基于声波的近距离无线通信系统研究与设计
发布时间:2018-08-21 07:55
【摘要】:随着移动互联网的迅猛发展,移动设备对近距离互联的需求使得近距离无线通信技术找到了合适的应用平台。近距离无线通信技术与传统有线通信技术在数据传输上相比较,不但具有实现成本低、使用方便等优点,而且还摆脱了有线通信布线的困扰。本文介绍了一种基于声波的近距离无线通信系统,其主要包括声波通信系统的方案选择及系统软硬件平台设计与实现。 论文主要做了以下几方面工作:首先,论文对声波通信信道进行研究,其中主要包括声波在空气信道传输过程中的衰减特性,以及声波传输的多径效应和多普勒频率偏移对通信系统的影响。其次,介绍了声波通信系统运用到的相关技术和系统方案选定,重点讨论了通信系统中的信道编码理论,信号调制解调原理和频谱细化技术,并确定了系统信道编码方案采用RS编码,信号调制方案采用基于DDS的FSK软件调制方法,信号解调方案采用基于频谱估计理论的FFT解调方法及硬件平台采用基于Cortex-M4内核的STM32F407VGT6处理器。然后,介绍了系统发送端和接收端软硬件模块的设计过程,发送端硬件部分主要包括电源电路、电压放大器、模拟滤波器和功率放大器,接收端硬件部分主要包括声波接收换能器匹配电路、低噪电压放大器和自动增益控制电路,发送端软件部分主要介绍了码元发送程序、RS编码算法和MFSK调制算法,接收端软件部分主要包括AGC算法、信号同步检测算法、MFSK解调算法和RS译码算法。最后,分别对系统发射端和接收端进行了测试,并实验分析了通信速率、通信距离和误码率的关系。对本文提出的声波通信系统测试结果表明,系统的硬件电路和软件算法设计合理,基本满足相关理论研究结果。
[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.
【学位授予单位】:太原理工大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:TN92
本文编号:2195056
[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.
【学位授予单位】:太原理工大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:TN92
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