无源RFID电子标签反向链路编码方法的改进

The Improvement of Return-link Coding Method for Passive RFID Tag

在无源RFID系统中,降低无源电子标签的能耗,通常是提高通信质量与通信可靠性的一种有效的手段和方法.对FM0编码方法进行改进,通过在一个码元周期内采用非对称的高低电平持续时间,提高低电平占空比,使高电平持续时间缩短,从而使得发送一个码元的能耗降低,由此降低整个射频通信的能耗.分析表明,在电子标签获取的能量一定的条件下,改进的编码方法在发送数据"0"码元时比FM0编码消耗更少能量,并且通过理论分析得知,改进的编码方法并没有增加误码率.因此,改进的FM0编码对降低无源电子标签的能耗是有益的.

In Passive RFID system,reduce the energy consumption of the passive electronic is usually a kind of effective means and methods to improve the communication quality and reliability. I improved the FM0 coding method by use a non-symmetrical of high and low level last time in one element cycle. In this way, it can improve the low electricity level duty cycle and reduced the duration of high electricity level. So, it is reduce the energy consumption of sending a code element and thus reduce the energy consumption of the whole radio frequency communication. The Analysis showed that in the conditions of the electronic tag contains a certain energy, the improved encoding method consumes less energy than the FM0 code when send the ＂0＂ code element. And through the theoretical analysis, we know that the improved FM0 coding method does not increase the bit error rate. So,the improved FM0 coding method is helpful to reduce the energy consumption of the passive electronic tags.