System and method for collection of transmission characteristics
First Claim
1. A system for the collection of transmission characteristics for authentication of a cellular telephone transmitter of a cellular telephone, the system comprising:
- an enclosure sized to accept the cellular telephone;
a transmitter capable of operating at frequencies used for cellular telephone communication;
a receiver capable of operating at frequencies used for cellular telephone communication, said receiver receiving signals from the cellular telephone when in said enclosure and generating receiver output signals representative of said received signals;
an antenna coupled to said transmitter and said receiver and extending into said enclosure, said antenna coupling radio frequencies transmitted by said transmitter to said enclosure and receiving radio frequencies emanating from the cellular telephone when in said enclosure, said antenna coupling said received radio frequencies to said receiver; and
a processor to control said transmitter and cause said transmitter to transmit signals to said enclosure to elicit a transmission response signal from the cellular telephone when in said enclosure, said processor receiving from said receiver output signals indicative of a transmission characteristic of the cellular telephone when in said enclosure and responding to said transmit signals from said transmitter.
1 Assignment
0 Petitions
Accused Products
Abstract
A system and method for collecting fingerprint reference wave forms under controlled conditions includes a radio frequency (RF) enclosure designed to receive a cellular telephone. A control system, including a transmitter and receiver provides RF communications with a cellular phone placed in the enclosure. A processor controls operation of the transmitter and receiver. The processor sends commands to the cellular phone in the enclosure using the transmitter. The transmitted commands are selected to elicit a RF transmission from the cellular phone in response to the command. The receiver detects the response from the cellular telephone and generates a reference wave form indicative of the transmission characteristics of the transmitter of the cellular phone in the enclosure. The processor captures one or more reference waveforms that can be used to generate a fingerprint indicative of a transmission characteristic of the transmitter of the cellular telephone. In addition, the system can include an external power supply and temperature control system to vary the voltage level of power supplied to the cellular telephone in the enclosure and to vary the temperature in the enclosure. By varying the operating voltage and temperature, the processor can collect reference waveforms under a variety of operating conditions. In addition, the processor can select the carrier frequency for the cellular telephone and for the transmitter and receiver of the control system. Furthermore, the processor can vary the transmit power of the system transmitter and the transmit power of the transmitter within the cellular telephone itself. The system is sized to be readily moved from one location to another to permit the simple collection of reference waveforms under a variety of controlled conditions.
120 Citations
39 Claims
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1. A system for the collection of transmission characteristics for authentication of a cellular telephone transmitter of a cellular telephone, the system comprising:
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an enclosure sized to accept the cellular telephone; a transmitter capable of operating at frequencies used for cellular telephone communication; a receiver capable of operating at frequencies used for cellular telephone communication, said receiver receiving signals from the cellular telephone when in said enclosure and generating receiver output signals representative of said received signals; an antenna coupled to said transmitter and said receiver and extending into said enclosure, said antenna coupling radio frequencies transmitted by said transmitter to said enclosure and receiving radio frequencies emanating from the cellular telephone when in said enclosure, said antenna coupling said received radio frequencies to said receiver; and a processor to control said transmitter and cause said transmitter to transmit signals to said enclosure to elicit a transmission response signal from the cellular telephone when in said enclosure, said processor receiving from said receiver output signals indicative of a transmission characteristic of the cellular telephone when in said enclosure and responding to said transmit signals from said transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A system for the collection of transmission characteristics for authentication of a cellular telephone transmitter of a cellular telephone having a keypad operable by the user of the cellular telephone and a keypad connector for remote operation of the keypad, the system comprising:
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an enclosure sized to accept the cellular telephone; a receiver capable of operating at frequencies used for cellular telephone communication, said receiver receiving signals from the cellular telephone when in said enclosure and generating receiver output signals representative of said received signals; an antenna coupled to said receiver and extending into said enclosure, said antenna receiving radio frequencies emanating from the cellular telephone when in said enclosure and coupling said received radio frequencies to said receiver; a cellular telephone adapter capable of electrical connection to the keypad connector of the cellular telephone when inside said enclosure; and a processor generating keypad commands for simulated user operation of the cellular telephone when in said enclosure, said processor providing said keypad commands to the keypad using said cellular telephone adapter to elicit a transmission response signal from the cellular telephone when in said enclosure, said processor receiving from said receiver output signals indicative of a transmission characteristic of the cellular telephone when in said enclosure and responding to said keypad commands from said processor. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method for the collection of transmission characteristics for authentication of a cellular telephone transmitter of a cellular telephone wherein the cellular telephone has a keypad operable by the user of the cellular telephone and a keypad connector for remote operation of the keypad, the method comprising:
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placing the cellular telephone in an enclosure sized to accept the cellular telephone; coupling a cellular telephone adapter to the keypad connector of the cellular telephone when inside said enclosure; generating keypad commands for simulated user operation of the cellular telephone when in said enclosure; eliciting a transmission response signal from the cellular telephone by providing said keypad commands to the keypad using said cellular telephone adapter, wherein said step of eliciting said transmission response signal is performed by said keypad commands; receiving said transmission response signal from the cellular telephone when in said enclosure and generating receiver output signals representative of said received transmission response signal; and determining from said receiver output signals a transmission characteristic of the cellular telephone when in said enclosure and responding to said step of eliciting said transmission response signal. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39)
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Specification