Relay station, transmission method for relay station, and communication system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorKenichi Takizawa
Life of this patent
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Abstract
A relay station comprises antennas, wireless devices corresponding to the antennas, and a controller to control an operation of the wireless devices. Each of the wireless devices includes a receiver to convert the first radio signal received by a corresponding antenna into a baseband signal, an FIR filter to assign a delay to the baseband signal; and a transmitter to convert a signal output from the FIR filter into a second radio signal transmitted from the corresponding antenna to the reception station. The controller sets a different delay amount in the FIR filter in each of the wireless devices so that the FIR filter assigns a delay, which is different from among the antennas, to the baseband signal input from the receiver in each of the wireless devices.
Claims20
A relay station capable of executing non-regenerative relay of a first radio signal transmitted from a transmission station to a reception station having one antenna, the relay station comprising:
- a plurality of antennas;
- a plurality of wireless devices corresponding to the plurality of antennas, respectively;
- and
- a controller configured to control an operation of the plurality of wireless devices, wherein
- each of the plurality of wireless devices includes
- a receiver configured to convert the first radio signal received by a corresponding antenna into a baseband signal;
- a finite impulse response (FIR) filter configured to assign a delay to the baseband signal;
- and
- a transmitter configured to convert a signal output from the FIR filter into a second radio signal transmitted from the corresponding antenna to the reception station,
- wherein the controller sets a different delay amount in the FIR filter in each of the plurality of wireless devices so that the FIR filter assigns a delay, which is different from among the plurality of antennas, to the baseband signal input from the receiver in each of the plurality of wireless devices.
A transmission method for a relay station including a plurality of antennas, the method comprising executing by the relay station:
- receiving, by each of the plurality of antennas, a first radio signal transmitted from a transmission station to a reception station having one antenna;
- converting the first radio signal received by each of the plurality of antennas into a baseband signal corresponding to each of the plurality of antennas;
- assigning a delay, which is different from among the plurality of antennas, to each of the baseband signals corresponding to the plurality of antennas by using a plurality of finite impulse response (FIR) filters;
- and
- converting each of signals output from the plurality of FIR filters into a second radio signal for the reception station and transmitting the second radio signal from a corresponding antenna.
A communication system comprising:
- a transmission station;
- a reception station with one antenna;
- and
- at least one relay station capable of executing non-regenerative relay for a first radio signal transmitted from the transmission station to the reception station, wherein
- the relay station includes
- a plurality of antennas,
- a plurality of wireless devices corresponding to the plurality of antennas, respectively;
- and
- a controller configured to control an operation of the plurality of wireless devices,
- each of the plurality of wireless devices includes
- a receiver configured to convert the first radio signal received by the corresponding antenna into a baseband signal,
- a finite impulse response (FIR) filter configured to assign a delay to the baseband signal, and
- a transmitter configured to convert a signal output from the FIR filter into a second radio signal transmitted from the corresponding antenna to the reception station, and
- the controller sets a different delay amount in the FIR filter in each of the plurality of wireless devices so that the FIR filter assigns a delay, which is different from among the plurality of antennas, to the baseband signal input from the receiver in each of the plurality of wireless devices.
Dependencies are inferred from the claim text.