Patent ID: 7965784
Filing Date: 2011-06-21
Classification: H04B

Abstract:
1. A radio apparatus, comprising: a receiver which receives, from a radio apparatus to communicate with, a burst signal that comprises (1) first known signal(s) operative in a MIMO system assigned to N of M streams (N<M), (2) second known signals operative in the MIMO system assigned to the respective M streams, and (3) data assigned to the N of M streams, the N of M streams including the first known signal, the second known signal, and the data in that order; an acquiring unit which acquires, based on the burst signal received by said receiver, the number of streams in which second known signals are assigned; a decision unit which determines rate information in a range of the number of streams acquired by said acquiring unit, the rate being increased or decreased according to an increase or decrease of the number of streams; and a notification unit which notifies the radio apparatus to communicate with of the rate information determined by said decision unit.