Information processing apparatus and information processing method, and non-transitory computer readable medium storing information processing program

An information processing method comprising:

• a transmission channel estimation step of performing transmission channel estimation for reception signals received by NR base station antennas comprising N antenna subsets (N is a natural number no less than two) each comprising M antennas (M is a natural number no less than two) (note that NR=M×N), and thereby outputting estimated transmission channel values;
• a first covariance matrix generation step of dividing the estimated transmission channel values into N groups and obtaining a respective first covariance matrix with M rows and N columns for each of the estimated transmission channel value groups;
• a first averaging step of averaging each of the generated first covariance matrixes over a predetermined range in terms of at least a time or a frequency;
• a first eigenvector generation step of generating N first eigenvectors or first eigenvector equivalents based on respective N outputs obtained in the first averaging step;
• a composite channel generation step of generating respective composite transmission channels between the base station antennas and terminal antennas from the respective N first eigenvectors or the first eigenvector equivalents and the estimated transmission channel values;
• a second covariance matrix generation step of obtaining second covariance matrixes for the respective composite transmission channels generated in the composite channel generation step;
• a second averaging step of averaging the second covariance matrixes generated in the second covariance matrix generation step over a different range from the predetermined range used in the first averaging step;
• a second eigenvector generation step of outputting at least one of second eigenvector or second eigenvector equivalent based on each of N average values derived in the second averaging step;
• and
• a combination step of combining the N first eigenvectors or the first eigenvector equivalents generated in the first eigenvector generation step and the at least one of the second eigenvector or the second eigenvector equivalent generated in the second eigenvector generation step and thereby obtains a beam forming weight.

A non-transitory computer readable medium storing an information processing program that causes a computer to execute:

• a transmission channel estimation step of performing transmission channel estimation for reception signals received by NR base station antennas comprising N antenna subsets (N is a natural number no less than two) each comprising M antennas (M is a natural number no less than two) (note that NR=M×N), and thereby outputting estimated transmission channel values;
• a first covariance matrix generation step of dividing the estimated transmission channel values into N groups and obtaining a respective first covariance matrix with M rows and N columns for each of the estimated transmission channel value groups;
• a first averaging step of averaging each of the generated first covariance matrixes over a predetermined range in terms of at least a time or a frequency;
• a first eigenvector generation step of generating N first eigenvectors or first eigenvector equivalents based on respective N outputs obtained in the first averaging step;
• a composite channel generation step of generating respective composite transmission channels between the base station antennas and terminal antennas from the respective N first eigenvectors or the first eigenvector equivalents and the estimated transmission channel values;
• a second covariance matrix generation step of obtaining second covariance matrixes for the respective composite transmission channels generated in the composite channel generation step;
• a second averaging step of averaging the second covariance matrixes generated in the second covariance matrix generation step over a different range from the predetermined range used in the first averaging step;
• a second eigenvector generation step of outputting at least one of second eigenvector or second eigenvector equivalent based on each of N average values derived in the second averaging step;
• and
• a combination step of combining the N first eigenvectors or the first eigenvector equivalents generated in the first eigenvector generation step and the at least one of the second eigenvector or the second eigenvector equivalent generated in the second eigenvector generation step and thereby obtains a beam forming weight.