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LMS Adaptive Filter for Digital Cancellation of Second Order Inter-Modulation Due to Transmitter Leakage

  • US 20080232268A1
  • Filed: 03/21/2008
  • Published: 09/25/2008
  • Est. Priority Date: 03/21/2007
  • Status: Active Grant
First Claim
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1. A digital transmit-signal IM2 canceller for a portable handset that operates in a full-duplex mode, the digital transmit-signal canceller, comprising:

  • a delay estimator arranged to receive a first input from a receive channel and a second input from a transmit channel of the handset and generates an estimate of the second-order inter-modulation that the transmit channel introduces in the receive channel; and

    a digital signal adjuster arranged to receive and remove the estimate of the second-order inter-modulation from the receive channel before forwarding a modified signal to a baseband subsystem of the portable handset.

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