本文選題：太赫茲波 + 寬帶無線通信�。� 參考：《電子科技大學》2017年碩士論文

【摘要】：太赫茲波的高度定向性與太赫茲頻段的高帶寬,使得太赫茲通信技術在寬帶無線通信及個域網系統(tǒng)方面具有很強的應用價值。通過對太赫茲波在大氣中傳播問題的研究,可以發(fā)現,大氣對于太赫茲波存在一個傳輸窗口,大概為200-300GHz的窗口。不過,要獲得可行的太赫茲通信解決方案,需要克服很多嚴峻的技術障礙。第一,當有障礙物(比如:人、車輛)臨時阻擋了發(fā)射機和接收機之間的、正在進行數據傳輸的通路時——從無線路由到平板電腦,由于太赫茲波在空氣中傳輸是高度定向的,怎樣變更無線信號的傳輸路徑稱為一個亟待解決的問題。第二,太赫茲無線數據鏈路的形式與今天室內無線通信系統(tǒng)截然不同,室內太赫茲通信系統(tǒng)鏈路的實現,不僅僅是現有技術的擴展,而且必須融入許多新的思路和理念。本文提出了一種適合于太赫茲點對點無線通信的基帶電路設計,在基帶鏈路基礎搭建了330GHz太赫茲無線點對點通信系統(tǒng)。整個基帶系統(tǒng)分為發(fā)射機和接收機兩部分。發(fā)射機負責對完成信源編碼的信號進行信道編碼,加擾,加入同步序列,發(fā)射等處理,接收機完成模數轉換,幀同步,解擾,信道譯碼。在發(fā)射端,PC完成信源編碼,打包和壓縮,經USB2.0接口將信號傳輸到FPGA,FPGA完成信道編碼(信道編碼使用(2,1,7)卷積碼編碼),加擾,加入同步序列(同步序列使用的是Golay序列,參考了802.11ad協(xié)議中的Ga64與Gb64序列)和基帶發(fā)射(發(fā)射模塊是VIRTEX6芯片(芯片型號:xc6vlx130t)自帶的高速串行GTX發(fā)射器)。在接收端,解調回來的基帶信號經過兩倍率采樣16bit量化進行模數轉換,截取13bit的采樣數據經過2倍率抽樣的Golay序列相關器進行幀同步,同時通過比較相關值從兩路抽樣信號中選取信噪比最大的一路信號進行解擾與信道譯碼,信道譯碼采用(2,1,7)Viterbi譯碼算法(3bit軟判決),將譯碼結束的一幀數據經過USB2.0傳輸到接收PC端,接收PC端完成信源譯碼,解壓與收包;其中golay序列相關器,解擾器,viterbi譯碼器和usb接口控制器由FPGA實現。最終實驗完成一種太赫茲無線通信基帶鏈路的電路設計與FPGA實現,誤碼率可達10E-8,50MHz帶寬,在330GHz信道上完成了720p視頻傳輸的業(yè)務,傳輸距離11m。
[Abstract]:Due to the high directivity of terahertz wave and the high bandwidth of terahertz band, terahertz communication technology has strong application value in wideband wireless communication and personal area network system. By studying the propagation of terahertz waves in the atmosphere, it can be found that there is a transmission window for terahertz waves in the atmosphere, which is about 200-300 GHz. However, to achieve a viable terahertz communication solution, there are many serious technical obstacles to overcome. First, when obstacles (such as people, vehicles) temporarily block the path between the transmitter and the receiver that are transmitting data from wireless to the tablet, because terahertz waves are highly oriented in the air, How to change the transmission path of wireless signal is an urgent problem to be solved. Secondly, the form of THz wireless data link is very different from today's indoor wireless communication system. The realization of indoor terahertz communication system link is not only an extension of existing technology, but also must be incorporated into many new ideas and concepts. This paper presents a baseband circuit design for terahertz point-to-point wireless communication. A 330GHz terahertz wireless point-to-point communication system is built on the baseband link basis. The whole baseband system is divided into transmitter and receiver. The transmitter is responsible for channel coding, scrambling, adding synchronization sequence, transmitting and so on. The receiver completes A / D conversion, frame synchronization, descrambling and channel decoding. At the transmitter PC, the source code is encoded, packaged and compressed, and the signal is transmitted to FPGA via USB2.0 interface to complete the channel coding (channel coding is done with the convolutional code (the channel code is coded using a 2 / 2 / 1 / 7) convolutional code), scrambling, and adding a synchronous sequence (the synchronous sequence is a Golay sequence). Reference is made to the Ga64 and Gb64 sequences in the 802.11ad protocol and the baseband emitter (the transmitter module is VIRTEX6 chip (chip type: xc6vlx130t) with its own high-speed serial GTX transmitter. At the receiving end, the demodulated baseband signal is converted by a two-rate sampling 16bit quantization, and the sampling data of 13bit is intercepted for frame synchronization through a two-rate sampling Golay sequence correlator. At the same time, by comparing the correlation values, the first signal with the largest SNR is selected from the two sampling signals for descrambling and channel decoding. The channel decoding adopts a 3bit soft decision algorithm for channel decoding, and transmits a frame of data from the end of decoding to the receiving PC through USB2.0. The golay sequence correlator, descrambler Viterbi decoder and usb interface controller are implemented by the receiver PC. Finally, the circuit design and FPGA implementation of a terahertz wireless communication baseband link are completed. The BER can reach 10E-8N 50MHz bandwidth. The 720p video transmission service is completed on the 330GHz channel, and the transmission distance is 11m.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN92

【參考文獻】

相關期刊論文 前2條

1 劉志華;郭付才;彭新偉;陳吉東;;基于CY7C68013A的FPGA配置和通信接口設計[J];電子技術應用;2013年02期

2 羅向東;;基于FPGA與CY7C68013A的USB接口系統(tǒng)設計[J];科技廣場;2010年06期

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本文編號：2025802