基于OFDM的太赫兹通感一体化波形设计与性能分析

Design and performance analysis of terahertz integrated sensing and communication waveform based on OFDM

摘要:

针对当前正交频分复用(OFDM)通信系统，开展了基于二维快速傅里叶变换(2D-FFT)的一体化波形研究。探究了太赫兹OFDM波形感知特性，通过理论和仿真计算相结合，分析不同频率和带宽下波形参数设计的影响，以指导太赫兹OFDM通信感知一体化(ISAC)系统设计。理论和仿真计算分析表明，太赫兹OFDM通信感知一体化系统具有多目标感知能力，太赫兹大带宽特性使其感知距离分辨力高达厘米级，速度分辨力可达分米每秒级，且低感知信噪比情况下仍能解析出目标的位置与速度信息，证明了OFDM通信感知一体化波形能够支撑太赫兹窄波束移动通信。

Abstract:

Focusing on current Orthogonal Frequency Division Multiplexing(OFDM) communication systems, the integrated waveforms study is conducted based on two-Dimensional Fast Fourier Transform(2D-FFT). The sensing characteristics of THz OFDM waveforms are investigated by combining theoretical analysis with simulations to analyze the impacts of waveform parameter design under various frequencies and bandwidths, aiming to guide the design of THz OFDM Integrated Sensing And Communication(ISAC) systems. Theoretical and simulation analysis demonstrates that the THz OFDM integrated communication and sensing system possesses multi-object sensing capabilities, with the large bandwidth of THz enabling a high range resolution of the OFDM waveform sensing up to the centimeter level and a velocity resolution up to decimeter per second level. Moreover, even under low sensing Signal-to-Noise Ratio(SNR) conditions, the system can still resolve the position and velocity information of targets, confirming the capability of OFDM integrated communication and sensing waveforms to support THz narrow beam mobile communication.