Research On Performance Simulation Of CD-RFID

With people's increasing demand for communication technology,the application of RFID technique is is bound to spread in future life.Currently RFID technology can meet the tag identification application at short distances at low frequencies,taking single-channel access.However,in the bulk logistics,personnel-intensive case,the distance is longer,the number of label is bigger,the noise of environment is more,so you need to try to improve the speed and accuracy of the individual identification tag RFID reader to mature applications.While the current spectral bandwith is much higher than the required bandwith to identify individual pins,and the way of single channel dicreased the spectral channel utilization.How to improve the spectrum utilization and enhances the interference immunity of RFID system has great research value.And the main technology of the third generation communication system,CDMA,has spread spectrum communication,makes it has a good advantages of interference immunity.Spread spectrum technology also has advantages of improving the utilization of radio spectrum.Therefore,this topic will be designed to combine CDMA technology and RFID technology to solve the problem,and make the performance analysis based on CD-RFID anti-collision protocol systems as the research direction.This paper summarizes the characteristics and advantages of RFID technology,ISO/IDE18000-6C standard and CDMA technology in terms of interference,and analyzes the slot class ALOHA anti collision algorithm,clears and definites the relation between spread spectrum code length and error bit rate.proposes multi-channel frame slots algorithm.The CDMA used in RFID systems can be seen as having a multi-channel system,each channel still exists collision.each tab select one channel,the tag anti-collision algorithm within the same channel is still using slotted ALOHA-class algorithm.By using spread spectrum communication,enhances the interference immunity of RFID system,expands recognition distance of the label.By using the anti-multiple access interference capacity of CDMA and fast processing capabilities of multicore chips,achieves the high identification label rate simultaneously in multiple channels.Simulation the performance of CD-RFID system in Microsoft Visual C++ 2010 x32 environment.Got the comparison between the CD-RFID and existing ISO/IDE18000-6C standards,especially the relationship between tag identification rate and the number of channels.The results of the simulation data showed that the rate of CD-RFID tag identification system significantly improved,and the advantages of using multi-channel frame slot algorithm CD-RFID system in tag identification rate.The CD-RFID system performance of this study,ignoring the situation tag information is sent to the reader that could go wrong,is an ideal simulation under noise conditions.