基于IIR抗混叠干扰滤波器的相干跳频同步技术研究

Research on Coherent Frequency Hopping Synchronization Technology Based onIIR Anti-aliasing Filter

摘要:

无线通信波形设计中,扩频通信是常用的抗干扰设计体制。其中,相干跳频波形因为具有更好的抗干扰性能而受到广泛研究,相干跳频波形的抗干扰性能也与抗干扰滤波器的性能成正相关。受限于传统的FPGA资源和AD采样率,相干跳频波形研究方法是结合射频前端多频点下变频+软件无线电平台窄带同步的设计与实现架构,本文采取射频前端全带宽采样+软件无线电平台宽带同步的设计与实现架构。抗干扰滤波器通常设计基于FIR的低通滤波器结构,但是相比于IIR滤波器,其资源占用高。本文提出基于IIR的低通滤波器结构和作为抗干扰滤波器,采用相位非线性补偿,确保施加不同干扰情况下相干跳频波形的抗干扰性能保持不变。

Abstract:

In wireless communication waveform design, spread spectrum communication is a commonly used anti-jamming design system. Among them, the coherent frequency hopping waveform has been widely studied because of its better anti-interference performance, and the anti-interference performance of the coherent frequency hopping waveform is also positively correlated with the performance of the anti-interference filter. Limited by the traditional FPGA resources and AD sampling rate, the research method of coherent frequency hopping waveform is to combine the design and implementation architecture of RF front-end multi-frequency down-conversion + software radio platform narrowband synchronization. This article adopts RF front-end full-bandwidth sampling + software radio platform The design and implementation architecture of broadband synchronization. The anti-interference filter is usually designed based on the FIR low-pass filter structure, but compared to the IIR filter, its resource occupancy is high. This paper proposes a low-pass filter structure based on IIR and as an anti-jamming filter, using phase nonlinear compensation to ensure that the anti-jamming performance of the coherent frequency hopping waveform remains unchanged under different interference conditions.