Analysis of PAPR in OTFS Modulation with Classical Selected Mapping Technique

Abstract

Orthogonal Time Frequency Space (OTFS) is the advanced stage of modulation for this fast-growing generation. This is the waveform proposed to be used in next-generation communication systems i.e., 6G, as it has the advantage of high data rate, better flexibility, requires a less cyclic prefix and less amount of peak to average power ratio (PAPR) compared to Orthogonal Frequency Division Multiplexing (OFDM). To reduce the amount of PAPR in the OTFS, the best method is the classical selected mapping (SLM) technique. This paper presents the PAPR analysis in OTFS modulation by using classical SLM and the obtained results are compared against the OFDM modulation.

An Hybrid Framework OTFS-OFDM Based on Mobile Speed Estimation

“…Then the signal is transformed into the time-frequency domain through the inverse symplectic finite Fourier transform (ISFFT) in the secondstep. This will be written like [17], [18]and [19]:…”

“…In particular, with conventional OFDM modulation, the Heisenberg transform could be achieved by an inverse fast Fourier transform (IFFT) module and transmit pulse shaping. In this scenario, the transmitted signal 𝑠(𝑡)using Heisenberg Transform as proposed by [11], [17], [18]and [19].…”

“…These changes produce shifts both in the time and frequency domains. In these conditions, the received signal could be expressed as [17], [18] and [19].…”

“…The received symbols matrix 𝑌 𝑇𝐹 [𝑚, 𝑛]in the Time Frequency Domain, is obtained by sampling the cross -ambiguity function 𝐴 𝑔 𝑟𝑥,𝑟 (𝑡, 𝑓) according to [17], [18], [19]:…”

“…In high mobility contexts, the OTFS systems achieve full diversity and greater performance compared to those obtained for OFDM [6], [7] and [27].Therefore, OTFS has received more attention. It is considered as a promising candidate for forthcoming generation of radio mobile networks [7], [18] and [19]. OTFS and OFDM waveforms both offer specific advantages and disadvantages tailored to varying mobility scenarios and system complexities.…”