| abstract |
The present invention relates to a channel detection method and device in a system having a large number of antennas. In an embodiment, a method used in a base station having N transmitting antennas in a multiple input multiple output (MIMO) system is provided, which includes: determining N BF orthogonal pilot patterns and other M orthogonal pilot patterns; performing beamforming on N BF subspaces, and sending a pilot signal on each beam, where pilot signals on the beams of the N BF subspaces are sent respectively over the N BF pilot patterns; and sending pilot signals over at least a part of the M pilot patterns through each of the N transmitting antennas, in a manner that sub-directions in each subspace use the orthogonal pilot patterns, where a value of N BF is 10%~15% of N, and a value of M is 15%~50% of N. By using channel sparsity of the system having a large number of antennas, pilot overhead is reduced, and at least equivalent system performance can be achieved. |