H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/110
H04B 1/16 (2006.01) H04L 27/227 (2006.01) H04L 27/233 (2006.01) H04L 7/04 (2006.01) H04L 27/00 (2006.01)
Patent
CA 1211794
47 ABSTRACT This frequency correction method is used in the receiver of a data transmission system in which a syn- chronizing word is transmitted before the data. It com- prises several steps during each of which there are calculated at least one pair of in-phase partial corre- lations Cr(k-l), Cr(k) and at least one pair of quad- rature partial correlations Ci(k-l), Ci(k). The partial correlations of the order (k-l) and (k) in each step relate to two consecutive portions of the same length of a local synchronizing word and the samples of the received demodulated signal; the portions of a step p are greater than the portions of step p - l, the partial correlations of a step p are phase-corrected by taking account of the frequency correction calculated in step p - l. A fre- quency deviation is calculated from the partial correla- tions of each step. The final frequency correction to be retained is the sum of the frequency deviations calculated at the end of each step.
425288
Deconche Alain
Van Uffelen Jean-Pierre H.
N.v.philips'gloeilampenfabrieken
Van Steinburg C.e.
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