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US 10,257,009 B2Granted
Method for multichannel signal search and demodulation and technique to demodulate and detect DBPSK FDMA ultra-narrow band signal
AssigneeWaviot Integrated Systems, LLC
InventorsAndrey Orlov, Vasiliy Anisimov
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Abstract
Described is a method of searching of multichannel signal and technique of demodulating and detecting DBPSK frequency division multiple access (FDMA) ultra-narrow band signal. A search is based on algorithm encompassing a signal-processing signal, and technique to demodulate and detect FDMA ultra-narrow band together with a method to increase time-frequency resolution.
Claims6
A method for demodulating independent channels, the method comprising:
- setting a length of a Fourier transform (FFT) to be equal to or lower than the length of a transmitted symbol;
- performing additional of series of transforms with different starting time offsets and frequency shifts;
- adding two series of transforms with different frequency shifts, wherein one of the series is shifted by one and the other is shifted by two thirds frequency resolution value of the FFT;
- and
- adding three series of transform with different initial time offsets, wherein an initial offset of one, two or three-quarter of transform size is applied to a respective one of the series of transforms, each unique shift-offset pair forming three independent channels,
- simultaneously decoding and demodulating the three independent channels in frequency domain based on in-phase and quadrature components and on phase information.
3 more elements
Dependencies are inferred from the claim text.