Communication system for sending and receiving digital data

Pulse or digital communications – Receivers – Automatic gain control

Reexamination Certificate

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Reexamination Certificate

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07864900

ABSTRACT:
A system and method for constructing a transmitter and a receiver that communicate using multiple orthogonal frequencies which are locked to each other. The set of available frequencies can range from 7, 32 frequencies to a much larger set of frequencies. The transmitted frequencies are separated by a small limited bandwidth (B.W). multiple frequencies are selected from a set of available frequencies and transmitted simultaneously to the receiver. The data transmission is preceded by a calibration sequence where the shift between the transmitted frequency and the frequency measured by fast Fourier transform at the receiver system contain encoders and decoders that convert binary numbers to frequency combinations and the reverse. This transceiver system is capable of transmitting large data rate per unit of a bandwidth e.g. 6 Mbps/3.2 MHZ.

REFERENCES:
patent: 5636247 (1997-06-01), Kamerman et al.
patent: 6011499 (2000-01-01), Agarwal et al.
patent: 7385915 (2008-06-01), Stolpman et al.
patent: 2003/0223354 (2003-12-01), Olszewski
patent: 2004/0125824 (2004-07-01), Preston et al.
patent: 2005/0123060 (2005-06-01), Maltsev et al.

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