發(fā)布時間：2018-05-16 17:00

  本文選題：脈沖位置調(diào)制 + FPGA　； 參考：《青島科技大學(xué)》2017年碩士論文

【摘要】：隨著人們對海洋資源的深入開發(fā),人類與海洋的通信日益頻繁,迫切需要高速水下無線通信技術(shù)的支持。目前水下聲通信雖然是水下無線通信的主要方式,但是由于水聲帶寬的限制,水聲通信無法實(shí)現(xiàn)傳輸速率的有效提升。另外,由于水下電磁波的嚴(yán)重衰減,水下電磁波通信也無法實(shí)現(xiàn)高速水下通信。450~550nm波段的藍(lán)綠光在水中的衰減比其他光波段小很多,這為水下光通信的發(fā)展奠定了基礎(chǔ)。而且水下光通信系統(tǒng)具有傳輸帶寬大、數(shù)據(jù)傳輸效率高和通信設(shè)備體積小等優(yōu)點(diǎn),可解決水下高速無線傳輸難題。然而由于水下信道傳輸環(huán)境復(fù)雜,水下光通信發(fā)展緩慢,直至近年來更高編碼方式、大功率發(fā)光光源和高處理速率芯片的出現(xiàn),使得水下光通信成為研究熱點(diǎn)。本文采用藍(lán)光光源,設(shè)計并實(shí)現(xiàn)了一種基于脈沖位置調(diào)制(Pulse Position Modulation,簡稱PPM)的水下高速光通信系統(tǒng),該系統(tǒng)采用通信接口接收上位機(jī)軟件發(fā)送的數(shù)據(jù)信息,下位機(jī)采用現(xiàn)場可編程門陣列(Field-Programmable Gate Array,簡稱FPGA)開發(fā)平臺進(jìn)行PPM的調(diào)制和解調(diào)處理。論文主要完成以下方面的工作:首先,系統(tǒng)硬件的設(shè)計:主要完成了發(fā)送端光源驅(qū)動電路、光接收器電路、外部信號處理電路等硬件電路的設(shè)計,包括對應(yīng)器件的功能分析和選擇。并通過信號檢測完成了硬件電路設(shè)計的可行性和效率檢測。其次,基于QuartusII11.0開發(fā)軟件采用硬件描述語言進(jìn)行軟件部分的設(shè)計。主要完成了數(shù)據(jù)信號的接收,以及對數(shù)據(jù)進(jìn)行PPM調(diào)制和解調(diào)處理的編碼設(shè)計。通過對PPM調(diào)制和解調(diào)中各功能子模塊的分開設(shè)計,實(shí)現(xiàn)了數(shù)據(jù)的綜合處理功能,并通過波形仿真軟件進(jìn)行模擬仿真。同時,各功能子模塊根據(jù)波形仿真結(jié)果驗(yàn)證各模塊設(shè)計的可行性。最后,對本文設(shè)計的水下光通信系統(tǒng)進(jìn)行實(shí)驗(yàn)結(jié)果的分析,進(jìn)一步驗(yàn)證了設(shè)計的可行性。實(shí)驗(yàn)表明,本文基于PPM調(diào)制所設(shè)計的水下可見光高速通信系統(tǒng)能夠在最低誤碼率要求的范圍內(nèi)實(shí)現(xiàn)Mbps的高速數(shù)據(jù)傳輸速率,可準(zhǔn)確、高效的完成水下信道的無線數(shù)據(jù)通信。
[Abstract]:With the development of ocean resources, the communication between human beings and the ocean is becoming more and more frequent, and the support of high-speed underwater wireless communication technology is urgently needed. At present underwater acoustic communication is the main way of underwater wireless communication, but due to the limitation of underwater acoustic bandwidth, underwater acoustic communication can not effectively improve the transmission rate. In addition, due to the serious attenuation of underwater electromagnetic wave, underwater electromagnetic wave communication can not achieve high-speed underwater communication. 450 nm blue green light attenuation in water is much smaller than other optical wave bands, which lays the foundation for the development of underwater optical communication. The underwater optical communication system has the advantages of large transmission bandwidth, high data transmission efficiency and small volume of communication equipment, which can solve the problem of underwater high-speed wireless transmission. However, due to the complexity of underwater channel transmission environment, the development of underwater optical communication is slow, until the emergence of high power light source and high processing rate chip in recent years, underwater optical communication has become a research hotspot. In this paper, a kind of underwater high-speed optical communication system based on pulse Position modulation (PPM) is designed and implemented by using blue light source. The communication interface is used to receive the data sent by the host computer software. The field programmable gate array Field-Programmable Gate Array (FPGA) is used to modulate and demodulate the PPM. The main work of this paper is as follows: firstly, the hardware design of the system: the design of the transmitter light source driving circuit, the optical receiver circuit, the external signal processing circuit and other hardware circuits, etc. Including the functional analysis and selection of the corresponding device. The feasibility and efficiency of hardware circuit design are tested by signal detection. Secondly, the hardware description language is used to design the software based on QuartusII11.0. It mainly completes the data signal receiving and the coding design of PPM modulation and demodulation. Through the separate design of each function sub-module in PPM modulation and demodulation, the comprehensive processing function of data is realized, and the simulation is carried out by waveform simulation software. At the same time, the functional sub-modules verify the feasibility of each module design according to the waveform simulation results. Finally, the experimental results of the underwater optical communication system designed in this paper are analyzed, and the feasibility of the design is further verified. The experiments show that the underwater visible light high-speed communication system designed based on PPM modulation can realize the high speed data transmission rate of Mbps within the minimum bit error rate, and can complete the wireless data communication of underwater channel accurately and efficiently.
【學(xué)位授予單位】：青島科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.3

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