Design of DSFH Hybrid Spread Spectrum System Based on FPGA 基于FPGA的DSFH混合扩频系统设计.pdfVIP

Design of DS/FH Hybrid Spread Spectrum System Based on FPGA Longjun Liu, Hongwei Ding(), Qianlin Liu, Weifeng Zhang, and Zhenggang Liu School of Information, Yunnan University, Kunming 650500, Yunnan, China {893817028,767950080,641846684}@, dhw1964@163.com, liuqianlin@ Abstract. Anti-interference ability is an important index to evaluate the physical fitness of communication system. Compared with general wireless communication systems, the DS/FH Hybrid spread spectrum system has high security and strong ability of anti-interception. This paper presents a design of DS/TH hybrid spread spectrum system based on FPGA. In the design, direct spread spectrum and frequency hopping spread spectrum of the input data is modulated by the spreading code. In the receiver, the pseudo random sequence is used to despread spread spectrum signal after capturing the sync signal. The simulation of the system is implemented by the combination of the hardware circuit description language Verilog HDL and the principle diagram on Quar- tus II software in the design. Keywords: DS/FH Spreading codes Modulation Demodulation FPGA 1 Introduction With many excellent characteristics, spread spectrum communication system develops rapidly in the fields of communication, navigation, measurement and other fields. Especially, it has strong anti-interference and anti-interception ability, which makes the spread spectrum communication widely used in military and mobile communication. The direct spread system and frequency hopping system are the most widely used in these two fields. In general, frequency hopping system is mainly used