter may be configured to provide a notch frequency that approximates the offset frequency of the TX leakage signal component relative to the desired RX signal at baseband (eg, dc). Using a notch filter with a notch approximately at the TX to RX offset frequency can ...

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Abstract

This disclosure describes techniques for reducing adverse effects of TX signal leakage in a full-duplex, wireless communication device. The techniques make use of a notch filter to reject TX signal leakage in a signal processed in the RX path of the wireless communication device. The notch filter may be constructed as a complex notch filter using passive resistor and capacitor components to produce a notch frequency that attenuates TX signal leakage components in a desired signal. The notch filter may be applied to a down-converted, baseband signal produced by a passive mixer.

Description

[0001] This application claims No. 60 / 2007 of the March 13, 2007 application entitled "High-Linearity Receiver Using Notch at Tx to Rx Offset Frequency" (High-Linearity Receiver Using Notch at Tx to Rx Offset Frequency) The benefit of Provisional Patent Application No. 894,546, which is hereby incorporated by reference in its entirety. technical field [0002] The present invention relates generally to wireless communication devices, and more particularly, to techniques for reducing the adverse effects of transmit signal leakage in wireless full-duplex communication systems. Background technique [0003] Wireless devices in a full-duplex communication system can transmit and receive signals simultaneously to support two-way communication. In the transmit path, a power amplifier amplifies a radio frequency (RF) signal for transmission. A transmit (TX) signal is routed through a duplexer and transmitted via an antenna. In the receive path, a desired receive (RX) signal is re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/52H04B1/10
CPCH04B1/525H04B1/1036H04B1/10H04B1/50
Inventor 张璃琼普拉萨德·S·古德曼乔斯·卡巴尼拉斯
Owner QUALCOMM INC
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