Modulation and demodulation based on hierarchical modulation
AssigneeNtt Docomo, Inc.
InventorsSung Uk Moon, Takahiro Hayashi, Toshiyuki Futakata
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Abstract
A modulation device comprises a modulation unit (2) that modulates data in a hierarchical manner using multiple types of modulation techniques, and a transmission unit (3) that transmits the hierarchically modulated data. A demodulation device comprises a receiving unit (4) that receives the hierarchical modulation data having been subjected to hierarchical modulation using multiple types of modulation techniques, and a demodulation unit (6) that demodulates the hierarchical modulation data using a demodulation technique corresponding to a specific hierarchy of the hierarchical modulation data.
Claims6
A modulation device comprising:
- a sampling pattern generating unit configured to generate a sampling pattern for each of multiple types of modulation techniques, the sampling pattern representing information about a sampling period for acquiring discrete data along a temporal axis and information about a sampling space for acquiring discrete data along an amplitude direction;
- a modulation unit configured to modulate data in a hierarchical manner using the multiple types of modulation techniques based on the sampling pattern and to produce hierarchically modulated data that includes signal states for the multiple types of modulation techniques, such that a portion of a bit sequence which represents constellation points in a constellation plane in accordance with a first modulation technique of the modulation techniques is identical with a bit sequence which represents constellation points in a constellation plane in accordance with a second modulation technique of the modulation techniques;
- and
- a transmission unit configured to transmit the hierarchically modulated data.
A modulation method, performed on a modulation device, comprising:
- generating, at a sampling pattern generating unit, a sampling pattern for each of multiple types of modulation techniques, the sampling pattern representing information about a sampling period for acquiring discrete data along a temporal axis and information about a sampling space for acquiring discrete data along an amplitude direction;
- modulating, at a modulation device, data in a hierarchical manner using multiple types of modulation techniques based on the sampling pattern to produce hierarchical modulation data;
- producing, at the modulation device, hierarchically modulated data that includes signal states for the multiple types of modulation techniques, such that a portion of a bit sequence which represents constellation points in a constellation plane in accordance with a first modulation technique of the modulation techniques is identical with a bit sequence which represents constellation points in a constellation plane in accordance with a second modulation technique of the modulation techniques;
- and
- transmitting, at a transmitting device, the hierarchical modulation data to a demodulator of a counterpart communication device.
Dependencies are inferred from the claim text.