中文摘要：

设计并实现了一种基于室内LED照明光源的位置服务系统。系统利用LED标签（LED—ID）技术，LED提供照明的同时广播自身的位置ID信息，移动终端将接收到的ID信息与位置关联，实现自身的被动定位。可见光通信的调制编码以及解调解码模块均采用单片机处理器（PC）实现，并提供UART接口分别与PC控制端和手机显示端进行通信。PC控制端向LED信号源发送位置服务信息，LED信号源通过空间光传输方式将自身位置ID和接收到的位置服务信息广播出去。手机使用终端加载有Android操作环境下的室内定位导航软件，可以实时更新位置和位置服务信息。

英文摘要：

This paper designs and realizes a location-based services system using indoor LED sources. This system applies LED identification （LED-ID） technology. The LED source transmits a unique ID code, which the receiver associates with geographic position to achieve its current location. The modulation and coding of the transmitter, as well as the demodulation and decoding of the receiver, are all realized by the single-chip processor which also provides UART interface to communicate with PC controller and mobile phone displayer. The PC controller sends location-based service messages to LED signal source,and then the source broadeasts its ID and the received message through space optical transmission. The mobile terminal installs an Android indoor positioning and navigation software which updates users＇ location and extra location service information in real time.