现代电子技术
現代電子技術
현대전자기술
MODERN ELECTRONICS TECHNIQUE
2013年
15期
45-49
,共5页
Gardner%位同步%FPGA%Farrow
Gardner%位同步%FPGA%Farrow
Gardner%위동보%FPGA%Farrow
Gardner%bit synchronization%FPGA%Farrow
设计了一种基于 FPGA 的通用位同步器。该同步器采用改进后的 Gardner 算法结构，其中，内插滤波器采用系数实时计算的 Farrow 结构，定时误差检测采用独立于载波相位偏差的 GA?TED 算法，内部控制器和环路滤波器的参数可由外部控制器设置，因而可以适应较宽速率范围内的基带码元。阐述传统 Gardner 算法的原理，给出改进后的设计和 FPGA 实现方法，最后对结果进行仿真和分析，证明该方法的正确性。
設計瞭一種基于 FPGA 的通用位同步器。該同步器採用改進後的 Gardner 算法結構，其中，內插濾波器採用繫數實時計算的 Farrow 結構，定時誤差檢測採用獨立于載波相位偏差的 GA?TED 算法，內部控製器和環路濾波器的參數可由外部控製器設置，因而可以適應較寬速率範圍內的基帶碼元。闡述傳統 Gardner 算法的原理，給齣改進後的設計和 FPGA 實現方法，最後對結果進行倣真和分析，證明該方法的正確性。
설계료일충기우 FPGA 적통용위동보기。해동보기채용개진후적 Gardner 산법결구，기중，내삽려파기채용계수실시계산적 Farrow 결구，정시오차검측채용독립우재파상위편차적 GA?TED 산법，내부공제기화배로려파기적삼수가유외부공제기설치，인이가이괄응교관속솔범위내적기대마원。천술전통 Gardner 산법적원리，급출개진후적설계화 FPGA 실현방법，최후대결과진행방진화분석，증명해방법적정학성。
A universal bit synchronizer based on the Gardner algorithm is designed in this paper. The improved Gardner algorithm structure is adopted in the synchronizer to meet the requirements of the universal demodulator based on the software radio,which means that the bit synchronization could be achieved when the rate of baseband signals is changed in a wide range. In this paper,the principle of the traditional Gardner algorithm is introduced. The improved design and FPGA?based implementation methods are given. In particular,the interpolation filter coefficients can be computed in real time by Farrow structure,and GA?TED algorithm which is independent of the carrier phase error was used in timing error detection,while parameters of the loop filter and internal controller can be set up by the external controller. At last,the simulation and test results show that the method is correct.
