| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for determining the CDD (cyclic delay diversity) delay value (group) in precoding system with CDD, and a relating system, a base station, and UE (user equipment), to realize adaptive update of the CDD delay value (group), thereby ensuring the system performance to the most extent. SOLUTION: This method includes: a step A1 for obtaining an optimal CCD delay value in the precoding codebook for obtaining the best channel quality on each sub-band respectively based on a result of channel estimation and feeding back to the BS (base station) by the UE; a step A2 for selecting an overall CDD delay value in the precoding codebook based on CDD delay values of the local optimal precoding codebook received from each UE by the BS; and a step A3 for updating the CDD delay values in the precoding codebook based on the selected overall CDD delay value in the precoding codebook by the BS. COPYRIGHT: (C)2008,JPO&INPIT |
