Radio repeater and radio relay transmission method
First Claim
1. A radio repeater comprising at least one first reception antenna having a first-polarization characteristic;
- at least one second reception antenna having a second-polarization characteristic which is orthogonalized with respect to the first-polarization characteristic;
at least two loop interference suppressors connected to each of the reception antennas for suppressing a loop interference signal from a transmitted radio signal from the received radio signal;
at least two amplifiers for amplifying each loop interference-suppressed radio signal from each of the loop interference suppressors;
and at least one each of a first and a second transmission antenna having the second and the first-polarization characteristic, respectively, which are fed with the radio signals which have been received by the first and the second reception antenna and which have passed through the respective loop interference suppressors and the respective amplifier for transmitting the radio signals.
1 Assignment
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Accused Products
Abstract
A channel capacity is increased by using MIMO (multiple input multiple output) radio relaying system.
A transmission is made from a transmitter 10 using a first antenna 111 and a second antenna 112 having polarization characteristics which are orthogonalized to each other. A reception is made in a repeater 201 using reception antennas 211 and 212 each having the same polarization characteristic as the first and the second antenna 111 and 112, respectively. Each signal received by the first and the second reception antenna 211 and 212, respectively, is passed through loop interference suppressors 271 and 272, respectively, and through amplifiers 241 and 242, respectively, to be transmitted from the first and the second transmission antenna 211 and 212 having the same polarization characteristics as the second and the first antenna 112 and 111, respectively. A reception is made in a receiver 30 by antennas 312 and 314 having the same polarization characteristic as the first antenna 111, and the reception is also made by antennas 311 and 313 having the same polarization characteristic as the second antenna 112. These received signals are subject to a signal separation processing in MIMO equalizer 32.
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Citations
7 Claims
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1. A radio repeater comprising
at least one first reception antenna having a first-polarization characteristic; -
at least one second reception antenna having a second-polarization characteristic which is orthogonalized with respect to the first-polarization characteristic;
at least two loop interference suppressors connected to each of the reception antennas for suppressing a loop interference signal from a transmitted radio signal from the received radio signal;
at least two amplifiers for amplifying each loop interference-suppressed radio signal from each of the loop interference suppressors;
and at least one each of a first and a second transmission antenna having the second and the first-polarization characteristic, respectively, which are fed with the radio signals which have been received by the first and the second reception antenna and which have passed through the respective loop interference suppressors and the respective amplifier for transmitting the radio signals. - View Dependent Claims (2, 3, 4, 5)
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6. A radio relay transmission method comprising the steps of transmitting radio signals from a transmitter using at least one of first antennas having a first-polarization characteristic and at least one of second antennas having a second-polarization characteristic which is orthogonalized to the first-polarization characteristic;
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receiving the transmitted radio signals by at least one of the reception antennas having a polarization characteristic which is one of the first-polarization characteristic and the second-polarization characteristic;
and amplifying the received radio signal and transmitting it from a transmission antenna having a polarization characteristic which is orthogonalized to the polarization characteristic of the reception antenna for purpose of radio relaying. - View Dependent Claims (7)
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Specification