communication technology

Recently,with the development of communication technology, there are three main technical standards such as CDMA2000, WCDMA and TD-SCDMA for the third generation mobile communication systems by which people can get a very high quality and convenient service in their daily life. However, because of the complexity of mobile communication system, it is difficult for people to grasp the various technical standards in the protocol.Faced with the arrival of the information age, people enjoy the pleasure of the information society at the same time, also encountered a new challenge.It is very necessary to learn and master the CDMA mobile communication technology for the vast numbers of engineers and college students.This paper is based on a lot of literatures and relative design schemes. According to the principle of CDMA2000, a CDMA2000 baseband signal processing module based on DSP has been designed mainly for the library of high school and other related institute. The union of DSP and CPLD is the main controller system, and the CDMA2000 channel physical layer protocol is the theoretical basis,and the experiments are carried out in accordance with the design of signal processing flow. The design and development of most part of basic experiment of baseband signal processing in CDMA2000 physical layer channel can be completed on the module. This experimental system is made up of two parts, hardware and software. The hardware includes power supply module, DSP central processing unit module, CPLD module, AD module, DA module, Flash module and so on. And the software includes CRC coding, convolutional coding, block interleaving, Walsh coding, long code spreading spectrum, short code scrambling and QPSK modulation and so on.This experimental module has been put into use now. Compared with other communication experimental platforms, the versatility and openness have been enhanced.There is no need for the user to change the hardware circuit, the research of algorithm and the expansion of the experiment will be able to achieve as long as by modifying the software.The operation is simple and convenient.
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mobile communications

With the coverage and the growing popularity of mobile communications, the base stations distribute all over the country. With the equipment and the increasing number of functions, base stations faced with new demand. Therefore, the development of a unified management system, with electricity management, base station monitoring, anti-theft features, which reach to strengthen chi hair straightener management and improve the efficiency of the management has become the future development direction of the base station management.This paper came from the practical application of engineering, designed a base station information integrated management system based on GPRS. The system is divided into information terminals and servers, information terminal is constituted by terminal host, custom digital ammeter, anti-theft camera and a number of other functional modules. It is installed in chi straightener the base station itself and responsible for data collection, delivery and related control. The server placed in the data center to complete the preservation, analysis, query, display of data and associated control. This paper completed the design and implementation of the information terminal.The terminal chi flat iron host using ST's high-performance ARM7 processor as the core to manage custom digital ammeter, anti-theft camera and data transmission.The terminal host hardware and software architecture design are described in detail in this paper. For the base station’s power and environmental monitoring needs, design a custom digital meter, the meter use MSP430 as the core, this paper gives the detailed design of meter hardware design and polo shirts program flow. Demand for base stations anti-theft designed security cameras, the cameras used men's nike shoes Vimicro VC0706 as the master chip, combined with the infrared sensor, to achieve the function of the photograph when someone broke into, the pictures are marked with time label and forwarded to the terminal host. The whole system achieved electricity management, power and environmental monitoring and base station anti-theft functions.Finally, the communication reliability of the system and the various functions of the customize meter are tested. Test data show that the function of the system meet the design objectives.
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