Patent ID: 9319116
Filing Date: 2016-04-19
CPC Classification: H04B,H04L

Claim Text:
1. A method of providing channel state information for a wireless communications channel provided between a first network node having at least M transmission antennas and a second network node having at least N reception antennas, the method comprising: determining characteristics of each of a plurality of taps resolvable in the time domain of at least one sub-channel within the channel from signals received by the at least N reception antennas over the channel from the at least M transmission antennas; arranging a set of the characteristics of each of the plurality of taps into at least one vector; quantizing the at least one vector in which a set of the characteristics of each of the plurality of taps are arranged by selecting one of a plurality of codebook vectors at a first level of a hierarchical codebook of vectors; and providing, to the first network node, an indication of an index to the one of a plurality of codebook vectors,