紅外語音通信系統(tǒng)的研究與設計
發(fā)布時間：2018-11-15 06:59
【摘要】：個人移動通信和多媒體業(yè)務量的增加,使通信技術朝著系統(tǒng)寬帶化、靈活性的方向發(fā)展。無線光通信結合了光纖通信的高帶寬和射頻無線通信的靈活性優(yōu)點,更適應現(xiàn)代通信技術的發(fā)展。紅外語音通信屬于室內(nèi)無線光通信研究的范疇,由于其發(fā)射角度的和傳輸距離的限制,能夠更好的防止被監(jiān)聽,具有更好的安全性,且系統(tǒng)結構簡單,成本低,實際應用價值更高。但紅外語音通信系統(tǒng)的發(fā)射器功率限制了其信息傳輸?shù)木嚯x,因此紅外語音通信多用于點對點的視距通信中。因此本文主要研究重點為視距范圍內(nèi)的室內(nèi)紅外語音通信系統(tǒng),由以下幾個方面組成:首先,根據(jù)國內(nèi)外參考文獻對所研究課題進行總結,其中包括紅外語音通信系統(tǒng)的研究背景、紅外無線通信技術相比較射頻通信的優(yōu)勢,國內(nèi)外紅外語音通信系統(tǒng)現(xiàn)階段研究的狀態(tài)、紅外語音通信系統(tǒng)的發(fā)展趨勢等方面,該部分主要建立在以往閱讀文獻的基礎上,對所研究的領域有了較全面的認識,為本課題研究打下基礎。其次,提出紅外語音通信系統(tǒng)的基本模型,由于紅外光的不可見性,穩(wěn)重采用輻射度學對紅外輻射進行研究,引出了幾種常見的紅外輻射量;紅外發(fā)光管和接收管的研究是紅外語音通信系統(tǒng)設計的關鍵,這部分對紅外的光學器件進行了分析,在此基礎上選出了適合紅外語音通信系統(tǒng)設計的器件。再次,從紅外無線通信的強度檢測/直接接收系統(tǒng)(IM/DD)模型得出衡量紅外無線通信信道的性能指標:系統(tǒng)脈沖響應。結合紅外光輻射理論,對紅外無線通信發(fā)射器、接收器傳輸功率和通信信道進行研究,建立紅外通信信道的數(shù)學模型,從理論上詳細介紹了系統(tǒng)的脈沖響應計算方法,并利用matlab實現(xiàn)對脈沖響應進行仿真,通過改變仿真參數(shù)分析紅外無線傳輸中的各項指標對系統(tǒng)性能的影響,研究結果表明:紅外發(fā)射器發(fā)出的紅外光脈沖經(jīng)過反射后到達接收器會產(chǎn)生多徑效應,脈沖響應隨著反射次數(shù)的增加呈下降趨勢。但在室內(nèi)傳輸過程中,由于傳輸距離只有10米左右,受多徑衰落的影響不大,可以利用紅外光的反射特性,增加中繼設備,提高紅外語音通信系統(tǒng)的靈活性,提高系統(tǒng)的傳輸距離。最后,從系統(tǒng)的整體設計入手,完成紅外語音通信系統(tǒng)各個功能模塊的設計。闡述了紅外語音通信系統(tǒng)進行脈沖調制的必要性,給出了幾種常用的脈沖調制方式的概念,結合傳統(tǒng)紅外語音通信的設計經(jīng)驗,選用PWM調制作為紅外語音通信系統(tǒng)的調制方式。根據(jù)D類音頻放大器的基本原理和采樣定理等相關理論,確定了紅外語音系統(tǒng)的各個功能模塊的參數(shù),采用大功率的紅外發(fā)光二極管和中繼電路來增加紅外語音通信系統(tǒng)的傳輸距離,最終完成了紅外語音通信系統(tǒng)的設計。本文的重點在第四章紅外語音通信系統(tǒng)的設計部分。
[Abstract]:With the increase of personal mobile communication and multimedia traffic, communication technology develops towards the direction of system broadband and flexibility. Wireless optical communication combines the advantages of high bandwidth of optical fiber communication and flexibility of radio frequency wireless communication, so it is more suitable for the development of modern communication technology. Infrared speech communication belongs to the research field of indoor wireless optical communication. Because of the limitation of its transmitting angle and transmission distance, it can better prevent being monitored, have better security, and the system structure is simple and the cost is low. The practical application value is higher. However, the transmitter power of the infrared speech communication system limits the distance of its information transmission, so the infrared speech communication is mostly used in point-to-point line-of-sight communication. Therefore, this paper mainly focuses on the indoor infrared speech communication system in the range of sight, which is composed of the following aspects: firstly, according to the domestic and foreign references, the research topics are summarized. It includes the research background of the infrared speech communication system, the advantages of the infrared wireless communication technology compared with the radio frequency communication, the current research status of the infrared voice communication system at home and abroad, the development trend of the infrared voice communication system, etc. This part is mainly based on the previous reading literature, and has a more comprehensive understanding of the field of study, which lays a foundation for the research of this subject. Secondly, the basic model of infrared speech communication system is put forward. Due to the invisibility of infrared light, infrared radiation is studied by using radiance and several kinds of infrared radiation are introduced. The research of infrared luminous tube and receiver is the key to the design of infrared speech communication system. In this part, the optical devices of infrared are analyzed, and the devices suitable for the design of infrared speech communication system are selected. Thirdly, from the intensity detection / direct receiving system (IM/DD) model of infrared wireless communication, the performance index of infrared wireless communication channel is obtained: system impulse response. Combined with infrared radiation theory, the transmission power and communication channel of infrared wireless communication transmitter and receiver are studied, the mathematical model of infrared communication channel is established, and the calculation method of system pulse response is introduced in detail theoretically. The pulse response is simulated by using matlab. By changing the simulation parameters, the influence of various indexes in infrared wireless transmission on the performance of the system is analyzed. The results show that the infrared light pulse emitted by the infrared emitter will produce multipath effect after it reaches the receiver, and the pulse response will decrease with the increase of the reflection times. However, in the process of indoor transmission, the transmission distance is only about 10 meters, which is not affected by multipath fading, so we can use the reflection characteristic of infrared light to increase the relay equipment and improve the flexibility of the infrared voice communication system. Improve the transmission distance of the system. Finally, starting with the overall design of the system, the design of each functional module of the infrared voice communication system is completed. This paper expounds the necessity of pulse modulation in infrared speech communication system, and gives the concepts of several common pulse modulation methods. Combined with the design experience of traditional infrared speech communication, PWM modulation is selected as the modulation mode of infrared speech communication system. According to the basic principle of class D audio amplifier and relevant theories such as sampling theorem, the parameters of each functional module of infrared speech system are determined. High power infrared light-emitting diode and relay circuit are used to increase the transmission distance of the infrared speech communication system. Finally, the design of the infrared voice communication system is completed. This paper focuses on the fourth chapter of the design of infrared voice communication system.
