Method and circuitry for determining symbol timing for time...

Details Method and circuitry for determining symbol timing for time... Method and circuitry for determining symbol timing for time...

H - Electricity

03

D

363/17

H03D 3/02 (2006.01) H04L 7/02 (2006.01) H04L 27/233 (2006.01)

Patent

CA 1312389

ABSTRACT OF THE DISCLOSURE In order to correctly demodulate a received sequential burst of symbols in a Time Division Multiple Access (TDMA) radio system, proper symbol timing is necessary. A method and circuitry for estimating symbol timing is disclosed in which the IF radio signal is sampled and digitized at a sampling rate which is sixteen times the symbol rate. The digitized samples are processed to obtain phase values. A one symbol delay is introduced and differential phase values derived, a differential phase value being derived for each of the sixteen sampling times per symbol. The differential phase values are compared with expected differential phase values and the absolute differences are accumulated for each sampling time over substantially the entire burst. The symbol timing is selected to be the particular one-of-the-sixteen sampling times that results in the minimum sum of differences.

596527

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