Patent ID: 8867639

Claim:
A method for communicating between first multiple nodes and second multiple nodes in a wireless communication system, the method comprising: performing a first local sharing procedure for a virtual MIMO (Multiple Input Multiple Output) feedback among the second multiple nodes during a first predetermined time; performing feedback of channel status information from the second multiple nodes to the first multiple nodes during an integer multiple of a second predetermined time; and performing a second local sharing procedure for the virtual MIMO feedback among the first multiple nodes during the first predetermined time, wherein the first local sharing procedure is used for sharing the channel status information and a quantized precoder among the second multiple nodes, wherein, if at least one node is added in the first multiple nodes or second multiple nodes, a new precoder {tilde over (F)} is updated based on a precoder F computed previously according to Equation 1 and Equation 2, below {tilde over (F)}={tilde over (H)} T {tilde over (B)} −1 , <Equation 1> B ~ - 1 = B - 1 - B - 1 ⁢ h ~ T ⁢ h ~ ⁢ B - 1 1 + h ~ ⁢ B - 1 ⁢ h ~ T < Equation ⁢ ⁢ 2 > wherein, a new channel matrix {tilde over (H)} is [ H h ~ ] , {tilde over (h)} is channel vector of added node and {tilde over (B)} is defined as {tilde over (H)}{tilde over (H)} T , F is H T (HH T ) −1 , H is an old channel matrix and B is defined as HH T .