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Adaptive interference cancellation for transmitter distortion calibration in multi-antenna transmitters

  • US 8,615,204 B2
  • Filed: 08/26/2011
  • Issued: 12/24/2013
  • Est. Priority Date: 08/26/2011
  • Status: Expired due to Fees
First Claim
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1. A wireless communication device configured to calibrate one transceiver chain that is transmitting a first output signal while another transceiver chain is concurrently transmitting a second output signal, comprising:

  • a first transceiver chain including a first transmit circuit and a first receive circuit coupled in parallel between a core logic and a first antenna, the first transceiver chain further including a loopback path configured to route the first output signal as a loopback calibration signal from the first transmit circuit directly to the first receive circuit;

    a second transceiver chain including a second transmit circuit and a second receive circuit coupled in parallel between the core logic and a second antenna, wherein the second transceiver chain transmits the second output signal via the second antenna while the first transceiver chain transmits the first output signal via the first antenna; and

    an interference processor connected between the second transmit circuit and the first receive circuit, wherein the interference processor is configured to process the second output signal to generate a compensation signal that eliminates, from the loopback calibration signal, unwanted components of the second output signal received by the first antenna.

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