US 11,671,300 B2
Discrete Fourier transform spread orthogonal time frequency space modulation method
Chong Han, Shanghai (CN); and Yongzhi Wu, Shanghai (CN)
Assigned to SHANGHAI JIAOTONG UNIVERSITY, Shanghai (CN)
Filed by SHANGHAI JIAOTONG UNIVERSITY, Shanghai (CN)
Filed on Jun. 16, 2022, as Appl. No. 17/807,320.
Claims priority of application No. 202110812760.2 (CN), filed on Jul. 19, 2021.
Prior Publication US 2023/0016587 A1, Jan. 19, 2023
Int. Cl. H04L 27/26 (2006.01); H04L 27/01 (2006.01); H04L 1/00 (2006.01)
CPC H04L 27/2628 (2013.01) [H04L 1/0042 (2013.01); H04L 27/01 (2013.01); H04L 27/2614 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method for preparing a discrete Fourier transform spread orthogonal time-frequency space modulation for millimeter wave and Terahertz wireless communication, the method comprising:
a transmission process, by a transmitter comprising
DFT precoding;
delay-Doppler domain mapping;
OTFS modulating, to modulate a data frame from the mapping into a time domain transmission signal; and
transmitting the transmission signal, by the transmitter, through a wireless channel; and
a receiving process, by a receiver, comprising
receiving the transmission signal,
performing equalization, on the received transmission signal to obtain a delay-Doppler domain transmission data frame; and
performing delay-Doppler domain de-mapping and IDFT decoding on the delay Doppler domain transmission data frame to obtain transmit data symbols;
wherein DFT precoding process specifically refers to DFT operation along the Doppler axis in the time delay Doppler domain:

OG Complex Work Unit Math
where L is a DFT precoding size, x is an N×M transmission data frame, M is the number of subcarriers, N is the number of symbols, x is the delay-Doppler domain signal, k=0,1, . . . , K−1,n=0,1, . . . , L−1,l=0,1, . . . , M−1,K is the number of users.