Method and system for impulse radio wakeup
Communication networks are implemented using a variety of devices and methods. In a particular embodiment for use in a communication network having RF-communication devices that communicate using a RF protocol, an RF-communication device is implemented with an RF transceiver ( 110 ) to communicate over the network using the RF protocol and being controllable in a reduced power-consumption mode in which the RF transceiver does not communicate over the network. The device also includes an RF receiver ( 104, 106 ) including an envelope detector ( 104 ) and a pulse generator circuit ( 106 ). The envelope detector circuit ( 104 ) providing an envelope-based signal to a pulse generator circuit ( 106 ) that, in response to the envelope-based signal and after generating a number of pulses that exceeds a predetermined number of pulses, prompts the RF transceiver ( 110 ) to transition out of the reduced power-consumption mode.
1. A RF-communication device comprising:
a RF transceiver to communicate over a communication network using a RF protocol and being controllable in a reduced power-consumption mode in which the RF transceiver does not communicate over the network; and
a RF receiver including an envelope detector and a pulse generator circuit, the envelope detector circuit providing an envelope-based signal to a pulse generator circuit that, in response to the envelope-based signal and after generating a number of pulses that exceeds a predetermined number of pulses, prompts the RF transceiver to transition out of the reduced power-consumption mode,
wherein the pulse generator circuit comprises a comparator to compare the envelop-based signal to a threshold voltage, wherein the threshold voltage is a function of a maximum distance between communicating devices in the communications network;
wherein the RF receiver includes a timing circuit to record pulse timings of the generated pulses and to compare the recorded pulse timings to predetermined pulse timing for the RF-communication device.
2. The device of claim 1 , wherein the RF transceiver and the RF receiver use the same antenna.
3. The device of claim 1 , wherein the pulse generator circuit determines if a pulse is valid pulse by monitoring the duration of the pulse.
4. The device of claim 1 , wherein the envelope detector is a diode envelope detector.
5. The device of claim 1 , wherein the pulse generator circuit includes a pulse counter that counts the generated pulses.
6. The device of claim 1 , wherein the predetermined pulse timing identifies the RF device and is one of a periodic repetition of a pulse, a pseudorandom time-hopping sequence and a deterministic time-hopping sequence.
7. The device of claim 1 , wherein the RF protocol used by the RF transceiver is an impulse radio protocol.
8. The device of claim 1 , wherein the device is self-powered and includes a sensor that does not include monitoring of the communication network.
9. The device of claim 1 , wherein both the transceiver and receiver are located on the same integrated-circuit die.
10. The device of claim 9 , wherein the transceiver and receiver do not use an oscillator that is external to the integrated-circuit die.
11. A RF-communication device having a RF transceiver to communicate over a communication network using a RF protocol and being controllable in a reduced power-consumption mode in which the RF transceiver does not communicate over the network and an RF receiver, the reduced power consumption mode for one of the RF communication devices comprising:
generating an envelope-based signal from an RF signal received by the RF receiver;
detecting a valid RF impulse signal, in response to the envelope-based signal, wherein detecting a valid RF impulse signal includes comparing of the envelope-based signal to a threshold voltage that is determined as a function of a maximum allowable distance between communicating devices; and
in response to detecting a valid RF impulse signal, prompting the RF transceiver to transition out of the reduced power-consumption mode;
wherein the step of detecting a valid RF impulse signal includes comparing timings of received pulses to predetermined pulse timings for the RF-communication device.
12. The method of claim 11 , wherein the step of detecting a valid RF impulse signal includes a comparison of the envelope-based signal to a minimum pulse duration.
13. The method of claim 11 , wherein the step of detecting a valid RF impulse signal includes a comparison of the envelope-based signal to a minimum pulse duration.
14. The method of claim 11 , wherein the predetermined pulse timings are one of a periodic repetition of a pulse, a pseudorandom time-hopping sequence and a deterministic time-hopping sequence.