Telecommunications – Transmitter and receiver at separate stations – Distortion – noise – or other interference prevention,...
Patent
1998-01-12
1999-12-21
Trost, William G.
Telecommunications
Transmitter and receiver at separate stations
Distortion, noise, or other interference prevention,...
455 671, 455 675, 455403, H04B 100
Patent
active
060060719
ABSTRACT:
An RF communication system is for operating in the presence of a repetitive RF interference source powered from an Alternating Current (AC) power line. The system uses redundant transmission synchronized to the power line to ensure accurate reception by at least one second device. The RF communication system includes a first device powered from an AC power line which also powers the repetitive RF interference source. The first device, in turn, preferably includes an RF transmitter for transmitting in a frequency band of the repetitive RF interference source, a power line sensor, and a data transmit controller. The data transmit controller generates a plurality of data packets with each data packet including an error detecting portion. The data transmit controller also operates the RF transmitter to produce repetitive first and second transmissions of a same data packet responsive to the power line sensor. Accordingly, at least one of the first and second transmissions occurs during an OFF period of the repetitive RF interference source. The second device also preferably includes a data receive controller for receiving the repetitive first and second transmissions of same data packets and selecting one based upon the error detecting portions thereof to thereby avoid interference from the repetitive RF interference source.
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Jonathan Horne, et al., "Modeling and Mitigation of Interference in the 2.4 GHz ISM Band," Pub. 2.4 GHz Interference, Mar./Apr. 1997, pp. 59-71.
Nelson George R.
Roberts Richard D.
Intersil Corporation
Trost William G.
LandOfFree
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