Synchronizing a radio frequency transmit message with an asynchronous radio frequency receive message
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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Abstract
The present invention relates to synchronization circuitry that is used to synchronize an asynchronous received RF message with a transmitted RF message. In one embodiment of the present invention, the synchronization circuitry includes at least one counter, which is used to associate timing of the asynchronous received RF message with a receive count value, and associate timing of the transmitted RF message with a transmit count value. A time delay between occurrence of the receive count value and the transmit count value provides accurate timing for the start of the transmitted RF message.
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Citations
24 Claims
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1. A method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A radio frequency (RF) communications system comprising:
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an RF transceiver adapted to; receive an RF signal having an asynchronous receive RF message; provide the asynchronous receive RF message to synchronization circuitry; receive a synchronized transmit RF message; and transmit an RF signal having the synchronized transmit RF message; and
the synchronization circuitry adapted to;receive the asynchronous receive RF message; synchronize the asynchronous receive RF message to create a synchronized receive RF message using a receive count value; obtain an estimated receive time of a receive slot boundary in the synchronized receive RF message; obtain a transmit RF message; synchronize the transmit RF message with the estimated receive time using a transmit count value to create the synchronized transmit RF message; and provide the synchronized transmit RF message, wherein a time delay between occurrence of the receive count value and the transmit count value provides accurate timing for transmission of the synchronized transmit RF message; down convert the received asynchronous RF message to create a received asynchronous baseband message; synchronize the received asynchronous baseband message using the receive count value to provide a synchronized received asynchronous baseband message; estimate the receive time of the receive slot boundary in the synchronized received asynchronous baseband message; form a baseband transmit message; synchronize the baseband transmit message with the receive time using the transmit count value to provide a synchronized baseband transmit message; and modulate an RF carrier signal using the synchronized baseband transmit message to create the synchronized RF transmit message. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification