ROBUST RADIO FREQUENCY SIGNALS
First Claim
1. A method of communicating radio frequency signals between a transmitter and a receiver comprising the steps of:
- a) learning an identification code corresponding to a transmitter and storing the identification code in a receiver;
b) transmitting a signal with the transmitter that includes a checksum value determined without the identification code;
c) receiving the signal with the receiver and combining data from the learned identification code to the checksum value; and
d) verifying the signal responsive to the combination of the learned identification code and the checksum value resulting in an expected value.
2 Assignments
0 Petitions
Accused Products
Abstract
A tire pressure monitoring system includes a receiver for processing signals and alerting an operator of the vehicle should conditions within any of the tires fall outside a desired range. The transmitters within the tires emit shorter transmission signals during operation by eliminating transmission of the identification code. The receiver stores the identifier for each transmitter for comparison to subsequent transmissions. Subsequent transmissions do not include the identifier. The receiver combines the saved identifier with the value provided in the check portion of the incoming transmission. If the combination of the saved identifier with the value provided in the check portion meets a defined criteria, than the signal is recognized as originating from one of the transmitters.
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Citations
15 Claims
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1. A method of communicating radio frequency signals between a transmitter and a receiver comprising the steps of:
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a) learning an identification code corresponding to a transmitter and storing the identification code in a receiver; b) transmitting a signal with the transmitter that includes a checksum value determined without the identification code; c) receiving the signal with the receiver and combining data from the learned identification code to the checksum value; and d) verifying the signal responsive to the combination of the learned identification code and the checksum value resulting in an expected value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of verifying the veracity of a radio frequency signal transmitting data from a transmitter to a receiver, the method comprising the steps of:
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a) transmitting a data signal including data indicative of measured parameter and an identification code; b) generating a checksum value by performing a byte-wise exclusive OR on the identification code and the measured parameter bytes; and c) determining that the veracity of the transmission is true responsive to the identification code being validated by a receiver. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification