發(fā)布時(shí)間：2018-04-27 02:35

  本文選題：短距離無線通信 + 60GHz毫米波��； 參考：《南京信息工程大學(xué)》2017年碩士論文

【摘要】：近年來,無線通信技術(shù)快速發(fā)展,毫米波這一新興通信技術(shù)為大數(shù)據(jù)短距離高速率傳輸提供了可靠的技術(shù)支持。無線通信技術(shù)在日常生產(chǎn)生活中越來越緊密的圍繞在我們周圍,比如我們的手機(jī)以及各種需要高速流量的手機(jī)APP、數(shù)字電視、視頻點(diǎn)播等。為了實(shí)現(xiàn)高速帶寬無線接入,只能往高頻無線頻譜資源方向開發(fā),無線通信技術(shù)中領(lǐng)先的技術(shù)要屬于毫米波通信,毫米波相對(duì)于其他電磁波的特點(diǎn)是頻率高,毫米波還有波長(zhǎng)短、帶寬大、保密性高等優(yōu)點(diǎn)。毫米波只能在短距離內(nèi)傳輸,空氣、環(huán)境、障礙物等因素都會(huì)對(duì)毫米波無線通信產(chǎn)生影響,使毫米波傳輸環(huán)境變復(fù)雜。因此,如何正確地描述電磁波短距離傳輸,對(duì)毫米波無線通信信道的關(guān)鍵參數(shù)獲取有著很重要的意義。本文的工作主要在以下幾個(gè)方面:首先,對(duì)短距離無線通信系統(tǒng)進(jìn)行概述,介紹天線陣列利用發(fā)射天線和接受天線空間排列實(shí)現(xiàn)傳輸信號(hào)的分集與復(fù)用;分析短距離無線信道傳輸和天線陣列的關(guān)系,對(duì)無線信道在陣列模型下進(jìn)行信道建模并提出陣列天線毫米波無線通信的理論解釋與分析。結(jié)果表明,到達(dá)角(Angle of Arrival, AOA)和到達(dá)高度(Elevation of Arrival, EOA)的對(duì)鏈路都會(huì)產(chǎn)生影響。且均勻矩形陣列(Uniform Rectangular Array, URA)相對(duì)于均勻線形陣列(Uniform Linear Array, ULA )和均勻圓形陣列(Uniform Circular Array, UCA)在信號(hào)傳輸中更有優(yōu)勢(shì)。其次,進(jìn)一步研究與討論了短距離無線通信毫米波信號(hào)在室內(nèi)環(huán)境下的鏈路損耗,觀測(cè)比較ULA和URA在室外空間中的鏈路損耗模型。推導(dǎo)出電磁波在三維空間下的均勻線形陣列和均勻矩形陣列的空間衰落相關(guān)性表達(dá)式。對(duì)比毫米波鏈路損耗在不同極化模式下的吻合度。結(jié)果表明,相同的極化模式下,介電常數(shù)低的材質(zhì)鏈路損耗小,反之介電常數(shù)大則鏈路損耗大。比較電磁波在垂直極化模式下和水平極化模式下的鏈路損耗,所得出的結(jié)果表明:垂直極化模式造成的衰落和相比于水平極化模式損耗較小。然后,分析室內(nèi)環(huán)境下短距離無線信道,提出適用于60GHz的室內(nèi)環(huán)境下短距離無線信道傳輸模型。推導(dǎo)出基于接收機(jī)和發(fā)射機(jī)兩端距反射面間距的反射系數(shù)表達(dá)式以及基于接收機(jī)發(fā)射機(jī)距離的路徑損耗相關(guān)函數(shù)表達(dá)式,驗(yàn)證了 IEEE工作組發(fā)布的典型無影響鏈路的路徑損耗模型的在實(shí)際情況下不準(zhǔn)確。結(jié)果表明,在現(xiàn)有的傳輸模式下。默認(rèn)毫米波反射系數(shù)” R=-1”會(huì)帶來較大的誤差。最后,針對(duì)60GHz毫米波在室內(nèi)環(huán)境下傳輸受移動(dòng)人體的影響做出理論研究,提出一種60GHz在室內(nèi)環(huán)境下移動(dòng)人體導(dǎo)致的陰影衰落擴(kuò)展計(jì)算三路徑切面模型,在頻率域范圍和時(shí)間域范圍將計(jì)算結(jié)果和實(shí)驗(yàn)結(jié)果進(jìn)行對(duì)比。結(jié)果表明,提出的模型與計(jì)算結(jié)果不能很好的吻合,需要改進(jìn)毫米波性能評(píng)估的計(jì)算模型。
[Abstract]:In recent years, wireless communication technology has developed rapidly. Millimeter wave, a new communication technology, provides reliable technical support for large data short distance and high rate transmission. Wireless communication technology is becoming more and more closely around us in daily production and life, such as our mobile phone and various kinds of mobile phone APP, digital TV, which need high speed traffic. In order to achieve high-speed bandwidth wireless access, it can only be developed in the direction of high frequency radio spectrum resources. The leading technology in wireless communication technology belongs to millimeter wave communication. Millimeter wave is characterized by high frequency, millimeter wave and short wave length, high bandwidth and high security. Millimeter wave can only be in short distance. The transmission, air, environment, obstacle and other factors will affect the millimeter wave wireless communication, and make the millimeter wave transmission environment complicated. Therefore, how to correctly describe the short distance transmission of electromagnetic wave is of great significance for obtaining the key parameters of the millimeter wave wireless communication