Patent ID: 8699611
Filing Date: 2014-04-15
Classification: H04B,H04L

Abstract:
1. A wireless communication apparatus comprising: an index value control unit configured to transmit, to a different wireless communication apparatus, one or more index values which indicate one or more precoding matrices to be used for precoding performed by the different wireless communication apparatus; and a deprecoding unit configured to perform deprecoding using precoding matrices corresponding to the one or more index values transmitted by the index value control unit in past, wherein the index value control unit transmits, to the different wireless communication apparatus at each transmission timing, index values generated based on a result of a channel condition measurement for entire or some of sub-frequency bands belonging to a predetermined frequency band, a count of the index values transmitted to the different wireless communication apparatus being less than a count, N, of the entire sub-frequency bands belonging to the predetermined frequency band, and the deprecoding unit selects, from the one or more index values transmitted by the index value control unit in the past, an index value to be applied to a data block for which no index value is transmitted, according to a time or a frequency of the data block for which no index value is transmitted, and performs deprecoding for the data block for which no index value is transmitted, using the selected index value, and wherein the index value control unit transmits index values to the wireless communication apparatus in a discontinuous manner so that index values corresponding to some data blocks are transmitted but index values corresponding to other data blocks are not transmitted, rather than transmitting index values corresponding to all data blocks in a continuous manner.