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Research on Synchronization Algorithms in OFDM System

Author: XuYao
Tutor: WangLin
School: Xi'an University of Technology
Course: Communication and Information System
Keywords: Orthogonal Frequency Division Multiplexing Timing synchronization Frequency synchronization Training sequence Cyclic prefix
CLC: TN919.3
Type: Master's thesis
Year: 2008
Downloads: 178
Quote: 1
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Abstract


Orthogonal frequency division multiplexing is the core of the fourth generation mobile communication technology , its biggest advantages is the ability to combat wireless channel multipath propagation , and improve the utilization of the spectrum . It can increase the system capacity to meet the requirements of the next generation of wireless communication systems , high data transfer rate and high user mobile speed . Compared to the other single-carrier communication system , the OFDM systems are very sensitive to frequency offset and phase noise , since the frequency offset will destroy the orthogonality between each sub-carrier of the multi carrier system , introduced into the inter-subcarrier interference , the system performance great impact . Synchronous technology is one of the key technologies to solve the first OFDM , the main work of the OFDM system synchronization technology , including synchronization algorithm and synchronized to achieve . OFDM system model from the start , this paper first introduces the basic principles of OFDM , followed by analysis of the advantages and disadvantages of OFDM technology , focused on the synchronization of OFDM technology : OFDM demodulation performance analysis of the two types of synchronization errors ( timing deviation and frequency deviation ) the impact of in-depth research on timing synchronization and frequency synchronization algorithm in AWGN channel and frequency-selective channel simulation of various algorithms to analyze and compare a variety of synchronization performance and the scope of the various algorithms and the advantages and disadvantages , and improved timing estimation algorithm and frequency synchronization algorithm , the improved algorithm can find accurate timing position and frequency offset , the simulation results show that the improved timing algorithm has a sharp peak in the correct position , and the timing error is significantly reduced. Using the result of timing synchronization , re- setting the differential coefficient , thereby determining the size of the frequency offset , the simulation results show that the modified frequency synchronization algorithm has a smaller mean square error .

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