The Application Research Of The CDMA Wireless Broadband In The Power Remote Measuring And Monitoring System

Remote data collection and transmission take important roles in the real-time communication system. Wireless communication is adopted by more and more remote data collection systems, because it is swift and convenient to construct the wirelss network.With the development of the communication technology and the users' higher requirements of the communication quality, the existing GSM network will evolve into W-CDMA unavoidably. During the process, CDMA will become an important resource in the informationization of such kind business deservedly, due to its virtues such as low cost, good performance and high security and reliability. Compared with GPRS, cdma 1x is more suitable for the power measuring and monitoring system on network resource, velocity and stability. It can support the extensive application of electric system strongly. Therefore, the data communication based on cdma lx becomes a better means of data transmission.Based on the study on the system realization principles, the realization methods and how to improve the system security, the wireless broadband communication system based on cdma lx has been designed and researched in this thesis.First, this thesis studies the principles of the packet data service of CDMA, analyzes the feasibility to realize the data service of CDMA network, the mechanism of connecting the communication system to the cdma lx network is also studied. This thesis studies the security of CDMA network and Internet, then proposes a mixed encryption scheme based on RSA and AES. Not only will the double encryption guarantee the reliability of data transmission, but also it will not aggravate the load of the system. In order to improve the security, this thesis has also studied the VPN technology, and has proposed the realization scheme. As the cdma lx network charges according to the flow, in order to decrease the cost, this thesis studies the data compression technology, and proposes the advanced LZ77 compression algorithm which reduces the flow effectively. Last, the software and hardware design and implementatin of the system is introduced in detail, and the system performance has been tested, and the result shows that it performs very well.