Method and system of reducing collisions in an asynchronous...

Details Method and system of reducing collisions in an asynchronous... Method and system of reducing collisions in an asynchronous...

2004-03-18

2008-12-02

Wang, Ted (Department: 2611)

Pulse or digital communications

Receivers

Interference or noise reduction

C375S344000, C370S335000, C370S337000, C370S342000

Reexamination Certificate

active

07460624

ABSTRACT:
A method (60or70) and system of reducing collisions in an asynchronous communication system can include the steps at a transmitter (200) of generating (61) a set of known preamble waveforms and transmitting (64) at least one distinguishable preamble waveform based on an association with a call type and a receiver identifier. The method (70) can also include the steps at a receiver (300) of receiving (71) at least one preamble waveform among a set of different preamble waveforms which toggle between two symbol frequencies, the different preamble waveforms being distinguishable by at least having one among a different symbol frequency spacing and a different symbol toggling duty cycle. The method further includes the step of selecting (73) to decode a preamble waveform based on at least one among the different symbol frequency spacing and the different symbol toggling duty cycle.

REFERENCES:
patent: 3730998 (1973-05-01), Schmidt et al.
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patent: 6269088 (2001-07-01), Masui et al.
patent: 6359871 (2002-03-01), Chung et al.
patent: 7106814 (2006-09-01), Carsello
patent: 2003/0223476 (2003-12-01), Kanterakis et al.
patent: 2004/0190652 (2004-09-01), Gamble et al.

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