Radio transmission system, radio communication apparatus, and radio transmission method
First Claim
1. A radio transmission system comprising:
- a plurality of antenna pairs, each antenna pair including a transmitting antenna and a receiving antenna corresponding to each other and configured such that a radio signal transmitted from the transmitting antenna in one of the plurality of antenna pairs directly arrives as a desired wave at the receiving antenna of the one antenna pair, and a radio signal transmitted from the transmitting antenna of another antenna pair different from the one antenna pair directly arrives as an unnecessary wave at the receiving antenna of the one antenna pair;
a transfer characteristic correction circuit provided for each of the antenna pairs, each transfer characteristic correction circuit configured to correct a transmission-target signal corresponding to the transmitting antenna of the corresponding antenna pair based on a transfer characteristic of a transmission space between the transmitting antenna and the receiving antenna of the corresponding antenna pair; and
a modulation functional circuit provided for each of the antenna pairs, each modulation functional circuit configured to modulate a carrier signal with a corrected signal after correction by the transfer characteristic correction circuit and transmit the modulated carrier signal from the transmitting antenna of the corresponding antenna pair, whereinfor each of a plurality of transmission-target signals, the transfer characteristic correction circuit is configured to perform only a real term-related correction operation for a desired signal and only an imaginary term-related correction operation for an unnecessary signal, and supply a real term-related corrected signal for the desired signal and an imaginary term-related corrected signal for the unnecessary signal in a pair to the modulation functional circuit, andfor each of the plurality of transmission-target signals, the modulation functional circuit quadrature-modulates for the real term-related corrected signal, for the desired signal and the imaginary term-related corrected signal, and for the unnecessary signal supplied in a pair from the transfer characteristic correction circuit.
1 Assignment
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Accused Products
Abstract
A radio transmission system includes: antenna pairs, each antenna pair being a combination of a transmitting antenna and a receiving antenna in one-to-one correspondence. A radio signal from the transmitting antenna in one of the antenna pairs reaches the receiving antenna of the one antenna pair as a desired wave directly, and a radio signal from the transmitting antenna of another antenna pair different from the one antenna pair reaches the receiving antenna of the one antenna pair as an unnecessary wave directly. A transfer characteristic correction section which performs a correction operation based on the transfer characteristic of a transmission space between the transmitting antenna and the receiving antenna for a transmission-target signal corresponding to the transmitting antenna, and a modulation functional section which modulates a carrier signal with a corrected signal after having been corrected by the transfer characteristic correction section and transmits the modulated carrier signal from the corresponding transmitting antenna, are provided in correspondence with each antenna pair.
17 Citations
23 Claims
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1. A radio transmission system comprising:
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a plurality of antenna pairs, each antenna pair including a transmitting antenna and a receiving antenna corresponding to each other and configured such that a radio signal transmitted from the transmitting antenna in one of the plurality of antenna pairs directly arrives as a desired wave at the receiving antenna of the one antenna pair, and a radio signal transmitted from the transmitting antenna of another antenna pair different from the one antenna pair directly arrives as an unnecessary wave at the receiving antenna of the one antenna pair; a transfer characteristic correction circuit provided for each of the antenna pairs, each transfer characteristic correction circuit configured to correct a transmission-target signal corresponding to the transmitting antenna of the corresponding antenna pair based on a transfer characteristic of a transmission space between the transmitting antenna and the receiving antenna of the corresponding antenna pair; and a modulation functional circuit provided for each of the antenna pairs, each modulation functional circuit configured to modulate a carrier signal with a corrected signal after correction by the transfer characteristic correction circuit and transmit the modulated carrier signal from the transmitting antenna of the corresponding antenna pair, wherein for each of a plurality of transmission-target signals, the transfer characteristic correction circuit is configured to perform only a real term-related correction operation for a desired signal and only an imaginary term-related correction operation for an unnecessary signal, and supply a real term-related corrected signal for the desired signal and an imaginary term-related corrected signal for the unnecessary signal in a pair to the modulation functional circuit, and for each of the plurality of transmission-target signals, the modulation functional circuit quadrature-modulates for the real term-related corrected signal, for the desired signal and the imaginary term-related corrected signal, and for the unnecessary signal supplied in a pair from the transfer characteristic correction circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A radio communication apparatus for a system including a plurality of antenna pairs, each antenna pair including a transmitting antenna and a receiving antenna corresponding to each other, the apparatus comprising:
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a transfer characteristic correction circuit configured to perform a correction operation based on a transfer characteristic of a transmission space between the transmitting antenna and receiving antenna of each antenna pair such that a radio signal transmitted from the transmitting antenna of one of the plurality of antenna pairs directly arrives as a desired wave at the receiving antenna of the one antenna pair, and a radio signal transmitted from the transmitting antenna of another antenna pair different from the one antenna pair directly arrives as an unnecessary wave at the receiving antenna of the antenna pair; and a modulation functional circuit configured to modulate a carrier signal with a corrected signal after correction by the transfer characteristic correction circuit and transmit the modulated carrier signal from the transmitting antenna corresponding to the antenna pair, wherein for each of a plurality of transmission-target signals, the transfer characteristic correction circuit is configured to perform only a real term-related correction operation for a desired signal and only an imaginary term-related correction operation for an unnecessary signal, and supply a real term-related corrected signal for the desired signal and an imaginary term-related corrected signal for the unnecessary signal in a pair to the modulation functional circuit, and for each of the plurality of transmission-target signals, the modulation functional circuit quadrature modulates for the real term-related corrected signal, for the desired signal and the imaginary term-related corrected signal, and for the unnecessary signal supplied in pair from the transfer characteristic correction section. - View Dependent Claims (22)
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23. A radio transmission method comprising:
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providing a plurality of antenna pairs, each antenna pair including a transmitting antenna and a receiving antenna corresponding to each other; performing radio transmission through space division multiplex such that a radio signal transmitted from the transmitting antenna of one of the plurality of antenna pairs directly arrives as a desired wave the receiving antenna of the one antenna pair, and a radio signal transmitted from the transmitting antenna of another antenna pair different from the one antenna pair directly arrives as an unnecessary wave at the receiving antenna of the one antenna pair; correcting a transmission-target signal corresponding to the transmitting antenna of the corresponding antenna pair based on a transfer characteristic of a transmission space between the transmitting antenna and the receiving antenna; modulating a carrier signal with a corrected signal after the correction; and transmitting the modulated signal from the corresponding transmitting antenna, wherein the correcting includes performing only a real term-related correction operation for a desired signal and only an imaginary term-related correction operation for an unnecessary signal, and supplying a real term-related corrected signal for the desired signal and an imaginary term-related corrected signal for the unnecessary signal in a pair, and the modulating includes quadrature-modulating for the real term-related corrected signal, for the desired signal and the imaginary term-related corrected signal, and for the unnecessary signal.
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Specification