Symbol timing recovery for CPM signals based on matched filtering

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2006

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Başerdem, Çiler

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In this thesis, symbol timing recovery based on matched filtering in Gaussian Minimum Shift Keying (GMSK) with bandwidth-bit period product (BT) of 0.3 is investigated. GMSK is the standard modulation type for GSM. Although GMSK modulation is non-linear, it is approximated to Offset Quadrature Amplitude Modulation (OQAM), which is a linear modulation, so that Maximum Likelihood Sequence Estimation (MLSE) method is possible in the receiver part. In this study Typical Urban (TU) channel model developed in COST 207 is used. Two methods are developed on the construction of the matched filter. In order to obtain timing recovery for GMSK signals, these methods are investigated. The fractional time delays are acquired by using interpolation and an iterative maximum search process. The performance of the proposed symbol timing recovery (STR) scheme is assessed by using computer simulations. It is observed that the STR tracks the variations of the frequency selective multipath fading channels almost the same as the Mazo criterion.

Subject Keywords

Telecommunication (including telegraphy, telephone, radio, radar, television)

URI

http://etd.lib.metu.edu.tr/upload/12608072/index.pdf
https://hdl.handle.net/11511/16213

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

Ç. Başerdem, “Symbol timing recovery for CPM signals based on matched filtering,” M.S. - Master of Science, Middle East Technical University, 2006.