Radio transmission device and radio transmission method

• US 20050117520A1
• Filed: 08/11/2003
• Published: 06/02/2005
• Est. Priority Date: 09/13/2002
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Miyoshi, Kenichi
• Granted Patent: US 7,567,583 B2
• Time in Patent Office: Days
• US Class Current: 370/238
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0613 using simultaneous transmission H04B7/0686 takes precedence
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0667 of delayed versions of same signal using space-time coding H04L1/0618
• CPC Class Codes: H04B 7/0671 using different delays between antennas
• CPC Class Codes: H04B 7/0673 using feedback from receiving side
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04B 7/0842 Weighted combining
• CPC Class Codes: H04L 1/0006 by adapting the transmission format
• CPC Class Codes: H04L 1/0015 characterised by the adaptation strategy
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0618 Space-time coding
• CPC Class Codes: H04L 1/1657 Implicit acknowledgement of correct or incorrect reception, e.g. with a moving window
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1893 Physical mapping arrangements physical resource mapping in general H04L5/00

Abstract

Data streams stored in buffers (101) are modulated by modulation sections (102). Multipliers (103) multiply the signals output from the modulation sections (102) by weights output from a weight control section (112). The signals output from the multipliers (103) are added up by addition sections (104), subjected to radio transmission processing by transmission radio sections (105) and sent through antennas (106). A buffer control section (111) controls the buffers (101) based on a retransmission count output from a retransmission count detection section (110). The weight control section (112) outputs weights different from weights at the time of previous transmission to the multipliers (103) every time data is retransmitted. This allows a diversity gain at the time of data retransmission to be increased even if a time variation of the propagation path environment for radio signals is slow.

Claims

1. A radio transmission apparatus comprising:

a transmission section that carries out weighting or delay processing on a plurality of data streams and transmits the data streams from a plurality of transmission systems; and

a control section that controls said weighting or delay processing so that at the time of retransmission of said plurality of data streams, the transmitted data streams follow a propagation path in an environment different from that at the time of previous transmission.

8. The radio transmission apparatus according to claim 1, wherein said control section performs said control based on propagation path information notified from the receiving side.

9. The radio transmission apparatus according to claim 1, wherein said transmission is diversity transmission.

10. The radio transmission apparatus according to claim 1, wherein said plurality of data streams is transformed into a multicarrier beforehand.

11. The radio transmission apparatus according to claim 10, wherein said transformation into a multicarrier is OFDM (Orthogonal Frequency Division Multiplex) processing.

2. A radio transmission apparatus comprising:

a multiplication section that multiplies a plurality of data stream by a plurality of weights respectively;

a transmission section that transmits the plurality of weighted data streams from a plurality of transmission systems simultaneously; and

a control section that controls said multiplication section so that at the time of retransmission of said plurality of data streams said plurality of data streams is multiplied by weights different from the weights at the time of previous transmission.

3. The radio transmission apparatus according to claim 2, wherein said control section selects weights at the time of the retransmission from among a plurality of weights corresponding to said plurality of data streams at the time of the previous transmission.

4. A radio transmission apparatus comprising:

a transmission section that transmits a plurality of data streams at predetermined transmission timings from a plurality of transmission systems respectively; and

a control section that controls said transmission section at the time of the retransmission of said plurality of data streams so that the difference in transmission timings between said plurality of data streams differs for the previous transmission and the transmission this time.

6. The radio transmission apparatus according to claim 4, wherein said control section selects a transmission timing for the transmission this time from among a plurality of transmission timings corresponding to said plurality of data streams at the time of the previous transmission.

5. A radio transmission apparatus comprising:

a transmission section that transmits a plurality of data streams from a plurality of transmission systems at transmission timings differing from one transmission system to another; and

a control section that controls said transmission section at the time of retransmission of said plurality of data streams so that the difference in transmission timings between said plurality of transmission systems differs for previous transmission and transmission this time.

7. The radio transmission apparatus according to claim 5, wherein said control section selects a transmission timing for the transmission this time from among a plurality of transmission timings corresponding to said plurality of data streams at the time of the previous transmission.

12. A radio reception apparatus comprising:

a reception section that receives a plurality of signals which has been sent from a radio transmission apparatus and followed different propagation paths simultaneously using a plurality of antennas;

a propagation path information acquisition section that acquires information on the characteristics of the propagation paths which said plurality of signals followed;

a data acquisition section that acquires received data streams from the plurality of signals received by said reception section based on the information on the characteristics of the propagation paths acquired by said propagation path information acquisition section;

a combination section that combines received data streams acquired by said data acquisition section at the time of previous reception and received data streams acquired at the time of re-reception; and

a notification section that notifies said radio transmission apparatus of the information on the characteristics of the propagation paths acquired by said propagation path information acquisition section.

13. A radio transmission method comprising:

a multiplication step of multiplying a plurality of data streams by a plurality of weights respectively;

a transmission step of simultaneously transmitting the plurality of weighted data streams from a plurality of transmission systems; and

a control step of performing control so that at the time of retransmission of said plurality of data streams said plurality of data streams is multiplied by weights different from the weights at the time of previous transmission respectively.

14. A radio transmission method comprising:

a transmission step of transmitting a plurality of data streams at predetermined transmission timings from a plurality of transmission systems respectively; and

a control step of performing control so that at the time of retransmission of said plurality of data streams, the difference in transmission timings between said plurality of data streams differs for the previous transmission and the transmission this time.

15. A radio transmission method comprising:

a transmission step of transmitting a plurality of data streams from a plurality of transmission systems at transmission timings differing from one transmission system to another; and

a control step of performing control so that at the time of retransmission of said plurality of data streams, the difference in transmission timings between said plurality of transmission systems differs for the previous transmission and the transmission this time.

16. A radio reception method comprising:

a reception step of simultaneously receiving a plurality of signals which has been transmitted from a radio transmission apparatus and followed different propagation paths using a plurality of antennas;

a propagation path information acquisition step of acquiring information on the characteristics of the propagation paths which said plurality of signals followed;

a data acquisition step of acquiring received data streams from the plurality of received signals based on the information on the characteristics of the propagation paths acquired in said propagation path information acquisition step;

a combination step of combining received data streams acquired at the time of previous reception in said data acquisition step and received data streams acquired at the time of re-reception; and

a notification step of notifying said radio transmission apparatus of the information on the characteristic of the propagation paths acquired in said propagation path information acquisition step.