Patent ID: 8743986

Claim:
A method of receiving data at a terminal in a cell boundary in a mobile communication system which supports Multi Input Multi Output (MIMO), comprising: receiving a first data stream transmitted through multiple transmission antennas from a serving base station; receiving, from a collaborating base station, a second data stream, which is precoded to make at least one of time delay, antenna permutation and stream permutation of the second data stream different from that of the first data stream based on the same source data as the first data stream and is transmitted through multiple transmission antennas; and decoding the first and second data streams, wherein the first data stream and the second data stream are precoded using first and second diagonal matrices for differently setting the time delay according to base stations, wherein the first data stream and the second data stream are respectively precoded by Equations 1 and 2: y S =D S ×W S ×z Equation 1 y C =D C ×W C ×z Equation 2 where, y S denotes a precoded data stream of the serving base station, y C denotes a precoded data stream of the collaborating base station, D S denotes an N T ×N T diagonal matrix of the serving base station, D C denotes an N T ×N T diagonal matrix of the collaborating base station for differently setting the time delay from the first data stream, W s denotes an N T ×N S precoder matrix of the serving base station, W C denotes an N T ×N S precoder matrix of the collaborating base station, z denotes a stream vector to be precoded, N T denotes the number of transmission antennas, and N S denotes a number count of the first and second streams, and wherein D S and D C are respectively determined by Equations 3 and 4: D S =D′ S ×D OS Equation 3 D C =D′ C ×D OC Equation 4 where D OS and D OC denote N T ×N T diagonal matrices for generating phase shift between data streams through a plurality of transmission antennas in single-cell MIMO, and D′ S and D′ C denote N T ×N T delay diagonal matrices further applied for differently setting the time delay according to base stations.