【摘要】：個(gè)人移動(dòng)通信和多媒體業(yè)務(wù)量的增加,使通信技術(shù)朝著系統(tǒng)寬帶化、靈活性的方向發(fā)展。無(wú)線(xiàn)光通信結(jié)合了光纖通信的高帶寬和射頻無(wú)線(xiàn)通信的靈活性?xún)?yōu)點(diǎn),更適應(yīng)現(xiàn)代通信技術(shù)的發(fā)展。紅外語(yǔ)音通信屬于室內(nèi)無(wú)線(xiàn)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(tīng),具有更好的安全性,且系統(tǒng)結(jié)構(gòu)簡(jiǎn)單,成本低,實(shí)際應(yīng)用價(jià)值更高。但紅外語(yǔ)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(yǔ)音通信多用于點(diǎn)對(duì)點(diǎn)的視距通信中。因此本文主要研究重點(diǎn)為視距范圍內(nèi)的室內(nèi)紅外語(yǔ)音通信系統(tǒng),由以下幾個(gè)方面組成:首先,根據(jù)國(guó)內(nèi)外參考文獻(xiàn)對(duì)所研究課題進(jìn)行總結(jié),其中包括紅外語(yǔ)音通信系統(tǒng)的研究背景、紅外無(wú)線(xiàn)通信技術(shù)相比較射頻通信的優(yōu)勢(shì),國(guó)內(nèi)外紅外語(yǔ)音通信系統(tǒng)現(xiàn)階段研究的狀態(tài)、紅外語(yǔ)音通信系統(tǒng)的發(fā)展趨勢(shì)等方面,該部分主要建立在以往閱讀文獻(xiàn)的基礎(chǔ)上,對(duì)所研究的領(lǐng)域有了較全面的認(rèn)識(shí),為本課題研究打下基礎(chǔ)。其次,提出紅外語(yǔ)音通信系統(tǒng)的基本模型,由于紅外光的不可見(jiàn)性,穩(wěn)重采用輻射度學(xué)對(duì)紅外輻射進(jìn)行研究,引出了幾種常見(jiàn)的紅外輻射量;紅外發(fā)光管和接收管的研究是紅外語(yǔ)音通信系統(tǒng)設(shè)計(jì)的關(guān)鍵,這部分對(duì)紅外的光學(xué)器件進(jìn)行了分析,在此基礎(chǔ)上選出了適合紅外語(yǔ)音通信系統(tǒng)設(shè)計(jì)的器件。再次,從紅外無(wú)線(xiàn)通信的強(qiáng)度檢測(cè)/直接接收系統(tǒng)(IM/DD)模型得出衡量紅外無(wú)線(xiàn)通信信道的性能指標(biāo):系統(tǒng)脈沖響應(yīng)。結(jié)合紅外光輻射理論,對(duì)紅外無(wú)線(xiàn)通信發(fā)射器、接收器傳輸功率和通信信道進(jìn)行研究,建立紅外通信信道的數(shù)學(xué)模型,從理論上詳細(xì)介紹了系統(tǒng)的脈沖響應(yīng)計(jì)算方法,并利用matlab實(shí)現(xiàn)對(duì)脈沖響應(yīng)進(jìn)行仿真,通過(guò)改變仿真參數(shù)分析紅外無(wú)線(xiàn)傳輸中的各項(xiàng)指標(biāo)對(duì)系統(tǒng)性能的影響,研究結(jié)果表明:紅外發(fā)射器發(fā)出的紅外光脈沖經(jīng)過(guò)反射后到達(dá)接收器會(huì)產(chǎn)生多徑效應(yīng),脈沖響應(yīng)隨著反射次數(shù)的增加呈下降趨勢(shì)。但在室內(nèi)傳輸過(guò)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(shè)備,提高紅外語(yǔ)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(shè)計(jì)入手,完成紅外語(yǔ)音通信系統(tǒng)各個(gè)功能模塊的設(shè)計(jì)。闡述了紅外語(yǔ)音通信系統(tǒng)進(jìn)行脈沖調(diào)制的必要性,給出了幾種常用的脈沖調(diào)制方式的概念,結(jié)合傳統(tǒng)紅外語(yǔ)音通信的設(shè)計(jì)經(jīng)驗(yàn),選用PWM調(diào)制作為紅外語(yǔ)音通信系統(tǒng)的調(diào)制方式。根據(jù)D類(lèi)音頻放大器的基本原理和采樣定理等相關(guān)理論,確定了紅外語(yǔ)音系統(tǒng)的各個(gè)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(lái)增加紅外語(yǔ)音通信系統(tǒng)的傳輸距離,最終完成了紅外語(yǔ)音通信系統(tǒng)的設(shè)計(jì)。本文的重點(diǎn)在第四章紅外語(yǔ)音通信系統(tǒng)的設(shè)計(jì)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(xué)位授予單位】：延安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TN929.1

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本文編號(hào)：2332483