Patent ID: 8345785
Filing Date: 2013-01-01
Classification: H04B,H04L

Abstract:
1. A wireless data communication system comprising: a transmitter having M transmission antennas; and a receiver having N reception antennas, wherein data communication is executed between said transmitter and said receiver, wherein said transmitter includes a modulator that modulates a transmission signal associated with each of the transmission antennas and a demodulator that demodulates a reception signal from each of the reception antennas, wherein said data communication is executed based on a real number signal which consists of in-phase components and quadrature components of said transmission signal and said reception signal, wherein training signal vectors consist of at least two signal vectors whose component vectors for each antenna are linearly-independent of each other, wherein based on a real number transmission signal vector which has 2M components, and a real number reception signal vector which has 2N components, an arithmetic operation is performed on a 2N-row-2M-column transfer matrix which shows a relationship between a transmission signal vector and a reception signal vector which each contain deviation in an in-phase component and deviation in a quadrature component that occur during a modulation process in said modulator and deviation in an in-phase component and deviation in a quadrature component that occur during a demodulation process in said demodulator, and wherein after said training signal vectors are transmitted, said transfer matrix is estimated by using received training signal vectors, according to data to be transmitted to said receiver from said transmitter, and an arithmetic operation is performed on the real number reception signal vector to be input to said demodulator based on said transfer matrix.