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

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.