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In the context of indoor terahertz communications, the performance of the system is significantly affected by radio frequency (RF) impairments. These impairments are caused by a number of factors, including path loss, noise introduced by the channel, and attenuation of coaxial cables and equipment with frequency changes. This paper presents a terahertz communication system based on the PXIe platform and baseband signal processing using LabVIEW. The Bit Error Rate (BER) and constellation chart of Amplitude Phase Shift Keying (APSK) modulation were analyzed before and after constellation optimization, as well as for phase shift keying (APSK) modulation, for the 300 GHz band with varying signal-to-noise ratios. Effective compensation methods were employed to address the In-phase Quadrature (IQ) imbalance resulting from Radio Frequency (RF) impairments. The observation of the experimentally measured Error Vector Magnitude (EVM) demonstrates that the APSK modulation and the adopted RF impairments compensation methods can effectively enhance the performance of the communication system. This study provides a valuable reference point for the design and optimization of future indoor terahertz communication systems.

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Performance Analysis and RF Impairments Compensation of APSK Modulation in PXIe-Based 300 GHz Indoor Communication System

  • 会议论文

  • 发表日期：

    2025年

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  • Zhuoyu Zhang,
  • Yunchuan Liu,
  • Wenyi Zhang,
  • Cunlin Zhang,
  • Jingsuo He

摘要

In the context of indoor terahertz communications, the performance of the system is significantly affected by radio frequency (RF) impairments. These impairments are caused by a number of factors, including path loss, noise introduced by the channel, and attenuation of coaxial cables and equipment with frequency changes. This paper presents a terahertz communication system based on the PXIe platform and baseband signal processing using LabVIEW. The Bit Error Rate (BER) and constellation chart of Amplitude Phase Shift Keying (APSK) modulation were analyzed before and after constellation optimization, as well as for phase shift keying (APSK) modulation, for the 300 GHz band with varying signal-to-noise ratios. Effective compensation methods were employed to address the In-phase Quadrature (IQ) imbalance resulting from Radio Frequency (RF) impairments. The observation of the experimentally measured Error Vector Magnitude (EVM) demonstrates that the APSK modulation and the adopted RF impairments compensation methods can effectively enhance the performance of the communication system. This study provides a valuable reference point for the design and optimization of future indoor terahertz communication systems.