Invention Grant
- Patent Title: Methods and apparatus for suppressing strong-signal interference in low-IF receivers
- Patent Title (中): 抑制低中频接收机强信号干扰的方法和装置
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Application No.: US12147962Application Date: 2008-06-27
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Publication No.: US08055234B2Publication Date: 2011-11-08
- Inventor: Sven Mattisson , Paul Wilkinson Dent
- Applicant: Sven Mattisson , Paul Wilkinson Dent
- Applicant Address: SE Stockholm
- Assignee: Telefonaktiebolaget LM Ericsson (publ)
- Current Assignee: Telefonaktiebolaget LM Ericsson (publ)
- Current Assignee Address: SE Stockholm
- Agency: Coats & Bennett, P.L.L.C.
- Main IPC: H04B1/16
- IPC: H04B1/16

Abstract:
Circuits and methods are disclosed for compensating for received signal distortion caused by non-linearities in the receiver circuitry. An exemplary receiver circuit includes a distortion waveform generator configured to approximate one or more non-linear response characteristics of a downconverter circuit used to downconvert the received radio frequency signal. The estimated distortion waveform thus produced is filtered, using a filter or filters substantially similar to those used for filtering an intermediate frequency signal that includes the desired signal and non-linear distortion products caused by strong interfering signals. The filtered estimated distortion waveform and the intermediate frequency are sampled, to obtain a sampled distortion signal and a sampled signal of interest. The sampled distortion signal is scaled, and subtracted from the sampled signal of interest to obtain reduced-interference signal samples. In some embodiments, the scaling factor is determined by correlating the sampled signal of interest with the sampled distortion signal.
Public/Granted literature
- US20090325518A1 Methods and Apparatus for Suppressing Strong-Signal Interference in Low-IF Receivers Public/Granted day:2009-12-31
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