Gain adjustment method in two-way communication systems
First Claim
Patent Images
1. A method of interrogating a portable RF transceiver, comprising the steps of:
- providing an interrogator RF transceiver;
establishing a minimum power level;
setting a current power level value equal to said minimum power level;
the interrogator transceiver transmitting an interrogation RF signal at said current power level;
after transmitting the interrogation signal, the interrogator transceiver waiting a period of time to receive a response RF signal;
the interrogator transceiver determining whether said period of time has elapsed without the interrogator transceiver receiving said response signal and, only if so, thenincreasing said current power level value, andrepeating the steps of the interrogator transceiver transmitting, waiting, and determining;
providing a portable RF transceiver which is substantially smaller and lighter than the interrogator transceiver;
the portable RF transceiver waiting to receive the interrogation RF signal; and
in response to receiving the interrogation signal, the portable transceiver transmitting the response RF signal.
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Abstract
A method for reducing the dynamic range required of a receiver circuit in a remote transceiver in 2-way communication between local and remote transceivers. By repeatedly transmitting a signal with successively increasing power from one transceiver until a response is received from the other transceiver, the dynamic range and hence complexity of the receiving circuit may be greatly reduced. The operating power of the remote transmitter can then be adjusted according to the level used by the local transmitter, thereby promoting the efficent use of the remote'"'"'s power supply.
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Citations
10 Claims
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1. A method of interrogating a portable RF transceiver, comprising the steps of:
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providing an interrogator RF transceiver; establishing a minimum power level; setting a current power level value equal to said minimum power level; the interrogator transceiver transmitting an interrogation RF signal at said current power level; after transmitting the interrogation signal, the interrogator transceiver waiting a period of time to receive a response RF signal; the interrogator transceiver determining whether said period of time has elapsed without the interrogator transceiver receiving said response signal and, only if so, then increasing said current power level value, and repeating the steps of the interrogator transceiver transmitting, waiting, and determining; providing a portable RF transceiver which is substantially smaller and lighter than the interrogator transceiver; the portable RF transceiver waiting to receive the interrogation RF signal; and in response to receiving the interrogation signal, the portable transceiver transmitting the response RF signal. - View Dependent Claims (2, 3, 4, 5)
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6. An RF communications system, comprising:
an interrogator transceiver, including a transmitter circuit for transmitting an interrogation RF signal at a controlled power level, a receiver circuit for sensing when the interrogator transceiver receives a response RF signal in response to the interrogation signal, and means for controlling the transmitter circuit of the interrogator transceiver to initially transmit the interrogation signal at a minimum power level, and to then repeatedly transmit the interrogation signal at successively increasing power levels if the receiver circuit does not sense the response signal; and a portable RF transceiver which is substantially smaller and lighter than the interrogator transceiver, including a receiver circuit for sensing when the portable transceiver receives the interrogation RF signal, and a transmitter circuit for transmitting the response RF signal in response to the interrogation signal being sensed by the receiver circuit. - View Dependent Claims (7, 8, 9, 10)
Specification