Technique for direction-of-arrival estimation without eigendecomposition and its application to beamforming at base station

A program for causing an information processing device to execute a method for estimating directions of incident signals, comprising:

• obtaining correlations among some of elements data based on received array data obtained by array antenna elements which are linearly arrayed in different spatial positions with uniform element spacings, and forming a correlation matrix from the correlations;
• estimating a noise subspace from the correlation matrix by a linear operation;
• and
• calculating a spatial spectrum obtained from the noise subspace or roots of a polynomial, and estimating the directions of incident signals.

A storage medium whose content can be read by an information processing device, storing a program which causes an information processing device to execute a method for estimating directions of incident signals, comprising:

• obtaining correlations among some elements data based on received array data obtained by array antenna elements which are linearly arrayed in different spatial positions with uniform element spacings, and forming a correlation matrix from the correlations;
• estimating a noise subspace from the correlation matrix by a linear operation;
• and
• calculating a spatial spectrum obtained from the noise subspace or roots of a polynomial, and estimating the directions of incident signals.

A direction estimating device, comprising:

• a correlation matrix defining unit for obtaining correlations among some elements data based on received array data obtained by array antenna elements which are linearly arrayed in different spatial positions with uniform element spacings, and forming a correlation matrix from the correlations;
• a noise subspace estimating unit for estimating a noise subspace from the correlation matrix by a linear operation;
• and
• a direction estimating unit for calculating a spatial spectrum obtained from the noise subspace or roots of a polynomial, and estimating a direction of an incident signal.