Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2011-03-08
2011-03-08
Tran, Khanh C (Department: 2611)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
Reexamination Certificate
active
07903765
ABSTRACT:
This invention relates to signal transmitting engineering. The use of the inventive method demodulation of a signal of multiple position frequency manipulation with equidistant frequency spreading allows to reduce the threshold of demodulation and to ensure a quality of demodulation, which is at least identical to that of a quasi-optimal demodulator. To obtain such a result, a frequency grid is formed with a possibility of precise tuning of frequency spreading; during the reception, values having a maximum module of reception signal are extracted at all frequencies switchable values at clock frequency, this clock frequency is extracted from maximum of the received signals and is used for a precise tuning of the frequency spreading; a grid of tunable frequency is tuned with a precisely tuned frequency spreading for exact values of a frequency of received signal, and demodulation is effected by the way of coherent reception of the received signal, using only one from quadrature signals to decide whether a signal of a determined frequency is absent or present among the mentioned exact values of frequency.
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Dounaev Igor Borisovich
Grigoriev Alexander Vladimirovich
Letunov Leonid Alexeevich
Houston Eliseeva LLP.
Igor Borisovich Dounaev
Tran Khanh C
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