Peak to Average Power Ratio Reduction on Orthogonal Time Frequency Space for High-Speed Applications

Abstract

Orthogonal time frequency selective (OTFS) is regarded as one of the emerging advanced radio waveforms for beyond fifth generation (5G) radio system. OFTS modulates the signal in using Doppler characteristics making it suitable for the high-speed communications. However, high peak to average power ratio (PAPR) is considered as one of the problems in OTFS which degrade the efficiency of the power amplifier (PA) used in OTFS structure. The PAPR is reduced by implementing a bacteria foraging algorithm based Partial transmission sequence (BFA-PTS) method which lowers the high peak of an OTFS signal. The BFA-based PTS reduces the PAPR of OTFS waveforms by optimizing phase sequences through a foraging-inspired search process, effectively minimizing peak values and improving signal efficiency. It is also noted that PAPR performance is used to improve while preserving the throughput and power spectral density of an OTFS method with minimal complexity.

Specification

Description:The exemplary embodiment of figure 1 and figure 2 illustrated ,the OTFS is a 2D modulation scheme that maps data symbols onto the delay-Doppler domain. It enhances communication in dynamic environments by offering resilience to Doppler shifts and multipath fading, ideal for high-mobility scenarios in which Figure 1. depicts structure of the OTFS waveform (101). Figure 2. Indicate the PTS structure for reducing PAPR in OTFS systems (102). It divides the input data into subblocks, applies phase factors, and combines them to minimize the PAPR of the transmitted signal (104). An IFFT is performed to estimate the time-domain OTFS signal (105). Bacteria Foraging Algorithm (BFA) which is inspired by the foraging behavior of bacteria. For Partial Transmit Sequence (PTS) method, BFA is used to determine optimal phase factors. By simulating bacterial movement and chemotaxis, BFA efficiently explores phase combinations to minimize PAPR, enhancing signal quality (103). Finally, the signals with low PAPR values are added and transmitted (106). , Claims:1.a OTFS structure (101) comprises a PTS method (102) and a BFA optimal phase factors (103);
2. a OTFS structure (101) as claimed in claim 1 is robust to Doppler shifts, making it suitable for high-speed scenarios and environments with rapid speed;
3. a OTFS structure (101) as claimed in claim 1 wherein Partial Transmit Sequence (PTS) (102) reduces the PAPR of OTFS by optimizing phase factors to minimize peak power in the transmitted signal;
4. a OTFS structure (101) as claimed in claim 1 wherein Bacteria Foraging algorithm (BFA) (103) optimizes the phase factors in PTS to effectively minimize the time search for generating the phase elements for OTFS symbols resulting in minimization of high peak power of OTFS signals.;and
5. a OTFS structure (101) as claimed in claim 1 and claim 2 wherein the combination of BFA and PTS gives an optimal PAPR performance while preserving the throughput and spectral access performance at trivial complexity.

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