The Design Of Short Distance Wireless Data Transmission System

Wireless Data Transmission is based on Wire Data Transmission, use the Radio Frequency Technology achieve Wireless Data Transmission,provides a fast and convenient way to being-wirelessed, mobilingzation, digitization of the Data Transmission, become an effective means and widely used technique for Data Transmission.Nowadays, the transmission distance of Wireless Data Transmission can reach ten to hundred meters, in terms of the cost, property, applications, power consumption of the product, it have a high application value and broad prospects, but the product of Wireless Data Transmission have the weakness of high cost, short transmission distance, unstable property and weak anti-interference capability, how to achieve low cost, high property and far transmission distance of the Wireless Data Transmission systems is a challenging and meaningful work.This paper plans to resolve the problem of short transmission distance, high cost, and unstable property of today’s Data Transmission, come up with a scheme that based on μC/OS-III Operating System, use processor STM32based on ARM Cortex-M3Structure, using DPMR communication protocol that used for Digital Interphone, to achieve short distance wireless data transmission.Firstly, we discuss the working principle of Wireless Data Transmission, designed the general structure block diagram for Wireless Data Transmission System, and described the design of hardware circuit, including the design of Control Circuit, RF Receive and Send Circuit, Power Amplifier Circuit, and the Switch of RF Receive and Send Circuit.Secondly, the paper described the design of software, come up with a general structure block diagram of the software design, introduced the μC/OS-III Operating System and DPMR protocol, and used Layered Design for Software System, detailing introduced the design of AT instruction in Application Layer, control protocol,serial receive and send processing and RF transceiver processing in Middle Layer, and the drive design of RF transceiver CC1125in Bottom Layer.Finally, transplanted the μC/OS-III Operating System into the hardware platform of Data Transmission module, and test the system,the device performance has met the requirements of expectant technical targets, achieved a1W transmit power,-60dBm Adjacent Channel Rejection, lkm Communication Distance and high performance for Short Distance Wireless Data Transmission System.