• ETRI Journal
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• v.46 no.4
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• pp.595-603
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• 2024

This paper presents methods for reducing the peak-to-average power ratio (PAPR) of the orthogonal time frequency space (OTFS) signal. These methods mainly consist of two operations: symbol interferometry (SI) and either 𝜇-law or A-law companding. SI spreads the data of one OTFS symbol onto all symbols and is implemented using a simple inverse fast Fourier transform operation on each OTFS symbol. During the second operation, the PAPR of the OTFS signal is significantly reduced. For our performance analysis, the complementary cumulative distribution function, probability density function, and bit error rate are illustrated through simulations performed in MATLAB. The performance is also analyzed using a solid-state power amplifier at the transmitter and compared with OTFS, 𝜇-law-based OTFS, and SI OTFS systems. The results indicate that the proposed OTFS system achieves a low PAPR.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.34 no.5A
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• pp.363-371
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• 2009

OFDM(orthogonal frequency division multiplexing) is very effective forhigh data rate transmission system. However, communication performance becomes worse because of nonlinear distortion resulting from the PAPR. In this paper, we like to propose a tone-controlled CI/OFDM system including the TMD (inter-modulation distortion) reduction method in order to improve the BER performance. In this tone-controlled CI/OFDM system, control tone is additionally inserted in each data symbol of CI/OFDM system to make the CI/OFDM lower the PAPR and robust to nonlinear distortion. So, tone-controlled CI/OFDM using the IMD reduction method shows better BER (bit error rate) performance than methods based on PAPR reduction.