Mobile telephone messaging by baseband envelope modulation
First Claim
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1. A method for communicating messages using a radio signal, comprising:
- transmitting a radio signal according to an air interface standard for wireless radio communications by a transmitter, where the transmitter is either a mobile telephone or a base station;
modulating a carrier of the transmitted radio signal while maintaining compliance with the air interface standard to send a first message to a first receiver compliant with the air interface standard, where the first receiver is either a base station if the transmitter is a mobile telephone, or a mobile telephone if the transmitter is a base station;
modulating a baseband envelope of the transmitted radio signal while maintaining compliance with the air interface standard to send a second message to a second receiver, where the second receiver is a baseband envelope detector, the modulating of the carrier occurs concurrently with the modulating of the baseband envelope, and the second message contains an identification of the mobile telephone; and
adjusting a sensitivity of the second receiver to require the transmitter to be within a predetermined distance of the second receiver.
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Abstract
A method and system communicates messages using a radio signal. The radio signal is transmitted according to an air interface standard for wireless radio communications. A baseband envelope of the transmitted radio signal is modulated while maintaining compliance with the air interface standard to encode a message in the radio signal. A receiver demodulates the baseband envelope to decode the message. The transmitter and receiver can be part of a cellular telephone network including mobile telephones and base stations.
24 Citations
27 Claims
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1. A method for communicating messages using a radio signal, comprising:
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transmitting a radio signal according to an air interface standard for wireless radio communications by a transmitter, where the transmitter is either a mobile telephone or a base station; modulating a carrier of the transmitted radio signal while maintaining compliance with the air interface standard to send a first message to a first receiver compliant with the air interface standard, where the first receiver is either a base station if the transmitter is a mobile telephone, or a mobile telephone if the transmitter is a base station; modulating a baseband envelope of the transmitted radio signal while maintaining compliance with the air interface standard to send a second message to a second receiver, where the second receiver is a baseband envelope detector, the modulating of the carrier occurs concurrently with the modulating of the baseband envelope, and the second message contains an identification of the mobile telephone; and adjusting a sensitivity of the second receiver to require the transmitter to be within a predetermined distance of the second receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification