Research And Implementation Of Audio Transmission Technology Based On Power Line Communication

With the development of society,people's dependence on information is more and more strong,which has brought a broad development space for the development of information technology.Power line communication system is a kind of communication mode which uses power line transmission information.It has many outstanding advantages,such as multi users,wide distribution and no need to re-wiring.It can be used as an effective way to realize the communication.It also provides a chance for the national network development and the Internet of things.This research is based on the power line communication of the audio transmission system,the system mainly uses Speex speech codec algorithm which can provide high quality and low bit rate of voice encoding.And in many master control chips the STM32F103xx series microcontroller is chosen because of ultra low power consumption and excellent performance,to provide a stable and efficient processor.The application research of this topic has the positive function to promote and realize the product transformation of the low voltage PLC technology.In power line communication,the modulation technology is orthogonal frequency division multiplexing(OFDM)technology,and the traditional OFDM is based on Fourier transform.A new OFDM system based on wavelet transform instead of Fourier transform is proposed to expect that the transmission of power line channel has a good improvement.Therefore,this paper mainly researched from two aspects.Firstly,based on the platform of power line communication and combining with the characteristics of hardware and software design,a set of audio transmission system was designed and implemented.The Speex encoding and decoding algorithm was applied to this system,which had positive significance for the development of power line.After that,the OFDM technology based on wavelet transform was studied,which had great advantages and potential in improving the performance of communication system.Through simulation and comparison analysis,the OFDM based on wavelet transform was better than the traditional OFDM performance.It is expected to improve the performance of power line communication system in power line communication.