MIMO-OFDM應用于室內(nèi)可見光通信的技術研究
[Abstract]:White light LED light source for wireless information transmission has become a hot research topic in the field of wireless communication at home and abroad. Visible light communication (VLC) technology combines LED lighting with wireless communication, and the white light LED has short response time and can be modulated at high speed. With light as carrier, the technology of transmitting information by adjusting the bright intensity of white LED at high speed has the advantages of radiation safety, wide frequency band and the universality of LED. MIMO-OFDM will be the solution of indoor wireless high-speed communication. MIMO-OFDM can effectively resist multipath effect and suppress interference and noise by combining OFDM with space-time coding technology. It can greatly improve the transmission rate and channel capacity of wireless communication system, and achieve high-speed and reliable data transmission. In this paper, the orthogonality, modulation and demodulation between subcarriers of OFDM system, transmission error rate and so on are studied, and compared with single carrier transmission system in large scale fading. It is concluded that OFDM system can have ideal low bit error rate even in large scale fading. This paper analyzes the channel model of MIMO applied to indoor visible light communication, one is non-imaging wireless optical MIMO communication, the other is imaging MIMO communication, and it is concluded that imaging wireless optical MIMO communication is more suitable for practical application. Based on the analysis of the driving characteristics of white LED and the channel model of indoor visible light transmission, the application of MIMO-OFDM technology in indoor visible light communication system is proposed to realize high-speed and reliable information transmission. In this paper, the error rate of MIMO-OFDM modulation technology and MIMO modulation technology in different SNR is compared by simulation. In the case of the same transmission rate, the modulation technology of MIMO-OFDM in visible light communication shows a lower bit error rate. In the same symbol period, the information transmission rate is faster and the bit error rate is very low. At the detection end of MIMO signal, the error rate of ML detection algorithm, ZF detection algorithm and MMSE detection algorithm are compared and analyzed in different SNR cases. The maximum likelihood detection method shows a smaller bit error rate. Secondly, the minimum mean square error detection algorithm. However, the complexity of the maximum likelihood detection algorithm increases sharply with the increase of the number of transmit antennas and modulation order.
【學位授予單位】:西安電子科技大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TN929.1
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