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Recently, a new precoding technique called orthogonal time-frequencysignaling (OTFS) has been proposed for time- and frequency-selectivecommunication channels. OTFS precodes a data frame with a complete set ofspreading sequences and transmits the results via orthogonal frequency divisionmultiplexing (OFDM). OTFS uses two dimensional (2D) linear spreading sequencesin time and frequency which are the basis functions of a symplectic Fouriertransform. OTFS allows the utilization of time- and frequency-diversity butrequires maximum likelihood decoding to achieve full diversity. In this paperwe show performance results of a low-complexity equalizer using soft-symbolfeedback for interference cancellation after an initial minimum-mean squareerror equalization step. Performance results for an implementation in thedelay-Doppler domain and in the time-frequency domain are compared. With ourequalizer, OTFS achieves a gain of 5dB compared to OFDM for a bit error rate of$10^{-4}$ and a velocity of $200\,\text{km/h}$.

Low-Complexity Equalization for Orthogonal Time and Frequency Signaling (OTFS)