Joint Compensation of TX/RX IQ Imbalance and Channel parameters for OTFS Systems under Timing Offset

Orthogonal time frequency space (OTFS) is resistant to doubly-selective fading channels. Hardware imperfections in direct conversion OTFS systems include in-phase and quadrature (IQ) imbalance at the transmitter (TX) and at the receiver (RX). Hardware imperfections are unavoidable and should be perfectly compensated to improve bit error rate (BER) performance. We propose combined estimate of IQ imbalance (TX/RX) and channel parameters under timing offset in the delay time domain using training sequence based technique. Having derived input-output relations, it is shown that the compensated system performs almost as well as the ideal system under fractional delay and fractional Doppler using low complexity matched filtered Gauss-Seidel iterative technique of detection.