| US 7,613,261 B2 | ||
| Method of estimating symbol synchronization in OQPSK demodulator | ||
| Hyun Suk Lee, Kyungki-Do (Korea, Republic of); and Sang Hyun Min, Kyungki-Do (Korea, Republic of) | ||
| Assigned to Samsung Electro-Mechanics Co., Ltd., Kyungki-Do (Korea, Republic of) | ||
| Filed on Sep. 26, 2006, as Appl. No. 11/535,299. | ||
| Claims priority of application No. 10-2005-0092040 (KR), filed on Sep. 30, 2005. | ||
| Prior Publication US 2007/0076823 A1, Apr. 05, 2007 | ||
| Int. Cl. H04L 7/00 (2006.01) | ||
| U.S. Cl. 375—354 [375/331] | 7 Claims |
| 1. A method of estimating symbol synchronization in an Offset Quadrature Phase Shift Keying (OQPSK) demodulator, comprising
steps of:
(i) correlating a digital reception signal with a preset reference symbol to acquire self-correlation values sequentially
for individual symbol units;
(ii) adding, out of the self-correlation values included in a plurality of symbol periods, each of the self-correlation value
in due order in an arbitrary symbol and at least one other self-correlation value set apart by a symbol period from a time
point of the self-correlation value to acquire an added correlation value;
(iii) comparing between the added correlation value and the reference correlation value as to which is greater;
(iv) detecting a maximum correlation value out of added correlation values included in a plurality of subsequent symbols from
a time point where the added correlation value is greater than the reference correlation value;
(v) setting a value corresponding to a predetermined proportion of the maximum added correlation value as a new reference
correlation value;
(vi) comparing between a subsequent added correlation value and the new reference correlation value as to which is greater;
and
(vii) estimating a time point at which the self-correlation value is greater than the new reference correlation value as a
time point of synchronization and outputting a symbol synchronization signal at the time point of synchronization.
|