【學位授予單位】：延安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN929.1
本文編號：2332483
[Abstract]:With the increase of personal mobile communication and multimedia traffic, communication technology develops towards the direction of system broadband and flexibility. Wireless optical communication combines the advantages of high bandwidth of optical fiber communication and flexibility of radio frequency wireless communication, so it is more suitable for the development of modern communication technology. Infrared speech communication belongs to the research field of indoor wireless optical communication. Because of the limitation of its transmitting angle and transmission distance, it can better prevent being monitored, have better security, and the system structure is simple and the cost is low. The practical application value is higher. However, the transmitter power of the infrared speech communication system limits the distance of its information transmission, so the infrared speech communication is mostly used in point-to-point line-of-sight communication. Therefore, this paper mainly focuses on the indoor infrared speech communication system in the range of sight, which is composed of the following aspects: firstly, according to the domestic and foreign references, the research topics are summarized. It includes the research background of the infrared speech communication system, the advantages of the infrared wireless communication technology compared with the radio frequency communication, the current research status of the infrared voice communication system at home and abroad, the development trend of the infrared voice communication system, etc. This part is mainly based on the previous reading literature, and has a more comprehensive understanding of the field of study, which lays a foundation for the research of this subject. Secondly, the basic model of infrared speech communication system is put forward. Due to the invisibility of infrared light, infrared radiation is studied by using radiance and several kinds of infrared radiation are introduced. The research of infrared luminous tube and receiver is the key to the design of infrared speech communication system. In this part, the optical devices of infrared are analyzed, and the devices suitable for the design of infrared speech communication system are selected. Thirdly, from the intensity detection / direct receiving system (IM/DD) model of infrared wireless communication, the performance index of infrared wireless communication channel is obtained: system impulse response. Combined with infrared radiation theory, the transmission power and communication channel of infrared wireless communication transmitter and receiver are studied, the mathematical model of infrared communication channel is established, and the calculation method of system pulse response is introduced in detail theoretically. The pulse response is simulated by using matlab. By changing the simulation parameters, the influence of various indexes in infrared wireless transmission on the performance of the system is analyzed. The results show that the infrared light pulse emitted by the infrared emitter will produce multipath effect after it reaches the receiver, and the pulse response will decrease with the increase of the reflection times. However, in the process of indoor transmission, the transmission distance is only about 10 meters, which is not affected by multipath fading, so we can use the reflection characteristic of infrared light to increase the relay equipment and improve the flexibility of the infrared voice communication system. Improve the transmission distance of the system. Finally, starting with the overall design of the system, the design of each functional module of the infrared voice communication system is completed. This paper expounds the necessity of pulse modulation in infrared speech communication system, and gives the concepts of several common pulse modulation methods. Combined with the design experience of traditional infrared speech communication, PWM modulation is selected as the modulation mode of infrared speech communication system. According to the basic principle of class D audio amplifier and relevant theories such as sampling theorem, the parameters of each functional module of infrared speech system are determined. High power infrared light-emitting diode and relay circuit are used to increase the transmission distance of the infrared speech communication system. Finally, the design of the infrared voice communication system is completed. This paper focuses on the fourth chapter of the design of infrared voice communication system.
【學位授予單位】：延安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN929.1
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相關碩士學位論文 前1條
1 董光輝;室內(nèi)無線紅外通信調制技術研究[D];哈爾濱工程大學;2009年
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