无线电工程
無線電工程
무선전공정
RADIO ENGINEERING OF CHINA
2011年
12期
61-64
,共4页
扩频码捕获%数字匹配滤波器%实现结构%资源消耗
擴頻碼捕穫%數字匹配濾波器%實現結構%資源消耗
확빈마포획%수자필배려파기%실현결구%자원소모
PN code acquisition%digital matched filter%implementation architecture%resource consumption
扩频码（伪随机码，PN码）捕获是扩频通信中扩频码同步的一个重要环节，基于匹配滤波器的捕获方法具有捕获时间短的优势，比较适合短码的捕获和实时通信的场合。为解决数字匹配滤波器资源占用多的问题，根据扩频码取值的双极性特性，针对数据过采样的应用场合，提出了一种基于FPGA实现的数字匹配滤波器的结构。该结构为两级滤波器形式，无乘法器单元，在一定程度上减少了滤波器的资源消耗同时并不增加系统的复杂度。
擴頻碼（偽隨機碼，PN碼）捕穫是擴頻通信中擴頻碼同步的一箇重要環節，基于匹配濾波器的捕穫方法具有捕穫時間短的優勢，比較適閤短碼的捕穫和實時通信的場閤。為解決數字匹配濾波器資源佔用多的問題，根據擴頻碼取值的雙極性特性，針對數據過採樣的應用場閤，提齣瞭一種基于FPGA實現的數字匹配濾波器的結構。該結構為兩級濾波器形式，無乘法器單元，在一定程度上減少瞭濾波器的資源消耗同時併不增加繫統的複雜度。
확빈마（위수궤마，PN마）포획시확빈통신중확빈마동보적일개중요배절，기우필배려파기적포획방법구유포획시간단적우세，비교괄합단마적포획화실시통신적장합。위해결수자필배려파기자원점용다적문제，근거확빈마취치적쌍겁성특성，침대수거과채양적응용장합，제출료일충기우FPGA실현적수자필배려파기적결구。해결구위량급려파기형식，무승법기단원，재일정정도상감소료려파기적자원소모동시병불증가계통적복잡도。
PN code acquisition is an important part of PN code synchronization in spread spectrum communication system, and the acquisition method based on matched filter is appropriate for short PN code acquisition because of its short acquisition time. In order to solve the problem that digital matched filter occupies too much device resources, the paper introduces an implementation architecture of matched filter based on FPGA, which is suitable for the application in which signal is over sampled. This architecture needs no multiplier unit and reduces the number of adders, meanwhile it doesn＇t increase the complexity of the system
