Patent ID: 7860058

Claim:
A method for inserting a downlink common pilot, which is adaptable to the OFDMA TDD system and comprises steps of: A: dividing data to be transmitted into several segments to be transmitted in several continuous time periods, each time period comprising several slots with at least one downlink slot; and B: inserting a common pilot in one downlink slot in the time period; wherein the time period comprises slots in one or more frame; wherein when TDD system adopts a same frame structure with TD-SCDMA system and when in each sub-frame of the TD-SCDMA system, normal slots TS 0 , TS 2 , TS 3 , TS 5 , and TS 6 are downlink slots and TS 1 and TS 4 are uplink slots, TS 5 and TS 6 in each sub-frame and TS 0 , DwPTS, GP, UpPTS, and TS 1 in a subsequent sub-frame are allocated into a time period a and TS 2 , TS 3 , TS 4 are allocated into a time period b, a downlink common pilot is inserted into one of the TS 0 and DwPTS in the time period a and a downlink common pilot is inserted into the TS 3 in the time period b; wherein when TDD system adopts a same frame structure with TD-SCDMA system and when in each sub-frame of the OFDMA TDD system, normal slots TS 0 , TS 2 , TS 4 and TS 6 are downlink slots and TS 1 , TS 3 and TS 5 are uplink slots, TS 6 in each sub-frame and TS 0 , DwPTS, GP, UpPTS and TS 1 in a subsequent sub-frame are allocated into a time period c, TS 2 and TS 3 are allocated into a time period d, and TS 4 and TS 5 are allocated into a time period e, a downlink common pilot is inserted into one of the TS 0 and DwPTS in the time period c, a downlink common pilot is inserted into the TS 2 in the time period d and a downlink common pilot is inserted into the TS 4 in the time period e.