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US 2019/0268210 A1Published application
Data transmission method and device using non-uniform apsk constellations
AssigneeUniversite Du Luxembourg
InventorsFarbod Kayhan, Bjorn Ottersten, Bhavani Shankar Mysore Rama Rao
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Abstract
A simple construction for a family of non-uniform APSK constellations by the radial isomorphism between squares to circles is provided. The mutual information values indicate gains of at least 0.5 dB up to 1.5 dB with respect to the state of the art, such as the DVB-S2X constellations with 256 symbols. The invention also provides for a low-complexity detector of high-order modulated signals.
Claims22
A method for transmitting and receiving a digital data stream over a communication channel, wherein the method comprises the following steps:
- a) at a transmitting node, modulating the digital data stream onto a carrier wave to generate a modulated signal, the modulating including converting digital data in the data stream into symbols for transmission, the symbols being encoded into one of M possible symbols of a first M-ary signal constellation, the symbols of said first signal constellation being distributed on a plurality of C concentric circles
- b) at the transmitting node, transmitting the modulated signal over said communication channel;
- c) at a receiving node, receiving said modulated signal;
- d) at the receiving node, detecting each symbol of said received modulated signal;
- characterized in that
- said first M-ary signal constellation is such that there exists a corresponding second M-ary quadrature amplitude modulation, QAM, signal constellation having an equal plurality of C concentric squares, wherein a symbol on a given circle of the first signal constellation bijectively maps to a symbol of a corresponding QAM square, and wherein
- said step of detecting said symbols comprises the step of
- i) detecting each symbol in the modulated signal using the characteristics of the second QAM signal constellation.
5 more elements
A method for transmitting a digital data stream over a communication channel at a transmitting node, wherein the method comprising the following steps:
- modulating the digital data stream onto a carrier wave to generate a modulated signal, the modulating including converting data in the data stream into symbols for transmission, the symbols being encoded into one of M possible symbols of a first M-ary signal constellation, the symbols of said first signal constellation being distributed on a plurality of C concentric circles;
- and
- transmitting the modulated signal over said communication channel;
- characterized in that
- said first M-ary signal constellation is such that there exists a corresponding second M-ary quadrature amplitude modulation, QAM, signal constellation having an equal plurality of C concentric squares, each square being circumscribed by a corresponding circle of the first M-ary signal constellation, wherein the first symbols on a given circle of the first signal constellation bijectively map to the second symbols of a corresponding QAM square, the mapping being such that for each of said second symbols of a QAM square, a radius of said corresponding circle passes through said second symbol and its corresponding first symbol.
2 more elements
A method for receiving a digital data stream over a communication channel at a receiving node, wherein the method comprises the following steps:
- receiving a modulated signal, wherein said signal has been modulated at a transmitting node using a first M-ary signal constellation, the symbols of said first signal constellation being distributed on a plurality of C concentric circles;
- detecting each symbol of said received modulated signal;
- characterized in that
- said first M-ary signal constellation is such that there exists a corresponding second M-ary quadrature amplitude modulation, QAM, signal constellation having an equal plurality of C concentric squares, wherein a symbol on a given circle of the first signal constellation bijectively maps to a symbol of a corresponding QAM square, and wherein said step of detecting said symbols comprises the additional step of:
- i) detecting each symbol in the modulated signal using the characteristics of the second QAM signal constellation.
2 more elements
A data transmission device comprising a modulator, a transmitter and at least one memory element, the device being configured for:
- the modulator modulating a digital data stream onto a carrier wave to generate a modulated signal, the modulator converting digital data in the data stream into symbols for transmission by the transmitter, the symbols being encoded into one of M possible symbols of a M-ary signal constellation, the symbols of said first signal constellation being distributed on a plurality of C concentric circles
- the transmitter transmitting the modulated signal over a communication,
- wherein said first signal constellation is such that there exists a corresponding second M-ary quadrature amplitude modulation, QAM, signal constellation having an equal plurality of C concentric squares, each square being circumscribed by a corresponding circle of the first M-ary signal constellation, wherein the first symbols on a given circle of the first signal constellation bijectively map to the second symbols of a corresponding QAM square, the mapping being such that for each of said second symbols of a QAM square, a radius of said corresponding circle passes through said second symbol and its corresponding first symbol.
(canceled)
A data reception device comprising a receiver, a detector and at least one memory element, the device being configured for:
- the receiver receiving a modulated signal, wherein said signal has been modulated at a transmitting node using a first M-ary signal constellation, the symbols of said first signal constellation being distributed on a plurality of C concentric circles;
- the detector detecting each symbol of said received modulated signal;
- wherein said first M-ary signal constellation is such that there exists a corresponding second M-ary quadrature amplitude modulation, QAM, signal constellation having an equal plurality of C concentric squares, wherein a symbol on a given circle of the first signal constellation bijectively maps to a symbol of a corresponding QAM square, and wherein the detection means are further configured for
- i) detecting each symbol in the modulated signal using the characteristics of the second QAM signal constellation.
1 more element
(canceled)
Dependencies are inferred from the claim text.