Abstract:

Orthogonal Frequency Division Multiplexing as an alternative waveform for future Integrated Sensing and Communication signals is widely studied.However,the issue of high peak-to-average power ratio in orthogonal frequency division multiplexing signals not only leads to a decrease in communication performance after passing through high-power amplifiers,but also results in suboptimal sensing performance.In this paper,a companding transform is proposed to alter the probability density distribution of signal amplitudes,aiming to reduce the PAPR of integrated OFDM signals while maintaining excellent communication and sensing performance.Simulation analysis shows that,under roughly the same peak-to-average power ratio conditions,in 64-QAM modulation,the communication bit error rate of the integrated communication and perception system containing the proposed peak-to-average power ratio reduction algorithm in this paper is respectively 0.1 dB,0.29 dB,0.69 dB,and 1.1dB lower than other algorithms after passing through a solid-state power amplifier and an additive white Gaussian noise channel when the BER is 10^-5.In terms of sensing performance,the root mean square error(RMSE) of both velocity estimation and range estimation for the integrated communication and sensing system incorporating the proposed companding algorithm in this paper is superior to that of the OFDM integrated communication and sensing system without the companding algorithm.

Key words: orthogonal frequency-division multiplexing, integrated sensing and communication, peak-to-average power ratio, companding transformation