Title:
MULTI-USER WIRELESS DIGITAL COMMUNICATION OVER SOUND WAVE IN AIR BY COUPLING DIRECT SEQUENCE SPREAD SPECTRUM-OFDM
Document Type and Number:
WIPO Patent Application WO/2023/097023
Kind Code:
A3
Abstract:
Wireless digital communication of information over sound waves is provided using near near-ultrasonic acoustic (audio)-spectrum. A method includes receiving a modulated data signal generated from coupled direct sequence spread spectrum (DSSS) and orthogonal frequency division multiplexing (OFDM) at a transmitter. The modulated data signal has a phase-shift key (PSK) modulated data signal spread by different Q length chip sequence. The method includes demodulating a synchronized data signal by extracting each OFDM data block having a data symbol and preamble and postamble symbols which were transmitted on an orthogonal sub-carrier with variable Q length chip sequence for multi-user communication over air as a transmission medium. This enables synchronization of communication over the air between transmitters and receivers in multiple user devices in the presence of multiple path propagation and different signal to noise ratios. Simultaneous communication over air between transmitters and receivers in multiple user devices can be done.
Inventors:
DEO BASHKAR (US)
Application Number:
PCT/US2022/050933
Publication Date:
August 03, 2023
Filing Date:
November 23, 2022
Export Citation:
Assignee:
TRILLBIT INC (US)
International Classes:
H04B11/00; H04J11/00; H04L5/06; H04L27/10; H04L27/14; H04L27/18; H04B17/00
Foreign References:
| IN202144006910A | ||||
| US20140036964A1 | 2014-02-06 | |||
| US7333528B1 | 2008-02-19 | |||
| US10491261B1 | 2019-11-26 |
Other References:
DESSALERMOS SPYRIDON: "Adaptive Reception for Underwater Communications", DOCTORAL DISSERTATION, NAVAL POSTGRADUATE SCHOOL, 1 June 2011 (2011-06-01), XP093083296, Retrieved from the Internet [retrieved on 20230919]
Attorney, Agent or Firm:
MESSINGER, Michael (US)
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