基于DSP和FPGA的嵌入式数字直接序列扩频系统的研制  

Design of an Embedded Digital DSSS System Based on DSP and FPGA

作　　者：王甲池[1] 江太辉[1] 

机构地区：[1]五邑大学信息学院,广东江门529020

出　　处：《电讯技术》2003年第6期99-103,共5页Telecommunication Engineering

摘　　要：介绍了一种基于Xilinx公司的FPGA(Spartan2XC2S200)和TI公司的DSPTMS320VC5410设计的直接序列扩频收发机,其下变频后的部分,如PN码的捕获、跟踪、基带解调(去掉剩余频差)等全部采用FPGA数字实现。对PN码的捕获,采取了一种门限自适应控制的双积分滑动相关捕获方法,既大大节省了FPGA的硬件设计资源,又能使PN码的平均捕获时间足够小。经实验测试,该系统各参数完全达到设计要求。A digital DSSS system is introduced ,which is designed with FPGA Spartan2 XC2S200 of Xilinx company and DSP TMS320VC5410 of TI company. The designs of acquisition,tracking and baseband demodulation after downconvertion to baseband are based on FPGA. For acquisition,the authors present a method of double dwells serial-search DS acquisition with adaptive threshold. It not only saves much hardware resource, but also can have a short period of acquisition. This system has already passed all tests.

关 键 词：DSP FPGA 数字直接序列扩频 接收机 自适应门限 双积分滑动相关捕获 平均捕获时间 

分 类 号：TN914.42[电子电信—通信与信息系统] TN85[电子电信—信息与通信工程]