CAJ | 학술논문

针对航空通信背景，建立了航空数据链复合衰落信道模型，并提出了一种基于谐波叠加思想且易于FPGA硬件实现的定点模型。该模型利用不同谐波叠加产生高斯随机过程，并通过非线性变换分别获得Nakagami衰落和对数正态分布衰落。最后，通过数值仿真选取合适的定点参数，并利用Xilinx公司的FPGA芯片进行编程实现。实测结果表明，该硬件模拟器的输出衰落统计特性与理论值吻合，可用于实际航空数据链系统的模拟测试。
침대항공통신배경，건립료항공수거련복합쇠락신도모형，병제출료일충기우해파첩가사상차역우FPGA경건실현적정점모형。해모형이용불동해파첩가산생고사수궤과정，병통과비선성변환분별획득Nakagami쇠락화대수정태분포쇠락。최후，통과수치방진선취합괄적정점삼수，병이용Xilinx공사적FPGA심편진행편정실현。실측결과표명，해경건모의기적수출쇠락통계특성여이론치문합，가용우실제항공수거련계통적모의측시。
Considering the aeronautical communication scenario, a new composite fading channel model for the aerospace data link system is established in this paper.And on this basis, a fixed-point realizable model based on Sum-of-Sinusoids (SoS) method is proposed which is easy to be achieved by FPGA.It generates Gaussian random processes using different SoS models and then obtains the Nakaga-mi fading process and lognormal fading process through some nonlinear transformations.Finally, the suitable fixed-point parameters are selected by numerical simulation and implemented based on FPGA produced by Xilinx.The experimental results show that the statistical characteristics of this channel em-ulator are consistent with the theoretical value, and it can be used for the test of aerospace data link sys-tem.