Patent ID: 8583055

Claim:
A multiple antenna system forming optimal beam patterns through a transmission of a training sequence between a transmitter and a receiver each including a plurality of antennas, the multiple antenna system comprising: a transmitter selecting predetermined antennas to be activated according to a stepwise increased level for forming the optimal beam patterns, and transmitting the training sequence to a receiver through the selected antennas; and a receiver selecting the predetermined antennas to be activated according to the level and transmitting to the transmitter an index of an optimal transmission weight vector significantly reducing a cost function based on the training sequence transmitted from the transmitter, wherein: the transmitter selects antennas so that the beam patterns formed by the antennas selected at a q-th level include the beam patterns formed by the antennas selected at a q+1-th level, the transmitter selects 2 q antennas at each level, and a distance D between the antennas selected at each level depends on the following Equation: D=2 n−(q+1) λ, where q is a level index, n is a total number of levels, and λ is a length of a carrier.