Dissertation > Excellent graduate degree dissertation topics show

Research on Estimation Technology of QPSK Frequency Offset in Digital Satellite Communication System

Author: ChangZuo
Tutor: SuYang
School: Xi'an University of Science and Technology
Course: Electronics and Communication Engineering
Keywords: Carrier Synchronization IF DigitalReceive FFT Frequency Offset Estimation
CLC: TN927.2
Type: Master's thesis
Year: 2013
Downloads: 55
Quote: 0
Read: Download Dissertation

Abstract


In the digital communication system, the intelligence signal transmitted is the codedelement sequence, using this sequence to change some or several parameters of the carrier toimplement the digit carrier modulation. In digital satellite communications, the differentmodulation method can be used according to the different system, QPSK is the one of themain modulation method used in the current digital satellite communication system.Synchronization is a very crucial technical problem in the communication systems,whether the whole system can work validly and reliably or not depends on thesynchronization technology. Taking the carrier synchronization of the QPSK IF digitalreceiver as the breakthrough point, the estimation algorithms of the carrier frequency offset inthe digital receiver system are researched this paper.This paper closely conducts the research of carrier synchronization’s method, the causeof carrier frequency offset and its influence to the performance of digital receive system areanalyzed, and the basic theory of carrier synchronization and carrier frequency offsetestimation are elaborated, with emphasis upon the estimation and the compensation methodsof the carrier frequency offset. Among these estimation algorithms of carrier frequency offset,This paper proposed a method of the combination of fast Fournier transformation(FFT) andthe carrier frequency tracks ring circuit to estimate and to restore the carrier frequency offset.Namely using the FFT carrier frequency offset estimation for frequency traction to correct thebig frequency offset, The algorithm can detect the absolute value and positive and negativedirection of carrier frequency offset, using the carrier frequency tracking loop to correct smallfrequency offset on the basis, achieve the purpose of quickly and accurately for carriersynchronization. In addition, the feasibility and effectiveness of this method are testified by the MATLAB simulation.

Related Dissertations

  1. Beer bottles online testing related technology research,TS262.5
  2. Design of Radio Interface Based on FPGA,TN791
  3. Research on the Analysis of Power System Harmonics,TM711
  4. Design and Realization of Signal Distortion Measurement System Based on Virtual Instruments,TP274
  5. The Study of MIMO-OFDM Synchronization,TN919.3
  6. Research on Technology and Application of Hand-held Low-frequency Vibration Signals Acquisition System,TP274.2
  7. DSP and FPGA System Based on Harmonic Analysis,TM711
  8. Large-scale water animation and real-time rendering techniques,TP391.41
  9. The Design of HF ALE Signal Detection Devices,TN911.23
  10. Study on Timing and Frequency Synchronization Technology for OFDM System,TN919.3
  11. The Research into the High-Performance FFT Processor and the Accomplishment of FPGA,TN919.3
  12. Design of Protective Relay System Based on Arm+μc/os-ⅱ,TM774
  13. Digital Receiver Synchronization in Sdr and FPGA Realization,TN851
  14. Design of Airborne Radar Signal Processor,TN959.73
  15. Research on Smart Antenna Technology for OFDM,TN821.91
  16. Research on Power Supervising and Control System Based on MSP430F149,TN86
  17. Research on Channel Evaluation Technique of Adaptive Frequency Hopping System,TN914.41
  18. Planer Near-field Measurement Technology and Error Analysis,TN820
  19. Test System Research on the Doubly-fed Wind Generator,TM315
  20. Data processing technology of high-speed real-time digital oscilloscope,TM935.37
  21. The Study of DSP-Based Harmonic Measurement,TM935.2

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Satellite Communications and Space Communications > Satellite Communications
© 2012 www.DissertationTopic.Net  Mobile