【摘要】：隨著移動互聯(lián)網(wǎng)的迅猛發(fā)展,移動設(shè)備對近距離互聯(lián)的需求使得近距離無線通信技術(shù)找到了合適的應(yīng)用平臺。近距離無線通信技術(shù)與傳統(tǒng)有線通信技術(shù)在數(shù)據(jù)傳輸上相比較,不但具有實現(xiàn)成本低、使用方便等優(yōu)點,而且還擺脫了有線通信布線的困擾。本文介紹了一種基于聲波的近距離無線通信系統(tǒng),其主要包括聲波通信系統(tǒng)的方案選擇及系統(tǒng)軟硬件平臺設(shè)計與實現(xiàn)。 論文主要做了以下幾方面工作：首先,論文對聲波通信信道進(jìn)行研究,其中主要包括聲波在空氣信道傳輸過程中的衰減特性,以及聲波傳輸?shù)亩鄰叫?yīng)和多普勒頻率偏移對通信系統(tǒng)的影響。其次,介紹了聲波通信系統(tǒng)運(yùn)用到的相關(guān)技術(shù)和系統(tǒng)方案選定,重點討論了通信系統(tǒng)中的信道編碼理論,信號調(diào)制解調(diào)原理和頻譜細(xì)化技術(shù),并確定了系統(tǒng)信道編碼方案采用RS編碼,信號調(diào)制方案采用基于DDS的FSK軟件調(diào)制方法,信號解調(diào)方案采用基于頻譜估計理論的FFT解調(diào)方法及硬件平臺采用基于Cortex-M4內(nèi)核的STM32F407VGT6處理器。然后,介紹了系統(tǒng)發(fā)送端和接收端軟硬件模塊的設(shè)計過程,發(fā)送端硬件部分主要包括電源電路、電壓放大器、模擬濾波器和功率放大器,接收端硬件部分主要包括聲波接收換能器匹配電路、低噪電壓放大器和自動增益控制電路,發(fā)送端軟件部分主要介紹了碼元發(fā)送程序、RS編碼算法和MFSK調(diào)制算法,接收端軟件部分主要包括AGC算法、信號同步檢測算法、MFSK解調(diào)算法和RS譯碼算法。最后,分別對系統(tǒng)發(fā)射端和接收端進(jìn)行了測試,并實驗分析了通信速率、通信距離和誤碼率的關(guān)系。對本文提出的聲波通信系統(tǒng)測試結(jié)果表明,系統(tǒng)的硬件電路和軟件算法設(shè)計合理,基本滿足相關(guān)理論研究結(jié)果。
[Abstract]:With the rapid development of mobile Internet, the demand of mobile devices for close-range interconnection makes the close-range wireless communication technology find a suitable application platform. Compared with the traditional wired communication technology, the close-range wireless communication technology not only has the advantages of low cost and convenient use, but also gets rid of the problem of wired communication cabling. This paper introduces a close range wireless communication system based on acoustic wave. It mainly includes the scheme selection of acoustic communication system and the design and implementation of software and hardware platform of the system. The main work of this paper is as follows: firstly, the acoustic communication channel is studied, which includes the attenuation characteristics of acoustic wave in the air channel transmission process. The multipath effect of acoustic wave transmission and the influence of Doppler frequency offset on the communication system are also discussed. Secondly, the paper introduces the relevant technologies and system schemes used in acoustic communication system, and discusses the channel coding theory, signal modulation and demodulation principle and spectrum thinning technology in the communication system. It is determined that the system channel coding scheme adopts RS coding, and the signal modulation scheme adopts FSK software modulation method based on DDS. The signal demodulation scheme adopts FFT demodulation method based on spectrum estimation theory, and the hardware platform adopts STM32F407VGT6 processor based on Cortex-M4 kernel. Then, the design process of the software and hardware modules at the transmitter and receiver is introduced. The hardware of the transmitter includes power supply circuit, voltage amplifier, analog filter and power amplifier. The hardware of the receiver mainly includes the matching circuit of the acoustic wave receiver transducer, the low noise voltage amplifier and the automatic gain control circuit. The software part of the transmitter mainly introduces the code sending program RS coding algorithm and the MFSK modulation algorithm. The receiver software mainly includes AGC algorithm, signal synchronization detection algorithm, MFSK demodulation algorithm and RS decoding algorithm. Finally, the system transmitter and receiver are tested, and the relationship among communication rate, communication distance and bit error rate is analyzed experimentally. The test results of the acoustic communication system presented in this paper show that the hardware circuit and software algorithm of the system are reasonable and basically meet the relevant theoretical research results.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN92

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本文編號：2195056