Symbol synchronization for MSK signals based on matched filtering

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2003

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Sezginer, Serdar

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In this thesis, symbol timing recovery in MSK signals is investigated making use of matched filtering. A decision-directed symbol synchronizer cascaded with an MLSE receiver is proposed for fine timing. Correlation (matched filter) method is used to recover the timing epoch from the tentative decisions obtained from the Viterbi algorithm. The fractional delays are acquired using interpolation and an iterative maximum search process. In order to investigate the tracking performance of the proposed symbol synchronizer, a study is carried out on three possible optimum timing phase criteria: (i) Mazo criterion, (ii) the minimum squared ISI criterion (msISI), and (iii) the minimum BER criterion. Moreover, a discussion is given about the timing sensitivity of the MLSE receiver. The performance of the symbol synchronizer is assessed by computer simulations. It is observed that the proposed synchronizer tracks the variations of the channels almost the same as the msISI criterion. The proposed method eliminates the cycle slips very succesfully and is robust to frequency-selective multipath fading channel conditions even in moderate signal-to-noise ratios.

Subject Keywords

Electronics, Signal theory (Telecommunication), Telecommunication

URI

http://etd.lib.metu.edu.tr/upload/1057348/index.pdf
https://hdl.handle.net/11511/13729

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

S. Sezginer, “Symbol synchronization for MSK signals based on matched filtering,” M.S. - Master of Science, Middle East Technical University, 2003.