短距离LED可见光音频传输系统设计  

Design of the short-distance transmission system based on LED visible light communication

作　　者：梁烈勇 

机构地区：[1]广西桂林市空管站技术保障部,广西桂林541004

出　　处：《电子技术应用》2012年第9期18-20,共3页Application of Electronic Technique

摘　　要：基于白光LED照明和通信双重作用,构建了一种短距离白光LED可见光音频传输系统。从短距离、低功率系统考虑,分析可见光传输模型和影响因素,设计可行的可见光发射端和接收端。采用AGC电路和限幅放大电路提高系统的动态范围,保证语音信息输出稳定;采用阵列接收方式扩大接收角,提高系统灵敏度。为了实现系统噪声匹配,设计了低噪声高增益前置放大器。测试结果表明,系统实现了可见光短距离音频信息的无失真传输,验证了系统的可行性。In the paper, a short-distance white LED visible light audio transmission system based on the dual role of white LED lighting and communication is proposed. Considering the system from short distance and low power angle, a feasible sender and receiver are designed. And the model and influencing factors of the visible light transmission are analyzed in the paper. The AGC circuit and limiting amplifier circuit are adopted to improve dynamic range and ensure voice information output stability. And the array of receivers are applied to expand the acceptance angl and improve system sensitivity in the system. In order to realize noisy matching, a low-noise and high-gain preamplifier is designed. The measurement results show that the proposed communication system is an error-free data transmission in line-of-sight atmospheric channel which verifies the feasibility of the system.

关 键 词：可见光通信 白光LED 噪声匹配 低噪声前置放大器 音频传输 

分 类 号：TN929.1[电子电信—通信与信息系统]