Claims
- 1. A wireless transmitting apparatus, comprising:
N (N is two or more integer) pieces of antennas capable of transmitting a wireless signal; and a selector which selects L (L is one or more integer, and L≦N) pieces of antennas from said N pieces of antennas and selects the types of signals to be transmitted from the selected L pieces of antennas.
- 2. The wireless transmitting apparatus according to claim 1,
wherein said selector selects said L pieces of antennas based on properties of the transmitted wireless signals and selects the types of signals to be transmitted from said L pieces of antennas based on a status of the propagation paths of the wireless signals.
- 3. The wireless transmitting apparatus according to claim 1,
wherein said selector selects said L pieces of antennas based on a status of propagation paths of the wireless signals and selects the types of signals to be transmitted from said L pieces of antennas based on properties of the transmitted wireless signal.
- 4. The wireless transmitting apparatus according to claim 1, comprising:
a plurality of encoders which encodes transmission data; N pieces of transmitters which are provided corresponding to said N pieces of antennas and supply transmission data to the corresponding antenna; and a plurality of switches which distribute outputs of said encoders to said N pieces of transmitters.
- 5. The wireless transmitting apparatus according to claim 1, comprising:
a threshold value setting part which sets a first threshold value which selects said L pieces of antennas and a second threshold value which sets types of signals to be transmitted from said L pieces of antennas; and a control information detector which detects a first control value which indicates a status of propagation path of the wireless signals and a second value which indicates properties of the wireless signal transmitted from said L pieces of antennas, wherein said selector selects said L pieces of antennas and the types of signals to be transmitted from said L pieces of antennas, based on said first and second threshold values, and said first and second control values.
- 6. The wireless transmitting apparatus according to claim 5, wherein said control information detector detects said first and second control values based on a feedback signal from a receiving apparatus which receives the transmission signal from said L pieces of antennas.
- 7. The wireless transmitting apparatus according to claim 5,
wherein said selector selects said L pieces of antennas based on a compared result between said second control value and said first threshold value, and selects the types of signals to be transmitted from said L pieces of antennas based on a compared result between said first control value and said second threshold value.
- 8. The wireless transmitting apparatus according to claim 7,
wherein said first threshold value includes a plurality of threshold values each having different a reference value; and said selector selects said L pieces of antennas based on a compared result between said second control value and said reference values.
- 9. The wireless transmitting apparatus according to claim 5,
wherein said selector increases the number of antennas to be transmitted, as said second control value is larger.
- 10. The wireless transmitting apparatus according to claim 5,
wherein said selector allows the same signal to transmit from said L pieces of antennas if said first control value is less than said second threshold value, and allows signals different from each other to transmit from said L pieces of antennas if said first control value is no less than said second threshold value.
- 11. The wireless transmitting apparatus according to claim 5,
wherein said selector selects said L pieces of antennas based on a compared result between said first control value and said first threshold value, and selects the types of signals to be transmitted from said L pieces of antennas based on a compared result between said second control value and said second threshold value.
- 12. The wireless transmitting apparatus according to claim 5,
wherein said selector stops wireless transmission from at least one of said N pieces of antennas when said first control value is no more than said first threshold value.
- 13. The wireless transmitting apparatus according to claim 5,
wherein said selector transmits the same signal from said L pieces of antennas if said second control value is less than said second threshold value, and transmits signals different from each other from said L pieces of antennas if said second control value is no less than said second threshold value.
- 14. The wireless transmitting apparatus according to claim 5, further comprising:
a threshold value storage which stores said first and second threshold values set previously, wherein said threshold value setting part sets new first and second threshold values based on said first and second threshold values stored in said threshold value storage.
- 15. The wireless transmitting apparatus according to claim 1,
wherein properties of said wireless signal include at least one of binary data, image, sound and streaming data.
- 16. A wireless communication system, comprising:
a transmitting apparatus having N (N is two or more integer) pieces of transmission antennas; and a receiving apparatus having N pieces of reception antennas, wherein said transmitting apparatus selects L (L≦N) pieces of transmission antennas among said N pieces of transmission antennas, based on a propagation path status of said N pieces of transmission antennas and properties of the wireless signal; and said receiving apparatus receives the signal transmitted from said L pieces of transmission antennas at a diversity branch.
- 17. The wireless communication system according to claim 16,
wherein said receiving apparatus has a feedback signal transmitter which sends back the transmission signal from said transmitting apparatus to said transmitting apparatus as a feedback signal; said transmitting apparatus has a control information detector which detects a first control value indicating the propagation path status and a second control value indicating the properties of the wireless signal transmitted from said L pieces of transmission antennas, based on said feedback signal; and said selector selects said L pieces of transmission antennas and the types of signals to be transmitted from said L pieces of transmission antennas, based on said first and second control values.
- 18. The wireless communication system according to claim 16,
wherein said selector selects said L pieces of antennas based on the properties of the transmitted wireless signal, and selects the types of signals transmitted from said L pieces of antennas based on the propagation path status.
- 19. The wireless communication system according to claim 16,
wherein said selector selects said L pieces of antennas based on the propagation path status and selects the types of signals to be transmitted from said L pieces of antennas based on the properties of the transmitted wireless signal.
- 20. A method of wireless transmission, comprising:
selecting L (L is one or more, and L≦M) pieces of antennas among N (N is one or more integer) pieces of antennas based on a propagation path status of wireless signals transmitted from said N pieces of antennas capable of transmitting the wireless signals and properties of the transmitted wireless signal, and selecting the types of signals to be transmitted from the selected L pieces of antennas.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2002-143560 |
May 2002 |
JP |
|
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims benefit of priority under 35USC§119 to Japanese Patent Application No. 2002-143560, filed on May 17, 2002, the entire contents of which are incorporated by reference herein.