Apparatus and method for providing feedback information in response to subcarrier reception
A radio communication apparatus capable of alleviating a burden in setting a transmission format and suppressing increases in the scale of the apparatus. In this apparatus, space multiplexing adaptability detection section ( 108 ) detects space multiplexing transmission adaptability for divided bands (DB- 1 to DB-Nd) obtained by dividing a communication band to which Ns subcarrier signals belong in multicarrier transmission and to which a plurality of subcarrier signals belong, and outputs the detection results (# 1 to #Nd). Transmission format setting section ( 110 ) sets a transmission format when carrying out radio transmission based on the detection results (# 1 to #Nd) from space multiplexing adaptability detection section ( 108 ).
1. A mobile station apparatus that communicates with a base station apparatus using a multicarrier scheme, in which the multicarrier scheme uses a plurality of divided bands in a communication band, and each divided band is composed of a plurality of subcarriers, the mobile station apparatus comprising:
a generating section that generates, for one or more divided bands among the plurality of divided bands, feedback information using a feedback format including a spatial multiplexing number of a spatial multiplexing transmission, wherein one feedback format corresponds to one divided band; and
a transmission section that feeds back the generated feedback information to the base station apparatus.
2. The mobile station apparatus according to claim 1 , wherein the feedback format further includes one or more of a modulation scheme and a coding rate.
3. The mobile station apparatus according to claim 1 , further comprising:
a detecting section that detects, for one or more divided bands among the plurality of divided bands, a reception quality of the spatial multiplexing transmission, and wherein
the generating section generates the feedback information by deriving one or more of the spatial multiplexing number, a modulation scheme and a coding rate, based on the detected reception quality.
4. A feedback method performed by a mobile station apparatus that communicates with a base station apparatus using a multicarrier scheme, in which the multicarrier scheme uses a plurality of divided bands in a communication band, and each divided band is composed of a plurality of subcarriers, the feedback method comprising:
generating, for one or more divided bands among the plurality of divided bands, feedback information using a feedback format including a spatial multiplexing number, wherein one feedback format corresponds to one divided band; and
feeding back the generated feedback information to the base station apparatus.
5. The feedback method according to claim 4 , wherein the feedback format further includes one or more of a modulation scheme and a coding rate.
6. The feedback method according to claim 4 , further comprising:
detecting, for one or more divided bands among the plurality of divided bands, a reception quality of the spatial multiplexing transmission, and
generating the feedback information by deriving one or more of the spatial multiplexing number, a modulation scheme and a coding rate, based on the detected reception quality.