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arXiv 2202.10035eess.SP
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基于DFT扩频的正交时频叠加太赫兹通感一体化系统

DFT-Spread Orthogonal Time Frequency Space System with Superimposed Pilots for Terahertz Integrated Sensing and Communication

Yongzhi Wu, Chong Han, Zhi Chen

摘要:

太赫兹(THz)通感一体化(ISAC)技术是一种能够同时实现太比特每秒(Tbps)传输和毫米级精确环境或人类活动传感的交叉学科技术。然而,无论是通信性能和传感精度的影响,多普勒效应,这是特别严重的太赫兹波段。此外,峰均功率比(PAPR)降低了太赫兹功率放大器(PA)的效率。提出了一种基于离散傅里叶变换扩频正交时频空间(DFT-s-OTFS)的THz ISAC系统,该系统采用叠加导频技术,提高了系统对多普勒效应的鲁棒性,降低了系统的峰均比。然后,开发了两阶段感测参数估计算法以将感测功能集成到DFT-s-OTFS波形中。同时,提出了一种低复杂度的迭代信道估计和基于共轭梯度均衡器的数据检测方法来恢复DFT-s-OTFS的数据符号。与OTFS相比,所提出的DFT-s-OTFS波形可以将PA效率平均提高10%。仿真结果表明,所提出的THz DFT-s-OTFS系统两阶段感知估计算法能够实现毫米级的距离估计精度和分米/秒级的速度估计精度。仿真结果表明,在DFT-s-OTFS系统中,叠加导频辅助的迭代数据检测方法是有效的,且误比特率性能不会因多普勒效应而降低。

英文摘要:

Terahertz (THz) integrated sensing and communication (ISAC) is a promising interdisciplinary technology that realizes simultaneously transmitting Terabit-per-second (Tbps) and millimeter-level accurate environment or human activity sensing. However, both communication performance and sensing accuracy are influenced by the Doppler effects, which are especially severe in the THz band. Moreover, peak-to-average power ratio (PAPR) degrades the THz power amplifier (PA) efficiency. In this paper, a discrete Fourier transform spread orthogonal time frequency space (DFT-s-OTFS) system with superimposed pilots is proposed to improve the robustness to Doppler effects and reduce PAPR for THz ISAC. Then, a two-phase sensing parameter estimation algorithm is developed to integrate sensing functionality into the DFT-s-OTFS waveform. Meanwhile, a low-complexity iterative channel estimation and data detection method with a conjugate gradient based equalizer is proposed to recover the data symbols of DFT-s-OTFS. The proposed DFT-s-OTFS waveform can improve the PA efficiency by 10% on average compared to OTFS. Simulation results demonstrate that the proposed two-phase sensing estimation algorithm for THz DFT-s-OTFS systems is able to realize millimeter-level range estimation accuracy and decimeter-per-second-level velocity estimation accuracy. Moreover, the effectiveness of the iterative method for data detection aided by superimposed pilots in DFT-s-OTFS systems is validated by the simulations and the bit error rate performance is not degraded by the Doppler effects.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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