Method and apparatus for high data rate long range acoustic and rf communication using chirp waveform modulation
AssigneeThe Research Foundation for The State University of New York
InventorsDimitrios PADOS, Stella BATALAMA, Georgios SKILVANITIS, Song-Wen HUANG
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Abstract
The present disclosure may be embodied as a transmitter for multiuser multicarrier-chirp-division-multiplexing (“MU-MCDM”) communications. The present disclosure may be embodied as a receive for MU-MCDM communications. The present disclosure may also be embodied as a method for transmitting an MU-MCDM communication signal. The present disclosure may also be embodied as a method for receiving an MU-MCDM communication signal.
Claims32
A transmitter for multiuser multicarrier-chirp-division-multiplexing (“MU-MCDM”) communication, comprising:
- a symbol mapper configured to map a multiuser data set to a plurality of baseband symbols;
- an inverse orthogonal chirp transform configured to modulate the plurality of baseband symbols to a plurality of chirp modulated waveforms according to a predetermined subcarrier allocation scheme and generate a plurality of parallel multicarrier chirp division multiplexing (“MCDM”) symbols mapped to frequency subcarriers;
- a parallel-to-serial converter configured to convert the plurality of parallel MCDM symbols into a serial digital signal, wherein the serial digital signal comprises the plurality of MCDM symbols as consecutive MCDM symbols;
- a preamble module configured to insert one or more preamble blocks into the serial digital signal;
- and
- a zero padding module configured to insert one or more zero values between consecutive MCDM symbols in the serial digital signal.
A receiver for multiuser multicarrier-chirp-division-multiplexing (“MU-MCDM”) communication, comprising:
- a serial-to-parallel converter configured to convert a serial digital signal into a plurality of MCDM symbols mapped to a plurality of frequency subcarriers;
- an orthogonal chirp transform configured to demodulate the plurality of MCDM symbols according to a plurality of chirp modulated waveforms and generate a plurality of baseband symbols;
- a channel estimator configured to estimate channel coefficients of each frequency subcarrier of the plurality of frequency subcarriers;
- a symbol detector configured to detect a multiuser data set based on the channel coefficients and the baseband symbols.
The method of claim 17, further comprising digitally upsampling the serial digital signal.
A method for multiuser multicarrier-chirp-division-multiplexing (“MU-MCDM”) communications, comprising:
- mapping a multiuser data set to a plurality of baseband symbols;
- using an inverse orthogonal chirp transform to modulate the plurality of baseband symbols with a plurality of chirp modulated waveforms according to a predetermined subcarrier allocation scheme and generate a plurality of parallel MCDM symbols mapped to frequency subcarriers;
- converting the plurality of parallel MCDM symbols into a serial digital signal, wherein the serial digital signal comprises the plurality of MCDM symbols as consecutive MCDM symbols;
- inserting one or more preamble blocks into the serial digital signal;
- inserting zero-padding blocks between consecutive MCDM symbols of the serial digital signal;
- converting the serial digital signal into an analog baseband frequency signal;
- upconverting the analog baseband frequency signal into an analog carrier frequency signal;
- and
- transmitting the analog carrier frequency signal in acoustic or radio frequencies.
The method of claim 17, further comprising amplifying the analog carrier frequency signal.
A method for receiving a multiuser multicarrier-chirp-division-multiplexing (“MU-MCDM”) communication signal, comprising:
- receiving an analog carrier frequency signal;
- downconverting the analog carrier frequency signal into an analog baseband frequency signal;
- converting the analog baseband frequency signal into a serial digital signal;
- converting the serial digital signal into a plurality of multicarrier chirp division multiplexing (“MCDM”) symbols mapped to a plurality of frequency subcarriers;
- using an orthogonal chirp transform to demodulate the plurality of MCDM symbols according to a plurality of chirp modulated waveforms to generate a plurality of baseband symbols;
- estimating channel coefficients of each frequency subcarrier of the frequency subcarriers;
- and
- detecting a multiuser data set based on the channel coefficients and the baseband symbols.
Dependencies are inferred from the claim text.