一种16倍采样的Gardner定时同步方法
|
摘要
DVB-S2X(The second generation Digital Video Broadcasting by Satellite Extensions)标准给出了高至256阶的APSK(Amplitude Phase Shift Keying)调制方式,对解调端的符号定时同步、帧同步和载波恢复都提出了更高的要求。结合DVB-S2X技术手册的建议,在经典的基于4倍符号速率采样的Gardner定时同步的基础上,提出了一种在定时同步环路前端加预滤波器并将原来的单路插值扩展到4路插值的基于16倍采样的同步方法。介绍了该方法的思想和结构并进行了仿真实验,结果表明该方法相比于经典Gardner方法有更好的误码性能,在高阶调制的情况下表现尤为突出。
The second generation digital video broadcasting by satellite extensions(DVB-S2 X) standard gives an amplitude phase shift keying(APSK) modulation mode high to 256 orders,which results in higher requirements for symbol timing synchronization,frame synchronization and carrier recovery of demodulator.With the DVB technical manual's proposal,on the basis of the classic Gardner timing synchronization based on the 4 times symbol rate sampling,a new method is proposed in which there is a pre-filtering module in front of the timing synchronization loop and the original single path interpolation is extended to the 4-path interpolation based on 16 times sampling.The idea and structure of the method are explained in detail and simulation experiments are carried out. The results show that this method has better bit error rate(BER)performance compared with the classical Gardner method,especially in the case of high-order modulation.
The second generation digital video broadcasting by satellite extensions(DVB-S2 X) standard gives an amplitude phase shift keying(APSK) modulation mode high to 256 orders,which results in higher requirements for symbol timing synchronization,frame synchronization and carrier recovery of demodulator.With the DVB technical manual's proposal,on the basis of the classic Gardner timing synchronization based on the 4 times symbol rate sampling,a new method is proposed in which there is a pre-filtering module in front of the timing synchronization loop and the original single path interpolation is extended to the 4-path interpolation based on 16 times sampling.The idea and structure of the method are explained in detail and simulation experiments are carried out. The results show that this method has better bit error rate(BER)performance compared with the classical Gardner method,especially in the case of high-order modulation.
引文
[1] MUELLER K,MULLER M.Timing recovery in digital syn-chronous data receivers[J]. IEEE Transactions on Com-munications,1976,24(5):516-531.
[2] GARDNER F M. Demodulator reference recovery techniques suited for digital implementation[R]. Paris:Europe-an Space Agency,1988.
[3] GARDNER F M.A BPSK/QPSK timing-error detector forsampled receivers[J].IEEE Transactions on Communica-tions,1986,34(5):423-429.
[4] OERDER M,MEYR H.Digital filter and square timing re-covery[J]. IEEE Transactions on Communications,1988,36(6):605-612.
[5] AYAT M,MIRZAKUCHAKI S,BEHESHTI-SHIRAZI A.De-sign of new digital blind feedforward timing recovery algo-rithm for linear modulations in digital communication receiv-ers[J].IET Communications,2016,10(14):1736-1743.
[6] SPALVIERI A,MAGARINI M. Minimum timing jitter intiming recovery based on pre-filtered square-law timingdetection[C]//Proceedings of 2009 Second InternationalConference on Communication Theory,Reliability,andQuality of Service.Colmar:IEEE,2009:46-51.
[7]李想,郝学坤.一种星上多载波APSK信号定时恢复方法[J].无线电工程,2017,47(1):27-31.
[8]张强,余忠洋,王力男,等.基于多元LDPC码的迭代符号定时恢复[J].信号处理,2017,33(6):819-827.
[9]刘景元,王磊,王宪平.用并行内插算法恢复宽带信号的定时信息[J].电讯技术,2017,57(8):963-966.
[10] CASINI E,GAUDENZI R,GINESI A. DVB-S2 modemalgorithms design and performance over typical satellitechannels[J].International Journal on Satellite Communi-cation Networks,2004,22(3):352-367.
[11] SUESSER-RECHBERGER B,GAPPMAIR W,GINESIA.Performance of Walsh-Hadamard codes used for tim-ing recovery in a DVB-S2x multibeam scenario[C]//Proceedings of 2016 10th International Symposium onCommunication Systems,Networks and Digital SignalProcessing(CSNDSP).Prague:IEEE,2016:1-6.
[12]杜勇.数字调制解调技术的Matlab与FPGA实现(Xilinx/VHDL版)[M].北京:电子工业出版社,2017:390-395.
[13] GARDNER F M. Phase lock techniques[M]. 3rd ed.Hoboken:John Wiley&Sons Inc.,2005.
[14]付永明,朱江,琚瑛珏.Gardner定时同步环路参数设计及性能分析[J].通信学报,2012,33(6):191-198.
[15] WIENER K,JOHN J,PROULX G.数字信号处理(Mat-lab版)[M].刘树棠,译.西安:西安交通大学出版社,2013:256-316.
[2] GARDNER F M. Demodulator reference recovery techniques suited for digital implementation[R]. Paris:Europe-an Space Agency,1988.
[3] GARDNER F M.A BPSK/QPSK timing-error detector forsampled receivers[J].IEEE Transactions on Communica-tions,1986,34(5):423-429.
[4] OERDER M,MEYR H.Digital filter and square timing re-covery[J]. IEEE Transactions on Communications,1988,36(6):605-612.
[5] AYAT M,MIRZAKUCHAKI S,BEHESHTI-SHIRAZI A.De-sign of new digital blind feedforward timing recovery algo-rithm for linear modulations in digital communication receiv-ers[J].IET Communications,2016,10(14):1736-1743.
[6] SPALVIERI A,MAGARINI M. Minimum timing jitter intiming recovery based on pre-filtered square-law timingdetection[C]//Proceedings of 2009 Second InternationalConference on Communication Theory,Reliability,andQuality of Service.Colmar:IEEE,2009:46-51.
[7]李想,郝学坤.一种星上多载波APSK信号定时恢复方法[J].无线电工程,2017,47(1):27-31.
[8]张强,余忠洋,王力男,等.基于多元LDPC码的迭代符号定时恢复[J].信号处理,2017,33(6):819-827.
[9]刘景元,王磊,王宪平.用并行内插算法恢复宽带信号的定时信息[J].电讯技术,2017,57(8):963-966.
[10] CASINI E,GAUDENZI R,GINESI A. DVB-S2 modemalgorithms design and performance over typical satellitechannels[J].International Journal on Satellite Communi-cation Networks,2004,22(3):352-367.
[11] SUESSER-RECHBERGER B,GAPPMAIR W,GINESIA.Performance of Walsh-Hadamard codes used for tim-ing recovery in a DVB-S2x multibeam scenario[C]//Proceedings of 2016 10th International Symposium onCommunication Systems,Networks and Digital SignalProcessing(CSNDSP).Prague:IEEE,2016:1-6.
[12]杜勇.数字调制解调技术的Matlab与FPGA实现(Xilinx/VHDL版)[M].北京:电子工业出版社,2017:390-395.
[13] GARDNER F M. Phase lock techniques[M]. 3rd ed.Hoboken:John Wiley&Sons Inc.,2005.
[14]付永明,朱江,琚瑛珏.Gardner定时同步环路参数设计及性能分析[J].通信学报,2012,33(6):191-198.
[15] WIENER K,JOHN J,PROULX G.数字信号处理(Mat-lab版)[M].刘树棠,译.西安:西安交通大学出版社,2013:256-316.