摘要
数字下变频(DDC)是软件无线电中的关键技术之一。通过DDC处理,大数据流中频信号变为低数据率的基带信号,以便于后续信号处理。以多通道GPS/BD-2阵列接收机项目为背景,提出了一种基于DDC ISL5416的数字下变频设计该系统采用方案8片ISL5416可同时实现多达32路的DDC处理。详细论述了利用ISL5416从宽带数字中频信号中提取窄带数字信号的高性能抽取滤波器的设计方法和要点。为解决软件无线电在实现中出现的硬件瓶颈提供了解决方案。
The Digital Down Conversion（DDC） plays a key role in Software Defined Radio（SDR）. The intermediate frcquency （IF） band signal with higher sample rate is converted into the baseband signal with lower sample rate by the processing of DDC in order to make easier for signal processing. This paper proposed a DDC design with the background of muhi-channel Array Receiver of GPS/BD-2, which could make the system realize 32 channel DDC processing with 8 chips of ISL5416. And the design methods of the Decimation filter which are used for extracting Narrow band digital signal from Broadband IF were discussed emphatically. The DDC provided the technical solution for solving the hardware bottleneck in software radio.
出处
《电子设计工程》
2010年第12期181-184,共4页
Electronic Design Engineering
