Patent ID: 8503425

Claim:
A method of generating an uplink reference signal in a Single-User Multiple Input Multiple Output (SU-MIMO) system for transmitting one or more codewords in uplink, the method comprising: transmitting, at a base station, reference signal configuration information indicating the configuration of reference signals to be transmitted in uplink to a user equipment through a uplink grant Physical Downlink Control Channel (PDCCH), wherein the user equipment is set to operate according to an uplink access mode corresponding to the information; and receiving a subframe including the reference signals generated based on the reference signal configuration information from the user equipment, wherein the reference signal configuration information includes cyclic shift values of sequences of the reference signals, wherein the reference signal configuration information includes information about cyclic shifts of N (N≦M) reference signals among all M reference signals to be transmitted in uplink, and the information includes cyclic shift index of a reference signal used as a criterion among the N reference signals and offset information for determining cyclic shift indexes of remaining N−1 reference signals.