| 摘要 |
PURPOSE: A dynamic channel feedback control method for cooperation multipoint transmission in a network multiple input-output system is provided to adaptively control the number of feedback bits in order to feedback a channel state between base stations and target terminals. CONSTITUTION: A terminal presumes a channel hk between a base station 1 and a terminal k and a channel hk between a base station 2 and a terminal k based on pilot 1(321). The base station 1 decides the size of the code book for the size of a codebook based on the states of the channel hk. The base station 1 constitutes the code book corresponding to the base station 1 and the code book corresponding to the base station 2(332). The base station 1 generates a CDI1(Channel Direction Information1) and CDI2(341). |
