Patent ID: 8121208
Filing Date: 2012-02-21
Classification: H04B,H04L

Abstract:
1. A receiver of a multi input multi output system (MIMO) in a space-time encoding method comprising: M receive antennas corresponding to a number of receive antennas used for receiving a signal from a space channel (M is a natural number); a maximum likelihood detector for detecting an information symbol having a minimum Euclidean distance by substituting information symbols for the signals received through the receive antennas; and a transmit antenna selector coupled between the receive antennas and the maximum likelihood detector, the transmit antenna selector for estimating a channel by using the signals received through the receive antennas, generating transmit antenna selection information for selecting M transmit antennas among N transmit antennas (N is a natural number greater than M) in a transmitter of the MIMO system with reference to an estimated channel estimate, and returning the transmit antenna selection information to the transmitter. wherein the receiver selects the M transmit antennas corresponding to a channel maximizing channel capacity by using the channel estimate, and wherein the channel capacity Cp is satisfied with the equation wherein I when a vector value y of the signals received through the receive antennas satisfies the equation: wherein O where ρ denotes a reception signal to noise ratio, Hp denotes a channel formed between the receive antennas and the transmit antennas, and wherein T denotes a transposed matrix and θ denotes √φ.