Abstract
We discuss a wireless transmission experiment over 110 m using 16 QAM signalling for a net data rate of 115 Gbit/s. The carrier has a frequency of 0.3 THz. It is generated and modulated by photonic techniques. To allow Kramers-Kronig reception of mQAM data, a continuous-wave signal is transmitted at one edge of the signal spectrum. The receiver is a simple Schottky barrier diode. Its output current is digitally processed to recover both modulated quantities, amplitude and phase.
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See [1] (Appendix A): The Fourier transform of \( s(t)=\ln \left(1+x(t)\right)={\sum}_{n=1}^{\infty }{x}^n(t)/n \) for −1 < x(t) ≤ + 1 is a multiply convolution of the spectra \( \left\{\left[\overset{\smile }{x}(f)\ast \overset{\smile }{x}(f)\right]\ast \overset{\smile }{x}(f)\right\}\ast \overset{\smile }{x}(f)\cdots \), and if x(t) is an analytic signal and its spectrum \( \breve{{x}}(f) \) therefore causal, then \( \breve{{s}}(f) \) is also causal, and s(t) is an analytic signal, too.
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Freude, W., Füllner, C., Harter, T., Koos, C., Randel, S. (2022). Wireless THz Transmission Using a Kramers-Kronig Receiver. In: Kürner, T., Mittleman, D.M., Nagatsuma, T. (eds) THz Communications. Springer Series in Optical Sciences, vol 234. Springer, Cham. https://doi.org/10.1007/978-3-030-73738-2_48
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DOI: https://doi.org/10.1007/978-3-030-73738-2_48
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