An Efficient Channel Estimation Scheme for Short Frame OTFS Using Impulse-Train Pilots

For the short frame orthogonal time frequency space (OTFS) systems, a precise delay-Doppler (DD) channel parameter estimation is tough to be achieved due to the Heisenberg uncertainty principle. This paper presents an efficient non- parametric channel estimation scheme for short frame OTFS systems, where an impulse-train pilot pattern is adopted to avoid the interferences between data and pilot. The proposed scheme estimates the delay-time (DT) channels, rather than DD channels, using interpolation approaches. Therefore, the parameters of path number, gain, delay and Doppler shift are no longer needed. Numerical results validate that the proposed scheme achieves a promising performance combined with the DT domain based MRC-Rake detector.