Relay station, transmission method for relay station, and communication system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorKenichi Takizawa
Life of this patent
Estimating the term…
Abstract
A first relay station capable of performing, together with a second relay station, a non-replay relay for a first radio signal transmitted from a transmitting station for a receiving station having one antenna includes an antenna, a radio and a controller. The radio includes a receiver that converts the first radio signal into a baseband signal, an FIR filter that adds a delay to the baseband signal, and a transmitter that converts the signal output from the FIR filter into a second radio signal transmitted from the antenna to the receiving station. The controller ensures that the second radio signals transmitted from the respective antennas of the first and second relay stations have different delays, and that the FIR filter The delay is set in the FIR filter.
Claims20
A relay station operating as a first relay station, and capable of executing non-regenerative relay for a first radio signal transmitted from a transmission station toward a reception station having one antenna, together with one or two or more second relay stations, the relay station comprising:
- at least one antenna;
- a wireless device corresponding to the antenna;
- and
- a controller configured to control an operation of the wireless device,
- wherein the wireless device includes:
- a receiver configured to convert the first radio signal received by the 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 toward the reception station from the antenna, and
- wherein the controller sets a delay amount in the FIR filter of the wireless device so that the second radio signal transmitted from each antenna included in the first and second relay stations has a delay different between the first and second relay stations.
A transmission method for a relay station operating as a first relay station and capable of executing non-regenerative relay for a first radio signal transmitted from a transmission station toward a reception station having one antenna, together with one or two or more second relay stations, the transmission method comprising:
- converting, by the relay station, the first radio signal received by at least one antenna included in the relay station into a baseband signal;
- assigning, by the relay station, a delay to the baseband signal using a finite impulse response (FIR) filter;
- converting, by the relay station, a signal output from the FIR filter into a second radio signal transmitted toward the reception station from the antenna;
- and
- setting, by the relay station, a delay amount in the FIR filter so that the second radio signal transmitted from each antenna included in the first and second relay stations has a delay different between the first and second relay stations.
A communications system comprising:
- a reception station with one antenna;
- a transmission station configured to transmit a first radio signal to the reception station;
- and
- a plurality of relay stations capable of relaying the first radio signal to the reception station through non-regenerative relay,
- wherein each of the plurality of relay stations includes:
- at least one antenna;
- a wireless device corresponding to the antenna;
- and
- a controller configured to control an operation of the wireless device,
- wherein the wireless device includes:
- a receiver configured to convert the first radio signal received by the 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 antenna to the reception station, and
- wherein the controller sets a delay amount in the FIR filter of the wireless device so that the second radio signal transmitted from each antenna of the plurality of relay stations has a delay different from among the plurality of relay stations.
Dependencies are inferred from the claim text.