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Orthogonal time frequency space (OTFS) is a modulation technique that isdedicated to the high-speed mobility scenario. However, its transmissioninvolves a two-dimensional convolution of the symbols of interest and themultipath fading channel, and it complicates the equalization. In addition tothe high-complexity issue, the existing pilot pattern to estimate the unknownchannel accurately requires large overhead to avoid the pilot beingcontaminated, which is spectrally inefficient. In this paper, we propose areceiver approach by the marriage of the OTFS and a large-scale antenna array,which allows low-complexity detection and low-overhead pilot pattern design.First, the received signal from each path of the multipath fading channel isidentified by a high-resolution receive beamformer facilitated by a large-scaleantenna array. Then the identified signal from each angle in the delay-Dopplerdomain reduces to a flat-faded signal, which can be simply equalized using thechannel information estimated by our pilot pattern. We further provide theestimator of the channel fading and the rotations of delay and Doppler. Withthese estimates, the symbols of interest can be recovered, and then, thesignals from all angles of arrival are combined as different diversityversions. In addition, our pilot pattern with only around 25% overhead of theexisting pilot pattern ensures the same protection of pilot pollution.Eventually, the efficiency, the reliability, and the low complexity of theproposed receiver approach are further validated by the numerical results.

Low-complexity and Low-overhead Receiver for OTFS via Large-scale Antenna Array