The Influence of Turbulence Scintillation on The BER of THz Wireless Communication
Atmospheric turbulence causes random fluctuation of terahertz beam, therefore results in bit error for data transmission. This paper studies the influence of turbulence scintillation on the Bit-Error-Rate (BER) of THz wireless communication system, gives
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The Influence of Turbulence Scintillation on The BER of THz Wireless Communication Lianwei Bao, Hengkai Zhao, Guoxin Zheng and Weiwei Zhao
Abstract Atmospheric turbulence causes random fluctuation of terahertz beam, therefore results in bit error for data transmission. This paper studies the influence of turbulence scintillation on the Bit-Error-Rate (BER) of THz wireless communication system, gives the relationship between effective transmission distance and frequency under different BER performance. Research shows that the BER of spherical wave is less than that of plane wave in the same conditions; frequency and transmission distance causes important influence on the perfomance of BER; the effective transmission distance decreases along with frequency increasing in the case of a certain BER, and the effective transmission distance of spherical wave is longer than the effective transmission distance of plane wave under the same conditions. Keywords THz
Turbulence Scintillation BER Structure constant
19.1 Introduction Free space THz wireless transmission technology is a means of communication which employs the terahertz beam as an information carrier in the atmospheric channel. The influence of the atmosphere on the propagation of THz waves is an essential area of research for the emerging field of THz telecommunications. There are two main factors which affect the quality of atmospheric channel, that is L. Bao H. Zhao (&) G. Zheng W. Zhao Key Laboratory of Specialty Fiber Optics and Optical Access Networks, School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China e-mail: [email protected]
W. Lu et al. (eds.), Proceedings of the 2012 International Conference on Information Technology and Software Engineering, Lecture Notes in Electrical Engineering 211, DOI: 10.1007/978-3-642-34522-7_19, Ó Springer-Verlag Berlin Heidelberg 2013
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atmospheric extinction and atmospheric turbulence. So far, several literatures have done some study about the effect of atmospheric extinction. It is still a lack of study for THz band even though there have been some literatures discussed the effect of atmospheric turbulence in optical band [1]. The atmospheric turbulence would cause random fluctuation of the refractive index commonly. It will led to the strength random fluctuation and the phase random fluctuation of the received beam in time and space, that is scintillation of atmospheric turbulence [2]. The effect of scintillation is equivalent to superimposing the atmospheric turbulence noise on the basis of the original signal. It will lead to the ratio of signal to noise on receiver becoming lower and cause the bit error rate increasing [3], which will affect the stability and reliability of THz wireless communication seriously. Therefore, it is necessary to study the relationship between the system bit error rate and the scintillation of the terahertz wave caused by atmospheric turbulence.
19.2 Basic Theory In 2001, ITU-R formally adopted the
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