Research And Design Of Wireless Communication IC Card Entrance Guard System

IC card entrance guard system recently has become the most popular lock production depending on its peculiarities of security and redibility and flexibility and convenience . Now most entrance systems are based on wires that need lots of line-fixing work, and their net wires are easy to be destroied and are hard for people to find faults, and also be badly effected by lightning strike and overpressure.So how to realize the center computer to supervise each guard terminals by wireless net has become the study hotpot. And now there are two schemes can realize data to exchange by wireless: in china some developers worked out such system depending on GPRS/CDMA, and using the system needs fees. In overseas some develops a wireless device ,the module can add the door teminal unit, but it only used to extend more teminal based in the wire network, so this system are not independence wireless network.According to the system requirements were gived by HangZhou Bluehouse electronic limited company, we add wireless data-transfer module in order to existe offline entrance guard system and improve some technology to ensure its utility. This paper describes particular hardware and software designs and the center management software. In the other hand, we researched how to ensure the availability and dependability of the system communication. Such as ,we realized the hopping method in order to solve ISM frequency jam problem ,Presented relay- starriness router arithmetic to solve problem which the ISM frequency is hard to across the wall ; And used the CSMA/CA mechanism to make wireless data transmission more reliable.The experiments indicated that when we puted those optimize schemes which had mentioned before in practice the system performances improved.This system has low cost and low power dissipation and flexible network structure, so it is mostly applicable in intelligence reform of old area and office building and can make profit. This paper can supply references for the research and development of wireless network systems in the building.