发明授权
- 专利标题: Methods and apparatus for suppressing strong-signal interference in low-IF receivers
- 专利标题(中): 抑制低中频接收机强信号干扰的方法和装置
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申请号: US12147962申请日: 2008-06-27
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公开(公告)号: US08055234B2公开(公告)日: 2011-11-08
- 发明人: Sven Mattisson , Paul Wilkinson Dent
- 申请人: Sven Mattisson , Paul Wilkinson Dent
- 申请人地址: SE Stockholm
- 专利权人: Telefonaktiebolaget LM Ericsson (publ)
- 当前专利权人: Telefonaktiebolaget LM Ericsson (publ)
- 当前专利权人地址: SE Stockholm
- 代理机构: Coats & Bennett, P.L.L.C.
- 主分类号: H04B1/16
- IPC分类号: H04B1/16
摘要:
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.
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