发明申请
US20080232268A1 LMS Adaptive Filter for Digital Cancellation of Second Order Inter-Modulation Due to Transmitter Leakage
有权
LMS自适应滤波器,用于由于发射机泄漏而进行二阶互调的数字消除
- 专利标题: LMS Adaptive Filter for Digital Cancellation of Second Order Inter-Modulation Due to Transmitter Leakage
- 专利标题(中): LMS自适应滤波器,用于由于发射机泄漏而进行二阶互调的数字消除
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申请号: US12052991申请日: 2008-03-21
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公开(公告)号: US20080232268A1公开(公告)日: 2008-09-25
- 发明人: Masoud Kahrizi , Jaleh Komaili , John E. Vasa
- 申请人: Masoud Kahrizi , Jaleh Komaili , John E. Vasa
- 申请人地址: US MA Woburn
- 专利权人: SKYWORKS SOLUTIONS, INC.
- 当前专利权人: SKYWORKS SOLUTIONS, INC.
- 当前专利权人地址: US MA Woburn
- 主分类号: H04J1/16
- IPC分类号: H04J1/16
摘要:
A transmit signal second-order inter-modulation (IM2) canceller for a portable handset using a full duplex mode of operation (e.g., WCDMA) is used to controllably reduce IM2 introduced by a transmit signal that appears in a received signal in a receive channel of the portable handset. The transmit signal IM2 canceller includes a delay estimator and a digital signal adjuster. The delay estimator receives a first input from a receive channel and a second input from a transmit channel. The delay estimator generates an estimate of the IM2 that the transmit channel introduces in the receive channel. The digital signal adjuster removes the estimate of the IM2 before forwarding a modified receive channel signal to a baseband subsystem of the portable handset.