Radio apparatus

• US 20070064687A1
• Filed: 09/19/2006
• Published: 03/22/2007
• Est. Priority Date: 09/22/2005
• Status: Active Grant

• Current Assignee: Hera Wireless S.A. (Fineur International S.A.)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Nakao, Seigo
• Granted Patent: US 7,551,611 B2
• Time in Patent Office: Days
• US Class Current: 370/358
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0671 using different delays between antennas
• CPC Class Codes: H04L 27/261 Details of reference signals
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04Q 2213/1308 Power supply
• CPC Class Codes: H04Q 2213/13098 Mobile subscriber
• CPC Class Codes: H04Q 2213/13166 Fault prevention
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A control unit produces a packet signal composed of a plurality of streams, based on a plurality of inputted data signals. For each of a plurality of data signals, a baseband processing unit multiples the produced packet signal by a weight vector. The control unit appends a common known signal to a header portion of a plurality of data signals, and appends a dedicated known signal to a front part preceding a data signal by which a dedicated weight vector is to be multiplied, in the plurality of data signals. Of the produced packet signal, the baseband processing unit multiplies the dedicated known signal and a data signal assigned posterior to this dedicated known signal by the dedicated weight vector, and of the produced packet signal it multiplies a part by which no dedicated weight vector is to be multiplied, by a common weight vector.

Claims

1. A radio apparatus, comprising:

an input unit which inputs a plurality of data signals each of the data signals being composed of a plurality of streams;

a generation unit which generates a single packet signal composed of a plurality of streams, based on the plurality of data signals inputted in said input unit; and

a transmitter which multiplies the packet signal, generated by said generation unit, by a weight vector for each of the plurality of streams and which transmits the packet signal multiplied by the weight vector,

wherein said generation unit appends a common known signal to a leading part of the plurality of data signals and appends a dedicated known signal to a position anterior to a data signal by which a dedicated weight vector is to be multiplied in said transmitter among the plurality of data signals, and

wherein, among the packet signals generated by said generation unit, said transmitter multiplies the dedicated known signal and a data signal placed posterior thereto by the dedicated weight vector and, among the packet signals generated by said generation unit, said transmitter multiplies a part, where no dedicated weight vector is to be multiplied, by a common weight vector.

2. A radio apparatus according to claim 1, wherein, among the plurality of data signals, said generation unit generates packet signals after assigning a plurality of data signals to a posterior part has been performed on a data signal by which the dedicated weight vector is to be multiplied in the transmitter.

3. A radio apparatus according to claim 1, wherein when among the plurality of data signals there is a data signal, where the common weight vector is to be multiplied, in said transmitter in a position posterior to a data signal where the dedicated weight vector is to be multiplied in said transmitter, said generation unit appends the common known signal to a position anterior to the data where the common weight vector is to be multiplied in said transmitter.

4. A radio apparatus according to claim 1, wherein said generation unit is such that a data signal of a high data rate is assigned to an anterior part of packet signal and a data signal of a lower signal is assigned toward a posterior part of packet signal.

5. A radio apparatus, comprising:

an input unit which inputs a plurality of data signals each of the data signals being composed of a plurality of streams;

a generation unit which generates packet signals composed of a plurality of streams, based on the plurality of data signals inputted in said input unit; and

a transmitter which multiplies the packet signal, generated by said generation unit, by a weight vector for each of the plurality of streams and which transmits the packet signal multiplied by the weight vector,

wherein said generation unit appends a common known signal to a leading part of the plurality of data signals and appends a dedicated known signal to a position anterior to a data signal by which a dedicated weight vector is to be multiplied in said transmitter among the plurality of data signals, and

wherein, among the packet signals generated by said generation unit, said transmitter multiplies the dedicated known signal and a data signal placed posterior thereto by the dedicated weight vector and, among the packet signals generated by said generation unit, said transmitter multiplies a part, where no dedicated weight vector is to be multiplied, by a common weight vector.