US 12,237,864 B2
Multi-user wireless digital communication over sound wave in air by coupling direct sequence spread spectrum—orthogonal frequency division multiplexing (DSSS-OFDM) for low SNR regime
Bashkar Deo, Cambridge, MA (US)
Assigned to TRILLBIT, INC., Boston, MA (US)
Appl. No. 18/707,266
Filed by TRILLBIT, INC., Boston, MA (US)
PCT Filed Nov. 23, 2022, PCT No. PCT/US2022/050933
§ 371(c)(1), (2) Date May 3, 2024,
PCT Pub. No. WO2023/097023, PCT Pub. Date Jun. 1, 2023.
Claims priority of provisional application 63/283,405, filed on Nov. 26, 2021.
Prior Publication US 2024/0429965 A1, Dec. 26, 2024
Int. Cl. H04B 1/71 (2011.01); H04B 1/711 (2011.01); H04L 1/00 (2006.01); H04L 9/32 (2006.01)
CPC H04B 1/711 (2013.01) [H04L 1/0071 (2013.01); H04L 9/32 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method performed by a transceiver in a near ultrasonic acoustic (audio) frequency range of a wireless communication network, the method comprises:
receiving a modulated data signal generated from coupled direct sequence spread spectrum (DSSS) and orthogonal frequency division multiplexing (OFDM) at a transmitter, wherein the modulated data signal further comprises a phase-shift key (PSK) modulated data signal spread by different Q length chip sequence; and
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.