Adaptive modulation transmission system, transmission device, reception device, and method thereof
First Claim
1. An adaptive modulation transmission system comprising a transmission device and a reception device, wherein the adaptive modulation transmission system is adapted to change a modulation parameter according to a propagation path quality between the transmission device and the reception device and to change a code multiplicity according to an amount of a data to be transmitted from the transmission device to the reception device, wherein the transmission device comprises:
- a signal modulation unit configured to modulate the data according to the modulation parameter;
a code multiplexing unit configured to perform code multiplexing according to the code multiplicity;
a code multiplexing controller configured to select the code multiplicity according to a predetermined value of the amount of the data to be transmitted; and
an adaptive modulation controller configured to set a threshold of the propagation path quality for defining a region of the propagation path quality to which a combination of the modulation parameter and the code multiplicity is applicable, compare the threshold with the propagation path quality, select the combination of the modulation parameter and the code multiplicity based on a result of the comparison, and output the selected modulation parameter to the signal modulation unit.
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Abstract
An adaptive modulation transmission system is disclosed that is capable of assigning a combination of a modulation parameter and a code multiplicity according to a user requirement and a propagation path condition between a transmission device and a reception device. The transmission device includes a signal modulation unit to modulate data according to the modulation parameter, a code multiplexing unit to perform code multiplexing according to the code multiplicity, a code multiplexing controller to select the code multiplicity according to the required amount of transmission data, and an adaptive modulation controller. The adaptive modulation controller sets a threshold of the propagation path quality to define a region to which a combination of the modulation parameter and the code multiplicity is applicable, selects the combination of the modulation parameter and the code multiplicity based on a comparison result of the threshold and measured propagation path quality, and outputs the selected modulation parameter to the signal modulation unit.
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Citations
13 Claims
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1. An adaptive modulation transmission system comprising a transmission device and a reception device, wherein the adaptive modulation transmission system is adapted to change a modulation parameter according to a propagation path quality between the transmission device and the reception device and to change a code multiplicity according to an amount of a data to be transmitted from the transmission device to the reception device,
wherein the transmission device comprises: -
a signal modulation unit configured to modulate the data according to the modulation parameter;
a code multiplexing unit configured to perform code multiplexing according to the code multiplicity;
a code multiplexing controller configured to select the code multiplicity according to a predetermined value of the amount of the data to be transmitted; and
an adaptive modulation controller configured to set a threshold of the propagation path quality for defining a region of the propagation path quality to which a combination of the modulation parameter and the code multiplicity is applicable, compare the threshold with the propagation path quality, select the combination of the modulation parameter and the code multiplicity based on a result of the comparison, and output the selected modulation parameter to the signal modulation unit. - View Dependent Claims (2, 3)
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4. An adaptive modulation transmission method for changing a modulation parameter according to a propagation path quality between a transmission device and a reception device and changing a code multiplicity according to an amount of a data to be transmitted from the transmission device to the reception device, said adaptive modulation transmission method comprising the steps of:
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setting a threshold of the propagation path quality for defining a region of the propagation path quality to which a combination of the modulation parameter and the code multiplicity is applicable;
comparing the threshold with the propagation path quality;
selecting the combination of the modulation parameter and the code multiplicity based on a result of the comparison; and
modulating the data according to the selected modulation parameter and performing code multiplexing according to the selected code multiplicity. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A transmission device adapted to change a modulation parameter according to a propagation path quality between the transmission device and a reception device and to change a code multiplicity according to an amount of a data to be transmitted from the transmission device to the reception device, the transmission device comprising:
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a signal modulation unit configured to modulate the data according to the modulation parameter;
a code multiplexing unit configured to perform code multiplexing according to the code multiplicity;
a code multiplexing controller configured to select the code multiplicity according to a predetermined value of the amount of the data to be transmitted; and
an adaptive modulation controller configured to set a threshold of the propagation path quality for defining a region of the propagation path quality to which a combination of the modulation parameter and the code multiplicity is applicable, compare the threshold with the propagation path quality, select the combination of the modulation parameter and the code multiplicity based on a result of the comparison, and output the selected modulation parameter to the signal modulation unit. - View Dependent Claims (12)
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13. A reception device for receiving data transmitted from a transmission device for changing a modulation parameter according to a propagation path quality between the transmission device and the reception device and changing a code multiplicity according to an amount of a data to be transmitted from the transmission device to the reception device, said reception device comprising:
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a measurement unit configured to measure the propagation path quality; and
a transmission unit configured to transmit the measured propagation path quality to the transmission device.
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Specification