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Adaptive Filter, Wireless Apparatus, Apparatus and Method for Suppressing Transmit Leakage Signals

A technology of adaptive filter and leakage signal, which is applied in the direction of electrical components and transmission systems, and can solve the problems of increasing the cost of wireless devices

Active Publication Date: 2016-01-20
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Third, the SAW filter and its impedance matching circuit increase the cost of the wireless device

Method used

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  • Adaptive Filter, Wireless Apparatus, Apparatus and Method for Suppressing Transmit Leakage Signals
  • Adaptive Filter, Wireless Apparatus, Apparatus and Method for Suppressing Transmit Leakage Signals
  • Adaptive Filter, Wireless Apparatus, Apparatus and Method for Suppressing Transmit Leakage Signals

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Embodiment Construction

[0021] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs.

[0022] The adaptive filter described herein can be used in various wireless full-duplex communication systems. These adaptive filters are also available in various frequency bands such as cellular from 824 to 894MHz, personal communication systems (PCS) from 1850 to 1990MHz, digital cellular systems (DCS) from 1710 to 1880MHz, 2170MHz International Mobile Telecommunications 2000 (IMT-2000) frequency band and so on. For clarity, the following description is for cellular frequency bands, which include (1) the uplink frequency band from 824 to 849 MHz and (2) the downlink frequency band from 869 to 894 MHz. The uplink and downlink frequency bands are the transmit (TX) and receive (RX) frequency bands of the wireless devic...

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Abstract

An adaptive filter suitable for fabrication on an RF integrated circuit and used for transmit (TX) leakage rejection in a wireless full-duplex communication system is described. The adaptive filter includes a summer and an adaptive estimator. The summer receives an input signal having a TX leakage signal and an estimator signal having an estimate of the TX leakage signal, subtracts the estimator signal from the input signal, and provides an output signal having the TX leakage signal attenuated. The adaptive estimator receives the output signal and a reference signal having a version of the transmit signal, estimates the TX leakage signal in the input signal based on the output signal and the reference signal, and provides the estimator signal. The adaptive estimator may utilize an LMS algorithm to minimize a mean square error between the TX leakage signal in the input signal and the TX leakage signal estimate in the estimator signal.

Description

[0001] This application claims priority to U.S. Provisional Application No. 60 / 519,561, filed November 13, 2003, and assigned to the assignee of the present invention, entitled "ADAPTIVE FILTERINGOFTXLEAKAGE INCDMARECEIVERS," which for all purposes is Incorporated herein by reference in its entirety. technical field [0002] The present invention relates generally to electronic components, and more particularly to techniques for mitigating the deleterious effects of transmit (TX) leakage signals in wireless full-duplex communication systems. Background technique [0003] Wireless devices in a wireless full-duplex communication system can simultaneously transmit and receive data for two-way communication. One such full-duplex system is a Code Division Multiple Access (CDMA) system. On the transmit path, a transmitter within a wireless device (1) modulates data onto a radio frequency (RF) carrier signal to produce an RF modulated signal, and (2) amplifies the RF modulated sig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/525
CPCH04B1/525
Inventor 弗拉迪米尔·阿帕林加里·约翰·巴兰坦查理·J·珀西科
Owner QUALCOMM INC
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