RFID多读写器自适应加权功率分配算法

An Adaptive Weighted Power Allocation Algorithm for RFID Multiple Readers System

针对多读写器应用环境中的干扰问题,该文给出了基于误包率的信噪比估计式,分析了估计式的统计性能,提出了一种可自适应调节权重因子的比例公平功率分配算法。该算法使处于高密度区域的读写器能够自动增大权重因子,从而保证了工作区域内处于不同位置的读写器均能将读写质量维持在标称值附近。该文将分布式算法用于功率分配的具体实现,并证明了算法迭代值可收敛于某个局部最优解。仿真结果表明,算法在公平性方面要优于现有的功率分配方案,且具有良好的收敛性能。

A SNR estimator based on packet error ratio is proposed,and its statistical property is analyzed for the interference problem in multiple readers environment. An adaptive weighted proportion fairness power allocation algorithm is proposed which can increase the weight of readers in high density area automatically to ensure the read performance for readers in different position. A distributed algorithm is applied to power allocation and its convergence to a local solution is proved. The simulation results show that,the fairness and convergence of the proposed algorithm are superior to the existed allocation scheme.