channel. The work of this paper is mainly in the following aspects: first Firstly, the short distance wireless communication system is summarized. The antenna array is used to realize the diversity and reuse of the transmission signal by using the transmitting antenna and receiving antenna space arrangement. The relationship between the short distance wireless channel transmission and the antenna array is analyzed. The channel modeling is carried out under the array model and the array antenna millimeter wave wireless communication is proposed. The results show that the arrival angles (Angle of Arrival, AOA) and the altitude of arrival (Elevation of Arrival, EOA) have an impact on the link. A) is more advantageous in signal transmission. Secondly, we further study and discuss the link loss of the short distance wireless communication millimeter wave signal in the indoor environment, compare the link loss model of ULA and URA in the outdoor space, and derive the correlation between the uniform linear array of the electromagnetic wave in the three-dimensional space and the spatial fading of the uniform rectangular array. The results show that the link loss of the millimeter wave link loss in different polarization modes is compared. The results show that, under the same polarization mode, the material link loss with low dielectric constant is small, and on the contrary, the loss of link loss is large when the dielectric constant is large. The results show that the link loss under the vertical polarization mode and the horizontal polarization mode is compared. The fading caused by vertical polarization mode and the loss of the horizontal polarization mode are smaller. Then, the short distance wireless channel in the indoor environment is analyzed, and the short distance wireless channel transmission model suitable for 60GHz is proposed. The expression of reflection coefficient based on the spacing of the reflector surface of the receiver and transmitter is derived and the connection is based on the connection. The path loss correlation function expression of the distance of the transceiver shows that the path loss model of the typical non impact link issued by the IEEE working group is inaccurate in the actual case. The result shows that the default millimeter wave reflection coefficient "R=-1" will bring greater error in the current transmission mode. Finally, the 60GHz millimeter wave is used. A theoretical study on the influence of mobile human body in indoor environment is made, and a three path section model is proposed to calculate the shadow fading expansion caused by 60GHz in the indoor environment. The results are compared with the experimental results in the range of frequency domain and time domain. The results show that the proposed model and the calculation result can not be very good. Good agreement is needed to improve the calculation model of millimeter wave performance evaluation.

【學(xué)位授予單位】：南京信息工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN928

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本文編號(hào)：1808819