Method and apparatus for generating a short-range wireless data communication link
AssigneeMotorola, Inc.
InventorsJames A. McDonald, Takehiko Tsutsumi, William J. Wilson, Anders A. Eklof
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Abstract
A system for generating a short-range wireless data communication link through an over-the-air channel on a predetermined radio frequency (RF) carrier. The system integrates conventional RF techniques into a low-power and low-cost system for establishing short-range wireless data communication. The system generates short-range wireless data communication links between a transmitting unit (500) that transmits an operating signal carrying data, and a receiver unit (1000) that receives the operating signal without a synthesizer or a heterodyne scheme.
Claims31
A system for generating a short-range wireless data communication link through an over-the-air channel on a predetermined radio frequency carrier comprising:
- a transmitting unit that transmits an operating signal, the transmitting unit comprising:
- a clock source that provides a data clock;
- a data source that provides data;
- a subcarrier modulator coupled to the data source;
- a subcarrier source coupled to the subcarrier modulator;
- a radio frequency carrier source that operates on the predetermined radio frequency carrier;
- a dither unit coupled to the radio frequency carrier source;
- an amplitude modulator coupled to the radio frequency carrier source and the subcarrier modulator;
- and
- an antenna segment coupled to the amplitude modulator;
- a receiving unit that receives the operating signal from the transmitting unit, the receiving unit comprising:
- an antenna segment that receives the operating signal through an over-the-air channel on the predetermined radio frequency carrier;
- a radio frequency bandpass filter coupled to the antenna segment;
- an envelope detector coupled to the radio frequency bandpass filter;
- an intermediate frequency amplifier coupled to the envelope detector;
- and
- a subcarrier demodulator coupled to the intermediate frequency amplifier;
- wherein the transmitting unit is adapted to operate at the predetermined radio frequency carrier to transmit the operating signal carrying the data, and wherein the receiving unit is adapted to operate at the predetermined radio frequency carrier to receive the operating signal carrying the data.
In a wireless communication system, a transmitting unit adapted to transmit an operating signal carrying data to generate a short-range wireless data communication link through an over-the-air channel on a predetermined radio frequency carrier, the transmitting unit comprising:
- a clock source that provides a data clock;
- a data source that provides the data;
- a subcarrier modulator coupled to the data source;
- a subcarrier source coupled to the subcarrier modulator;
- a radio frequency carrier source that operates on the predetermined radio frequency carrier;
- a dither unit coupled to the radio frequency carrier source;
- an amplitude modulator coupled to the radio frequency carrier source and the subcarrier modulator;
- and
- an antenna segment coupled to the amplitude modulator.
A method for generating a short-range wireless communication link through an over-the-air channel on a predetermined radio frequency carrier comprising the steps of:
- providing a data clock;
- providing data;
- generating a subcarrier;
- modulating the subcarrier with the data to generate a modulated subcarrier;
- generating the predetermined radio frequency carrier;
- dithering the predetermined radio frequency carrier;
- amplitude modulating the predetermined radio frequency carrier with the modulated subcarrier to generate an operating signal;
- transmitting the operating signal through an over-the-air channel at the predetermined radio frequency carrier;
- receiving the operating signal;
- filtering the operating signal;
- envelope detecting the filtered operating signal to recover a received modulated subcarrier;
- intermediate frequency amplifying the received modulated subcarrier;
- and
- demodulating modulated subcarrier to recover the data.
A system for generating a short-range wireless communication link through an over-the-air channel on a predetermined radio frequency carrier comprising:
- a means for providing a data clock;
- a means for providing data;
- a means for generating a subcarrier;
- a means for modulating the subcarrier with the data to generate a modulated subcarrier;
- a means for generating the predetermined radio frequency carrier;
- means for dithering the predetermined radio frequency carrier;
- a means for amplitude modulating the predetermined radio frequency with the modulated subcarrier to generate an operating signal;
- a means for transmitting the operating signal;
- a means for receiving the operating signal;
- a means for filtering the operating signal;
- a means for envelope detecting the filtered operating signal to recover a received modulated subcarrier;
- a means for intermediate frequency amplifying the received modulated subcarrier;
- and
- a means for demodulating the modulated subcarrier to recover the data.
Dependencies are inferred from the claim text.