CPC H04B 7/0456 (2013.01) [H04L 25/0204 (2013.01); H04B 7/0417 (2013.01)]  26 Claims 
1. A channel estimation apparatus comprising:
a processor;
a memory configured to store a computer program that is executed by the processor, and causes the processor to perform a method including:
generating indication information for indicating M Ndimensional precoding vectors,
wherein each precoding vector is applied to one of M frequency bands, the M Ndimensional precoding vectors form a spacefrequency matrix, and the spacefrequency matrix is generated by performing a weighted combination on a plurality of spacefrequency component matrices,
wherein the spacefrequency matrix is an X×Y spacefrequency matrix, X and Y are one and the other of M and N, M≥1, N≥2, and both M and N are integers,
wherein the spacefrequency matrix is associated with one spatial stream, and
wherein quantities of frequencydomain component vectors associated with each of spacefrequency matrices of different spatial streams are the same, and a larger quantity of spatial streams is associated with a smaller quantity of frequencydomain component vectors; and
sending the indication information.
