Synchronization and setting system for signals received in radio base station

A synchronization protecting and setting method for signals received in a radio base station comprising the steps of:

• generating a first detecting window, which covers a position of a predetermined pattern provided in a reception signal received at the radio base station;
• generating a second detecting window, which covers the position of the predetermined pattern within the first detecting window;
• detecting the predetermined pattern in the first or second detecting window;
• and
• resetting the position of the second detecting window as related to the first detecting window under a predetermined condition,
• wherein synchronization is detected by checking coincidence of the reception signal with the predetermined pattern in the first detecting window at a first frame, the detecting means detects synchronization in the set second detecting window at a subsequent frame.

A synchronization apparatus provided in a radio base station comprising:

• a first window generator for generating a first synchronized word detecting window, which covers a position of a synchronized word provided in a reception signal received at the radio base station;
• a synchronized word detector for detecting a synchronized word present in a received signal within the first synchronized word detecting window and outputting a synchronized word detecting pulse;
• a second window generator for generating a second synchronized word detecting window, which covers the position of the synchronized word detected by the synchronized word detector as is within the same time period as the first synchronized word detecting window;
• a pulse generator for outputting a detecting pulse according to an AND condition of the synchronized word detecting pulse and the second synchronized word detecting window;
• and
• a register for resetting the position of the second synchronized word detecting window as related to the first synchronized word detecting window under a predetermined condition.

A synchronization protecting and setting method for received signals, comprising the steps of:

• detecting synchronization by checking coincidence of a reception signal with a predetermined pattern in a first detecting window at a frame a first;
• setting a position of a second detecting window, based on the detection result in the first detecting window, the second detecting window being narrower than the first detecting window;
• and
• detecting the synchronization in the set second detecting window at a subsequent frame, and
• changing said setting position of the second detecting window based on a receiving condition.