ICS数字直放站是直放站系统发展的热点领域和重要方向。这里介绍了基于LMS算法的干扰抵消系统的基本原理,根据软件无线电基本理论给出了系统的硬件具体实现,基于FPGA平台描述了系统各软件模块的实现方法,测试结果表明干扰抵消比高达30 dB,通道时延小于8 ns。该系统通用性和扩展性强,可以移植到各种同频干扰抵消系统中。 ICS digital repeater is a hot area and an important direction for the development of repeater system. The basic principle of interference cancellation system based on LMS algorithm is introduced here. The hardware realization of the system is given based on the basic theory of software radio. The realization of each software module is described based on FPGA platform. The test results show that the interference cancellation ratio is as high as 30 dB , The channel delay is less than 8 ns. The system is universal and scalable and can be ported to a variety of co-channel interference cancellation systems.