量化误差对多天线无人机通信系统性能的影响与分析

Performance Analysis of Multi-Antenna UAV Communication System with Quantization Error

无人机(Unmanned aerial vehicle, UAV)通信由于具有通信容量大、机动性高、信号配置灵活等优点,在应急通信等领域受到了国内外学者的青睐。基于此背景,该文研究了无人机相控阵天线中数字移相器的量化误差以及信道衰落特性对通信系统性能的影响。该文首先考虑了地面用户到UAV的上行链路,并假设信道衰落特性服从Nakgami-m分布,根据大数定理推导出了考虑量化误差时的等价信噪比,从而进一步推导出系统中断概率(Outage probability, OP)和平均误码率(Average sign error rate, ASER)的闭合表达式。最后通过Monte Carlo仿真验证了闭合表达式的正确性,并进一步分析了典型参数对系统性能的影响。

Unmanned Aerial Vehicle(UAV)has been favored by scholars at home and abroad in the field of emergency communication due to its advantages such as large communication capacity,high mobility,and flexible signal configuration in this paper,the quantization error of digital phase shifter in UAV phased array antenna and the influence of channel fading characteristics on the communication system performance are studied.The channel is modeled as the uplinks between ground user and UAV,and the channel fading characteristics obey Nakagami-m distribution.Based on the theorem of large Numbers,the equivalent SNR of system considering quantization error is derived,and then the closed expressions of system interrupt probability and average bit error rate are derived.Finally,the theoretical analysis of the closure expression is verified by computer Monte Carlo simulation,and the influence of typical parameters on system performance is analyzed.