关键词: 扩频信号源, 现场可编程门阵列, Nios II系统, 自定义组件, 可编程片上系统

Abstract: Spread spectrum signal generator is an important component of spread spectrum system，it can provide various forms of spread spectrum signal for the receiver（such as DS，FH，etc）.Currently with the high price of the spread spectrum signal generator on sale，and the poor expansibility and upgradeability of using ASICs.A cost-effective spread spectrum signal generator with high flexibility based on the Nios II soft-core processor is introduced in this paper.The technology of custom component in Nios II and the principle of spread spectrum signal generator are combined together，and a custom component which can produce spread spectrum signals in a Nios II system is designed.This component has a variety of control parameters and two optional way of modulation：frequency-hopping modulation and direct spread spectrum modulation.By using the SOPC technology，it can generate various spread spectrum signals after adding the custom component to Nios II system and calling related driver software to the top level.

Key words: spread spectrum signal generator, Field Programmable Gate Array（FPGA）, Nios II, custom component, System on a Programmable Chip（SOPC）