Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2006-08-16
2010-10-12
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S261000, C375S268000, C375S297000, C375S298000, C375S300000, C375S324000, C375S348000, C375S349000
Reexamination Certificate
active
07813433
ABSTRACT:
A device and system communicates data and includes a modulation and mapping circuit that modulates and maps data symbols into a plurality of multiple subcarrier frequencies that are orthogonal to each other to form an Orthogonal Frequency Division Multiplexed (OFDM) communications signal based on a fixed or variable OFDM symbol rate. A pseudo-random signal generator is operative with the modulation and mapping circuit and generates pseudo-random signals to the modulation and mapping circuit based on an encryption algorithm for frequency hopping each subcarrier at an OFDM symbol rate to lower any probability of interception and detection, reduce power per frequency (dB/Hz/sec), and lower any required transmission power while maintaining an instantaneous signal-to-noise ratio, wherein selected subcarriers are turned ON or OFF to increase the transmit power and signal-to-noise ratio and reduce the Inter-Carrier Interference (ICI) and adverse effects of frequency selective fading.
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Allen Dyer Doppelt Milbrath & Gilchrist, P.A.
Harris Corporation
Liu Shuwang
Timory Kabir A
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