Patent ID: 8976732
Filing Date: 2015-03-10
Classification: H04B,H04L

Abstract:
1. A radio apparatus for receiving a packet signal composed of a plurality of streams in a Multiple-Input Multiple-Output (MIMO) system, the radio apparatus comprising: a radio unit which receives the packet signal in which a data signal is assigned to at least one of the plurality of streams in the MIMO system, a first known signal for channel estimation is assigned anterior to a data signal in a stream to which said data signal is assigned, and a second known signal for channel estimation is assigned to a timing other than a timing at which a first known signal is assigned and a timing at which a data signal is assigned, for a stream in which said data signal is not assigned; and a baseband processing unit which processes the packet signal received by said radio unit, wherein using as a reference a first known signal assigned to one of the streams where a data signal is assigned, a cyclic timing shift within a first known signal is applied to a first known signal assigned to the other streams, and a timing shift is applied to the second known signal assigned to a stream where data is not assigned.