| 摘要 |
PURPOSE: A structure of an initial mode synchronous device in a spread spectrum mobile communication system is provided to improve an efficiency of a communication channel by decreasing an initial synchronous time and a false alarm through two parallel matching filters. CONSTITUTION: The first and the second matching filters(31,32) are the same modules, and includes an I channel module(301,303) and a Q channel module(302,304), and outputs an energy value by calculating a relationship of an I channel and a Q channel. After this, outputs of the first adder and the second adder(307,311) are inputted to each one of the first comparator and the second comparator(308,312), and the first comparator and the second comparator(308,312) decide whether the energy value is bigger than a threshold value or not. When only one between outputs of the first and the second comparator(308,312) is high, the first and the second comparators(308,312) performs a verification procedure by transmitting a code drive signal for verification to an opposite side matching filter. And, when outputs of the first and the second comparator(308,312) are bigger than the threshold value, an AND logic mean(313) decides that a synchronization is detected, because the AND logic mean(313) outputs a high value.
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