摘要：
Aiming at impact of height and geographical conditions of unmanned aircraft inspection,the paper designs a data link communication system to handle breakage of territory,multi-path effects and declining of frequency selection and strong electromagnetic inference.Therefore,this article introduces and analyzes the components and function modules of the sys-tem.The system adopts coded orthogonal frequency division multiplexing (COFDM),high-speed data processing technology based on field programmable gate array(FPGA),high-linearity amplifier technology and data link control protocol technolo-gy,guaranteeing reliable and effective transmission of data collection and information control.%針對無人機巡檢受飛行高度和地理條件遮擋的影響,設(shè)計了1套帶中繼鏈路的通信系統(tǒng),克服地形阻擋、多徑效應(yīng)、頻率選擇性衰落和外界強電磁干擾的影響,為此,介紹和分析了該中繼鏈路通信系統(tǒng)的組成和各項功能模塊。該通信鏈路系統(tǒng)特別采用了編碼正交頻分復(fù)用(coded orthogonal frequency division multiplexing, COFDM)調(diào)制解調(diào)技術(shù)、基于(field programmable gate array,FPGA)的高速數(shù)據(jù)處理技術(shù)、高線性功放技術(shù)及滿足特定要求的數(shù)據(jù)鏈路控制協(xié)議技術(shù),大大保障了無人機巡檢實現(xiàn)采集數(shù)據(jù)和控制信息的有效可靠傳輸。
摘要：
In order to improve the ability in responding to emergent hazards, Anhui Electric Power Company establishes an emergency communication system based on 4G communication technology. Multiple communication modes are proposed, including 3G public network and microwave self-organized network, thus to realize no-blind-area coverage in emergency zone. Meanwhile, a variety of voice network interconnection modules based on IP soft switch technology and DSP signal processing technology are designed, and the network communication problems in complex environment solved. Thus different types of speech communication terminal are integrated to achieve inter connectivity; while in video transmission, microwave communication technology is utilized to achieve real-time speech and video transmission when the public network breaks off. The system could provide a new communication means for emergency rescue personnel.% 為提高應(yīng)對突發(fā)事件的能力，安徽省電力公司建設(shè)了基于4G通信技術(shù)的應(yīng)急通信系統(tǒng)。提出了3G 公網(wǎng)，微波自組網(wǎng)多種通信模式互補通信的方案，實現(xiàn)應(yīng)急區(qū)域無盲區(qū)覆蓋；設(shè)計開發(fā)了基于 IP軟交換技術(shù)及 DSP 信號處理技術(shù)的多種語音網(wǎng)絡(luò)互連模塊，可以將不同類型的語音通信終端融合起來，實現(xiàn)互連互通，在視頻傳輸方面，利用微波通信技術(shù)，解決了公網(wǎng)中斷的應(yīng)急情況下語音視頻的實時傳輸。為應(yīng)急救援人員提供了新的通信手段。
摘要：
數(shù)字視頻地面廣播（DVB—T）標準是目前廣播電視業(yè)以及世界上多國數(shù)字地面電視接收測試中評價最高的地面電視廣播標準，其技術(shù)也已經(jīng)很成熟。DVB—T系統(tǒng)采用了編碼正交頻分復(fù)用（COFDM）技術(shù)，離散導(dǎo)頻的插入和數(shù)據(jù)塊本身的循環(huán)特性，使得信道估計和均衡的算法簡單易行，但同時也降低了系統(tǒng)的頻譜利用率。針對該系統(tǒng)接收端的信道估計和均衡這兩個問題，進行了理論上的研究，并用Matlah進行了仿真，顯示了其在多徑信道下的性能。%DVB - T gets the highest evaluation among all the tested standards of several countries in the broadcasting industry, along with its mature technology. DVB - T system adopts COFDM technology. Both the insert of scattered pilot and the cycle characteristic of data block make the channel estimation and equalization algorithm very easy which this paper will deal with, but meanwhile the pilot reduces the spectrum utilization. The performance of DVB - T in multi - channel will be shown by my simulation using Matlab.
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