US 12,231,278 B2
System and method for spectrally efficient pilot and detector design in delay-doppler domain for OTFS-based NR (new radio) IoT and massive machine tomachine (M2M) communications
Chattla Santosh Reddy, West Bengal (IN); Preety Priya, West Bengal (IN); Debarati Sen, West Bengal (IN); and Chetna Singhal, West Bengal (IN)
Assigned to THE INDIAN INSTITUTE OF TECHNOLOGY KHARAGPUR, West Bengal (IN)
Filed by THE INDIAN INSTITUTE OF TECHNOLOGY KHARAGPUR, West Bengal (IN)
Filed on Jan. 10, 2023, as Appl. No. 18/152,607.
Claims priority of application No. 202231027219 (IN), filed on May 11, 2022.
Prior Publication US 2023/0370316 A1, Nov. 16, 2023
Int. Cl. H04L 27/26 (2006.01); H04L 25/02 (2006.01)
CPC H04L 27/2639 (2013.01) [H04L 25/0224 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A spectrally efficient low complex Orthogonal Time Frequency Space (OTFS) modulation based transceiver system for resource-constrained IoT device and M2M type communication in high-mobility environment comprising:
at least one transmitter configured to transmit bit stream using adaptive Orthogonal Time Frequency Space (OTFS) frame with selectively embedded pilot depending on mobility condition for improving spectral efficiency; and
at least one receiver configured to dispose onto IoT devices for receiving the transmitted bit stream, said receiver updates the transmitter about mobility condition of said at least one receiver through a control channel;
wherein said adaptive OTFS frame includes information symbols arranged in Doppler-first-delay-second arrangement in a 2-dimensional grid size of M delay samples and N Doppler samples, where rows denote the delay index and columns denote the Doppler index and the delay rows (0≤m<M−dmax−1) have data symbols in the grid, where lower rows (M−dmax) in the grid set are set to zeros for a given maximum delay dmax of the channel and the grid forms an arrangement of the information symbols in the Delay-Doppler which is zero-padded OTFS and facilitates to detect the symbols at the receiver by a joint channel estimator and a low-complex iterative detector.