Patent ID: 8867656
Filing Date: 2014-10-21
Classification: H04B,H04L,H04W

Abstract:
1. A communication apparatus comprising: a plurality of antennas; a modulation unit configured to modulate a transmission signal according to a set modulation scheme and coding rate; a coding unit configured to code the transmission signal according to the set modulation scheme and coding rate; a transmission unit configured to code a data stream of the transmission signal by a non-spatial multiplexing scheme when a set Multi Input Multi Output (MIMO) communication scheme is the non-spatial multiplexing scheme, and to subject a plurality of data streams of the transmission signal to spatial multiplexing when the set MIMO communication scheme is a spatial multiplexing scheme; a communication quality management unit configured to obtain communication quality of a signal received at another communication apparatus which is a communication partner; a determination unit configured to determine suitability of communication by the spatial multiplexing scheme to the other communication apparatus which is the communication partner; and a setting unit configured to increase a communication level defined by a modulation scheme, a coding rate and a MIMO communication scheme as said obtained communication quality is better, the communication level by the non-spatial multiplexing scheme being lower than the communication level by the spatial multiplexing scheme, and in each MIMO communication scheme, the communication level being higher as a level of the modulation scheme and the coding rate is higher, when switching the communication level from the non-spatial multiplexing scheme to the spatial multiplexing scheme, said setting unit changing the level of the modulation scheme and the coding rate before switching and the level of the modulation scheme and the coding rate after switching depending on suitability of communication by the spatial multiplexing scheme determined by said determination unit.