Communicating in the presence of periodic noise

a communication system and periodic noise technology, applied in the field of digital wireless wideband rf communication system, can solve the problems of system requirements for expensive accurate internal time bases or access, and achieve the effect of minimizing the noise effect of periodic noise signal and effective communication

Inactive Publication Date: 2005-06-09
ASTER WIRELESS
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Benefits of technology

[0008] This need is met by a wireless communication system operating in the presence of periodic noise signals such as from a microwave oven, that includes at least two wireless communication stations with each station including a transceiver, each such transceiver. Each transceiver includes a detector for detecting periodic noise signals and producing a first signal indicating the presence of noise signal's quiescent period and second signals in

Problems solved by technology

Such a system requires expensive accurate internal time bases or access to a Global Posi

Method used

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  • Communicating in the presence of periodic noise
  • Communicating in the presence of periodic noise
  • Communicating in the presence of periodic noise

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Embodiment Construction

[0023] In addressing the above problem, it is understood that the energy emitted by a microwave oven is periodic at a frequency based on the AC power line voltage frequency. Referring to FIG. 1, a typical noise energy waveform 10 produced by a microwave oven is shown. The source of the RF noise energy is the magnetron within the microwave oven, which is driven by the AC power line. The output noise spectrum is pulsed at approximately a 50% duty cycle synchronized to the AC line voltage. The frequency of the periodic microwave signal us usually 50 or 60 Hertz or 100 or 120 Hz for bridge rectified systems. According to the present invention, this pulsed noise is detected and communication is conducted during the quiescent periods, that is during the periods 11 (between times T1 and T2 and times T3 and T4) when the microwave oven is off.

[0024] Referring to FIG. 2, a system for communicating digital data according to the present invention includes a transceiver 12 for communicating in ...

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Abstract

A wireless communication system operating in the presence of the periodic noise signals such as from a microwave oven, the communication system, including at least two wireless communication stations with each station including a transceiver, each such transceiver. Each transceiver includes a detector for detecting periodic noise signals and producing a first signal indicating the presence of noise signal's quiescent period and second signals indicating the end of quiescent periods of such periodic noise signal. A controller responsive to the first and second noise signals controls the transceiver to provide effective communication with an other transceiver which minimizes the noise effect of the periodic noise signal. The transceiver transmits information concerning the detected quiescent period for use by the other transceiver to determine when to transmit during such quiescent period.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] Reference is made to commonly-assigned U.S. Provisional Patent Application Ser. No. 60 / 118,798 filed Feb. 5, 1999, by Carlson et al. entitled “Communicating in the Presence of Periodic Microwave Noise.”FIELD OF THE INVENTION [0002] This invention relates to a digital wireless wideband RF communication system operating in periodic noise environments. Such a system is useful, for example, for communicating digital data at high data rates; e.g. rates greater than 1 Mega bits per second (Mbps). BACKGROUND OF THE INVENTION [0003] With the advent of digital photography, the wireless transmission of digital images, for example between a portable transmitting device like a digital camera and a receiving device such as a personal computer or other image appliance such as a printer, has become a desirable feature. High data rate transmissions are desirable because digital images represent a large amount of data and short transmission times are ne...

Claims

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Application Information

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IPC IPC(8): H04B1/10
CPCH04B1/1027
Inventor CARLSON, GRANT B.ALLEN, JAMES D.HEBERLING, ALLEN D.
Owner ASTER WIRELESS
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