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Analysis on Pulse Shaping in Faster-than-Nyquist System
Yajie Ren,Jiancun Fan,Xinmin Luo,Xi Chen 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.1
In faster-than-Nyquist (FTN) signaling, information symbols are transmitted at a rate higher than that suggested by the Nyquist criterion, which causes unavoidable inter-symbol interference (ISI). As one of the most important part in FTN systems, the selection of shaping pulses draws a lot of attention. Pulse shaping filters are necessary in wireless communication systems to generate band-limited signals and reduce ISI in transmission, and help to decrease the detection complexity as well. For sinc pulses, it has been established that with a small increase in the signaling rate beyond the Nyquist rate, there is no reduction in the minimum Euclidean distance for binary signaling. In this paper, we compare the waveforms of different shaping pulses, and present the ISI with different symbol accelerating factor. Furthermore, we do simulations with different shaping pulses and give the selection of pulses in FTN systems.
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Renlai Zhou,Jiancun Ren,Shuli Lou,Youlun Ju,Yuezhu Wang 한국광학회 2015 Current Optics and Photonics Vol.19 No.1
Up to ~520 μJ broadband mid-infrared (IR) supercontinuum (SC) generation in telecommunicationmultimode fiber (MMF) directly pumped by a 2.054 μm nanosecond Q-switched Tm,Ho:YVO4 laser isdemonstrated. An average output power of 3.64 W is obtained in the band of ~1900 to ~2600 nm, andthe corresponding optic-to-optic conversion efficiency is 67% by considering the coupling efficiency. Thespectrum has extremely high flatness with negligible intensity variation (<2%) in the wavelength intervalof ~2070 to ~2475 nm. The SC long-wavelength edge is limited by the silicon glass material loss, andby optimizing the MMF length, the SC spectrum could extend out to ∼2.6 μm. The output SC pulseshapes are measured at different output powers, and no splits are found. The SC laser beam is nearlydiffraction limited with an M2 =1.15 in 2.1 μm measured by the traveling knife-edge method, and thelaser beam spot is monitored by an infrared vidicon camera
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