Radio apparatus, and method and program for controlling spatial path

• US 7,962,103 B2
• Filed: 05/11/2009
• Issued: 06/14/2011
• Est. Priority Date: 03/22/2002
• Status: Expired

• Current Assignee: Hera Wireless S.A. (Fineur International S.A.)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Doi, Yoshiharu
• Primary Examiner(s): Wendell, Andrew
• Application Number:
  US12/463,657
• Publication Number:
  US 20090239479A1
• Time in Patent Office: 764 Days
• Field of Search: 455/561, 455/562.1, 455/575.7, 455/101, 455/112, 455/115.1, 455/132, 455/133, 455/140, 455/216, 455/225, 455/67.11, 455/69, 455/522, 375/220, 375/221, 370/332
• US Class Current: 455/69
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 3/2605 Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04B 7/0408 using two or more beams, i.e. beam diversity
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/06 at the transmitting station
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/086 using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity

Abstract

A PDMA terminal establishes communication by forming a plurality of spatial paths to another single radio apparatus. A plurality of antennas constituting an array antenna are divided into a plurality of subarrays corresponding to the plurality of spatial paths respectively. An adaptive array processing unit can perform an adaptive array processing for each of the plurality of subarrays. A memory stores in advance information on the number of antennas associated with the number of spatial paths that can be formed by the array antenna. A control unit controls a processing to transmit possible multiplicity information to another radio apparatus at a prescribed timing.

Claims

1. A radio apparatus capable of communicating with another radio apparatus by forming a plurality of spatial paths therebetween, the radio apparatus comprising:

an adaptive array unit capable of performing adaptive array processing on signals corresponding to a plurality of antennas, respectively;

a storage unit which stores beforehand a value indicating possible multiplicity associated with the number of spatial paths formable by said adaptive array unit; and

a control unit which controls a processing of transmitting the value indicating possible multiplicity to the another radio apparatus at a predetermined timing.

2. A radio apparatus according to claim 1, wherein said control unit controls the processing of transmitting the value indicating possible multiplicity to the another radio apparatus in such a manner that the predetermined timing comes before a communication.

3. A radio apparatus according to claim 1, wherein said storage unit stores beforehand the number of spatial paths capable of attaining normal reception, as the value indicating possible multiplicity.

4. A radio apparatus capable of communicating with another radio apparatus by forming a plurality of spatial paths therebetween, the radio apparatus comprising:

a plurality of antennas constituting an array antenna;

an adaptive array unit capable of performing adaptive array processing on signals corresponding to the plurality of antennas, respectively;

a storage unit which stores beforehand a value indicating possible multiplicity associated with the number of spatial paths formable by said adaptive array unit; and

a control unit which controls a processing of transmitting the value indicating possible multiplicity to the another radio apparatus at a predetermined timing.

5. A radio apparatus according to claim 4, wherein said control unit controls the processing of transmitting the value indicating possible multiplicity to the another radio apparatus in such a manner that the predetermined timing comes before a communication.

6. A radio apparatus according to claim 4, wherein said storage unit stores beforehand the number of spatial paths capable of attaining normal reception, as the value indicating possible multiplicity.