Carrierless Amplitude and Phase Modulation for Terahertz Communications
Date
2023
Authors
Shehata, M.
Wang, K.
Withayachumnankul, W.
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Journal article
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IEEE Journal of Selected Topics in Quantum Electronics, 2023; 29(5):8600714-1-8600714-14
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Mohamed Shehata, Ke Wang and Withawat Withayachumnankul
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Abstract
Terahertz communications has been foreseen as a key enabler to the sixth generation (6G) of wireless communications systems. However, the design of spectrally-efficient waveforms and modulation schemes is an ongoing challenge in this regime. In this article, we propose and experimentally demonstrate the transmission of M-ary carrierless amplitude and phase (CAP) modulated signals using a 253 GHz photomixing-based terahertz wireless communications system combined with the optical transmission over a 10-km standard single mode fiber (SSMF). Experimental results show that the CAP modulation technique has a capability to support the high-speed transmission of terahertz signals over a wide range of data rates from 4 Gbit/s (BER > 10⁻³) to 96 Gbit/s (BER > 10⁻¹), based solely on optical intensity modulation at the transmitter side and terahertz envelope detection at the receiver side. Consequently, M-ary CAP can potentially be adopted as a low-complexity waveform and modulation contender to simplify the transceivers architectures for 6G terahertz communications systems, without sacrificing the high throughput targeted by these systems.
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© 2023 IEEE.