An embedded pilot power based channel estimation and low-complexity feedback equalization scheme for OTFS system

Alternative threshold-based channel estimation and message-passing-based symbol detection in MIMO-OTFS systems using superimposed pilots

“…This second group includes the incorporation of both pilots and data symbols in a single OTFS frame by incorporating guard intervals around the pilots to prevent data interference during the CE process [3,15,16,[22][23][24][25][26][27][28][29][30]33]. Authors in [3] propose an embedded pilot-aided CE for OTFS in the DD channels.…”

OTFS System-based on WFrFFT with Optimal Design Complexity

“…Hence, one can exactly estimate the DD effects in the received signal at the receiver. Exploiting this, simple yet power channel estimation schemes have been proposed to find channel coefficient gain, delay, and Doppler shifts using a pilot symbol having high-power inserted in the data frame [7], [8]. Further, to reduce the spectral loss channel estimation techniques are proposed that use superimposed pilots on the data symbols [9], [10].…”

“…Data detection at the receiver is one of the main challenges in the OTFS system. Various types of detectors are proposed for OTFS systems, Low complexity linear MMSE and Zero Forcing detectors are addressed in [11], whose complexity is considerably reduced compared to the conventional MMSE detectors with channel matrix inversion, and a feedback equalizer is proposed in [8], having linear complexity. Approximate MAP detection methods with linear complexity have been discussed in [12]- [15].…”

OTFS System based on WFrFT-OFDM with Optimal Design Complexity

“…Hence, one can exactly estimate the DD effects in the received signal at the receiver. Exploiting this, simple yet power channel estimation schemes have been proposed to find channel coefficient gain, delay, and Doppler shifts using a pilot symbol having high-power inserted in the data frame [8], [9]. Further, to reduce the spectral loss channel estimation techniques are proposed that use superimposed pilots on the data symbols [10], [11].…”

“…Data detection at the receiver is one of the main challenges in the OTFS system. Various types of detectors are proposed for OTFS systems, Low complexity linear MMSE and Zero Forcing detectors are addressed in [12], whose complexity is considerably reduced compared to the conventional MMSE detectors with channel matrix inversion, and a feedback equalizer is proposed in [9], having linear complexity. Approximate MAP detection methods with linear complexity have been discussed in [13]- [16].…”