›› 2012, Vol. 42 ›› Issue (05): 1280-1285.

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External synchronization method based on double PLLs for nonsinusoidal orthogonal modulation in time domain

CHEN Zhao-nan, LING Qing, WANG Hong-xing, LIU Chuan-hui, ZHONG Pei-lin   

  1. Key Laboratory on Signal & Information Processing of Shandong Province, Naval Aeronautical and Astronautical University, Yantai 264001, China
  • Received:2011-08-08 Online:2012-09-01 Published:2012-09-01

Abstract: To accomplish the synchronization of nonsinusoidal orthogonal modulated signals, an external synchronization method based on double Phase-Locked Loops (PLLs) is proposed. An auxiliary sequence made up of bandpass Prolate Spheroidal Wave Function (PSWF) pulses is used in the method. The auxiliary sequence is separated from the modulated signals in the frequency domain. In the synchronization procedure, the carrier synchronization is first achieved by the narrowband PLLs. Then on this basis the baseband PSWF sequence is obtained by the coherent demodulation. Finally, the digital pulse PLLs is employed to achieve the symbol synchronization. Simulation results show that the proposed method can accomplish the synchronization quickly, and it has good robustness and strong ability to overcome noise. In particular, the method is applicable to the system, which has many parallel modulated subbands.

Key words: communication, non-sinusoidal wave, phase-locked loop, synchronization, prolate spheroidal wave function

CLC Number: 

  • TN911.3
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