Abstract
Orthogonal Time Frequency Space (OTFS) is an emerging technique designed to accommodate for high mobility scenarios. The general idea of OTFS is to transmit information QAM symbols as a two-dimensional signal where the first dimension is called delay and the second dimension is called Doppler. Inverse Symplectic Fourier Transform (ISFFT) is then applied to spread Delay-Doppler signal in time-frequency domain which exploits full diversity over time and frequency. OTFS stands out under high Doppler circumstances once the extraction of full channel diversity is obtained at the receiver. In this work, firstly, an equivalent channel matrix representing the whole OTFS mod/demod process even with synchronization errors considered is proposed. Based on which, a low complexity Linear Minimum Mean Square Error (LMMSE) receiver exploiting the unique structure of such matrix is then investigated. As a result, a log-linear order of complexity is acquired without any performance degradation of BER.
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