Channel Allocation Scheme Based on NSGA-II for Frequency-Division-Multiplexing UHF RFID System

With the proposal and development of the internet of things (IoT), the ultra-high frequency (UHF) passive radio frequency identification (RFID) system based on backscatter communication technology has become one of the core technologies of the IoT due to its advantages of low power consumption and low cost. However, the insufficiency of the system throughput has become the primary problem restricting the implementation of ubiquitous connectivity. Frequency division multiplexing (FDM) UHF passive RFID is an effective method to improve the system throughput, and the quality of RFID terminal sub-carrier channel allocation is the key. This paper adopts the multi-objective Pareto optimization rule to establish the channel allocation model of FDM UHF passive RFID system based on the harmonic interference power and spectrum utilization, and uses the improved NSGA-II optimization algorithm to iteratively obtain the Pareto solution set of the system model. The simulation results show that in the setting channel capacity interval, a set of channel allocation configuration are provided respectively, and the channel allocation method proposed in this paper improves the system spectrum utilization by 42.95% and 82.81% under the two different distribution conditions of tags respectively, and achieves the maximum spectrum utilization of 62%.