Apparatus and method for superposition transmissions
AssigneeSamsung Electronics Co., Ltd.
InventorsHyukjoon Kwon, Linbo Li, Jungwon Lee, Sandeep Krishnamurthy
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Abstract
Apparatuses, systems, and methods are described concerning a new type of superposition multiplexing transmission constellation (super-constellation): the Gray-mapped Non-uniform-capable Constellation (GNC). Apparatuses, systems, and methods for generating GNC super-constellations are described, as well as apparatuses, systems, and methods for receiving, demapping, and decoding transmissions using GNC super-constellations. Apparatuses, systems, and methods for selecting a type of superposition multiplexing transmission constellation based on various conditions are also described.
Claims15
A method of selecting a superposition constellation comprising two or more user equipment (UE) constellations, comprising:
- determining a type of superposition constellation (super-constellation) to generate based at least on a power ratio among the two or more UEs, wherein a first type of super-constellation is a Gray-mapped Non-uniform-capable Constellation (GNC), in which both the constituent constellations of the two or more UEs and the GNC super-constellation itself are Gray-mapped, and a second type of super-constellation is a Direct Symbol Mapping (DSM);
- and
- in response to determining the type of superposition constellation as the GNC super-constellation, generating the GNC super-constellation by mapping the GNC super-constellation from outermost bits to innermost bits according to each of K number of UEs,
- wherein determining the type of super-constellation to generate comprises:
- determining to generate the GNC super-constellation with no swapping and mapping far user bits to outer bits, in response to αF>t0,
- determining to generate the GNC super-constellation with bit swapping and mapping far user bits to inner bits, in response to αF<t1, and
- determining to generate the DSM super-constellation, in response to t1<αF<t0, and
- wherein αF is a transmission power allocated to a far UE among the UEs, and t0 and t1 are two thresholds, where t1<t0.
An apparatus for selecting a superposition constellation comprising two or more user equipment (UE) constellations, the apparatus comprising:
- at least one non-transitory computer-readable medium storing instructions capable of execution by a processor;
- and
- at least one processor capable of executing instructions stored on the at least one non-transitory computer-readable medium, where the execution of the instructions results in the apparatus performing a method comprising:
- determining a type of superposition constellation (super-constellation) to generate based at least on a power ratio among the two or more UEs, wherein a first type of super-constellation is a Gray-mapped Non-uniform-capable Constellation (GNC), in which both the constituent constellations of the two or more UEs and the GNC super-constellation itself are Gray-mapped, and a second type of super-constellation is a Direct Symbol Mapping (DSM);
- and
- when the determined type of superposition constellation is the GNC super-constellation, generating the determined type of superposition constellation by mapping the GNC super-constellation from outermost bits to innermost bits according to each of K number of UEs,
- wherein determining the type of super-constellation to generate comprises:
- determining to generate the GNC super-constellation with no swapping and mapping far user bits to outer bits, in response to αF>t0,
- determining to generate the GNC super-constellation with bit swapping and mapping far user bits to inner bits, in response to αF<t1, and
- determining to generate the DSM super-constellation, in response to t1<αF<t0, and
- wherein αF is a transmission power allocated to a far UE among the UEs, and t0 and t1 are two thresholds, where t1<t0.
A non-transitory computer-readable medium storing instructions capable of execution by a processor, wherein the execution of the instructions results in the processor performing a method comprising:
- determining a type of superposition constellation (super-constellation) to generate based at least on a power ratio among two or more user equipments (UEs), wherein a first type of super-constellation is a Gray-mapped Non-uniform-capable Constellation (GNC), in which both the constituent constellations of the two or more UEs and the GNC super-constellation itself are Gray-mapped, and a second type of super-constellation is a Direct Symbol Mapping (DSM);
- and
- when the determined type of superposition constellation is the GNC super-constellation, generating the determined type of superposition constellation by mapping the GNC super-constellation from outermost bits to innermost bits according to each of K number of UEs,
- wherein determining the type of super-constellation to generate comprises:
- determining to generate the GNC super-constellation with no swapping and mapping far user bits to outer bits, in response to αF>t0,
- determining to generate the GNC super-constellation with bit swapping and mapping far user bits to inner bits, in response to αF<t1, and
- determining to generate the DSM super-constellation, in response to t1<αF<t0, and
- wherein αF is a transmission power allocated to a far UE among the UEs, and t0 and t1 are two thresholds, where t1<t0.
Dependencies are inferred from the claim text.