Pulse or digital communications – Systems using alternating or pulsating current
Reexamination Certificate
2008-04-29
2008-04-29
Corrielus, Jean B. (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
C375S130000
Reexamination Certificate
active
07366243
ABSTRACT:
A technique for transmitting a spread spectrum signal using plural non-contiguous frequency bands separated by segments of frequency spectrum excluded from use involves: generating a digital time-domain spread spectrum signal; converting the time-domain signal to a frequency-domain signal via an FFT; excising a portion of the frequency-domain signal by selectively removing frequency bins of the frequency-domain signal to cause spectral nulling of the transmit signal at the frequencies of the excluded segments; and converting the excised frequency-domain signal to an excised time-domain signal via an inverse FFT, which is then converted to an analog signal for transmission. The non-contiguous spectrum selection technique is implemented in a transmitter that transmits data communication signals or navigation signals, and permits use of plural, non-contiguous frequency bands to transmit a wide bandwidth signals that cannot be transmitted in a continuous frequency band due to constrains in the allocated frequency spectrum available for transmission.
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Corrielus Jean B.
Edell Shapiro & Finnan LLC
ITT Manufacturing Enterprises Inc.
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