Radio transmission apparatus and radio communication method

• US 20040087282A1
• Filed: 06/25/2003
• Published: 05/06/2004
• Est. Priority Date: 10/31/2001
• Status: Active Grant

• Current Assignee: Optis Wireless Technology, LLC (Brevet Capital)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Ishikawa, Kimihiko
• Granted Patent: US 7,130,592 B2
• Time in Patent Office: Days
• US Class Current: 455/101
• CPC Class Codes: H04B 7/0613 using simultaneous transmission H04B7/0686 takes precedence
• CPC Class Codes: H04B 7/12 Frequency diversity

Abstract

There is provided a radio transmitting apparatus capable of improving spectrum efficiency and a transmission rate while maintaining communication quality. The present apparatus adaptively selects space multiplex where different information (transmission signal A≠transmission signal B) is transmitted from a plurality of antennas with the same frequency, frequency multiplex where different information (transmission signal A≠transmission signal B) is transmitted from the plurality of antennas with different frequencies, space diversity where the same information is transmitted from the plurality of antennas with the same frequency, and frequency diversity where the same information (transmission signal A=transmission signal B) is transmitted from the plurality of antennas with different frequencies according to circumstances of a propagation path.

Claims

1. (Amended) A radio transmitting apparatus comprising:

transmitting means for transmitting the same or different information using a plurality of antennas;

acquiring means for acquiring circumstances of a propagation path; and

controlling means for controlling each transmission frequency of the plurality of antennas and the number of information transmitted from the plurality of antennas according to the circumstances of the propagation path acquired by said acquiring means.

2. A radio transmitting apparatus according to claim 1, further comprising detecting means for detecting a frequency, which is non-assigned to the other user, from a plurality of usable frequencies, wherein said controlling means sets each transmission frequency of the plurality of antennas from the frequency detected by said detecting means.

3. (Amended) A radio transmitting apparatus according to claim 1, wherein when the circumstances of the propagation path acquired by said acquiring means are good, said controlling means sets each transmission frequency of the plurality of antennas to the same frequency to transmit different information from the plurality of antennas.

4. (Amended) A radio transmitting apparatus according to claim 1, wherein when the circumstances of the propagation path acquired by said acquiring means are poor, said controlling means sets each transmission frequency of the plurality of antennas to a different frequency to transmit different information from the plurality of antennas.

5. (Amended) A radio transmitting apparatus according to claim 1, wherein when the circumstances of the propagation path acquired by said acquiring means are poor, said controlling means sets each transmission frequency of the plurality of antennas to the same frequency to transmit the same information from the plurality of antennas.

6. (Amended) A radio transmitting apparatus according to claim 1, wherein when the circumstances of the propagation path acquired by said acquiring are poor, said controlling means sets each transmission frequency of the plurality of antennas to a different frequency to transmit the same information from the plurality of antennas.

7. A radio base station apparatus having a radio transmitting apparatus according to claim 1.

8. A radio terminal apparatus having a radio transmitting apparatus according to claim 1.

9. (Amended) A radio communication method comprising the steps of:

transmitting the same or different information using a plurality of antennas;

acquiring circumstances of a propagation path; and

controlling each transmission frequency of the plurality of antennas and the number of information transmitted from the plurality of antennas according to the circumstances of the propagation path acquired by said acquiring step.