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Synchronizing a radio frequency transmit message with an asynchronous radio frequency receive message

  • US 7,948,964 B1
  • Filed: 12/14/2007
  • Issued: 05/24/2011
  • Est. Priority Date: 12/14/2006
  • Status: Active Grant
First Claim
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1. A method comprising:

  • receiving an asynchronous radio frequency (RF) message;

    synchronizing the received asynchronous RF message using a receive count value to provide a synchronized received asynchronous RF message;

    estimating a receive time of a receive slot boundary in the synchronized received asynchronous RF message;

    forming an RF transmit message;

    synchronizing the RF transmit message with the receive time using a transmit count value to provide a synchronized RF transmit message; and

    transmitting the synchronized RF transmit message, wherein a time delay between occurrence of the receive count value and the transmit count value provides accurate timing for the start of the transmitting the synchronized RF transmit message;

    down converting the received asynchronous RF message to create a received asynchronous baseband message;

    synchronizing the received asynchronous baseband message using the receive count value to provide a synchronized received asynchronous baseband message;

    estimating the receive time of the receive slot boundary in the synchronized received asynchronous baseband message;

    forming a baseband transmit message;

    synchronizing the baseband transmit message with the receive time using the transmit count value to provide a synchronized baseband transmit message; and

    modulating an RF carrier signal using the synchronized baseband transmit message to create the synchronized RF transmit message.

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