دورية أكاديمية
Terahertz wireless communication through atmospheric atmospheric turbulence and rain
| العنوان: | Terahertz wireless communication through atmospheric atmospheric turbulence and rain |
|---|---|
| المؤلفون: | Ma, Jianjun |
| المصدر: | Dissertations |
| بيانات النشر: | Digital Commons @ NJIT |
| سنة النشر: | 2016 |
| المجموعة: | Digital Commons @ New Jersey Institute of Technology (NJIT) |
| مصطلحات موضوعية: | Free optical communication, Terahertz, Infrared laser, Atmospheric turbulence, Rain, Scintilation, Other Physics |
| الوصف: | This dissertation focusses on terahertz (THz) wireless communication technology in different weather conditions. The performance of the communication links is mainly studied under propagation through atmospheric turbulence and rain. However, as real outdoor weather conditions are temporally and spatially varying, it is difficult to obtain reproducible atmospheric conditions to verify results of independent measurements making it a challenge to measure and analyze the impact of outdoor atmospheric weather on communication links. Consequently, dedicated indoor weather chambers are designed to produce controllable weather conditions to emulate the real outdoor weather as closely as possible. To emulate turbulent air conditions, an enclosed chamber is developed into which air with controllable airspeeds and temperatures are introduced to generate a variety of atmospheric turbulence for beam propagation. To emulate varying rain conditions, an enclosed chamber is built in which pressurized air forces drops of water through an array of 30 gauge needles. In order to study and compare propagation features of THz links with infrared (IR) links under identical weather conditions, a THz and IR communications lab setup with a maximum data rate of 2.5 Gb/s at 625 GHz carrier frequency and 1.5 μm wavelength, are developed. A usual non return-to-zero (NRZ) format is applied to modulate the IR channel but a duobinary coding technique is used for driving the multiplier chain-based 625 GHz source, which enables signaling at high data rate and higher output power. The power and bit-error rate (BER) on the receiver side are measured, which can be used to analyze the signal performance. To analyze the phase change in the turbulence chamber due to the refractive index change induced by turbulence, a Mach-Zehnder Interferometer with He-Ne laser at 632.8nm is developed. In the same weather conditions, the impact on THz in comparison with IR link is not equivalent due to the spectral dependence on atmospheric turbulence and rain. In the ... |
| نوع الوثيقة: | text |
| وصف الملف: | application/pdf |
| اللغة: | unknown |
| العلاقة: | https://digitalcommons.njit.edu/dissertations/61Test; https://digitalcommons.njit.edu/cgi/viewcontent.cgi?article=1116&context=dissertationsTest |
| الإتاحة: | https://digitalcommons.njit.edu/dissertations/61Test https://digitalcommons.njit.edu/cgi/viewcontent.cgi?article=1116&context=dissertationsTest |
| رقم الانضمام: | edsbas.F274E664 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |