Apparatus and method for superposition transmissions

Patent metadata

Field	Value
Publication number	US-10855510-B2
Application number	US-201916270133-A
Country	US
Kind code	B2
Filing date	Feb 7, 2019
Priority date	Jun 9, 2015
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

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.

First claim

What is claimed is:

1. 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 α F >t 0 ,
determining to generate the GNC super-constellation with bit swapping and mapping far user bits to inner bits, in response to α F <t 1 , and
determining to generate the DSM super-constellation, in response to t 1 <α F <t 0 , and

wherein α F is a transmission power allocated to a far UE among the UEs, and t 0 and t 1 are two thresholds, where t 1 <t 0 .

2. The method of claim 1 , wherein in response to determining to generate the GNC super-constellation with no swapping and mapping the far user bits to the outer bits, generating the GNC super-constellation comprises mapping the outer bits to the far UE based on:
( b 0 ,b 1 , . . . )=( d 0 F ,d 1 F , . . . ),
wherein (b 0 ,b 1 , . . . ) represent the outer bits and (d 0 F ,d 1 F , . . . ) represent the far user bits.

3. The method of claim 2 , further comprising mapping the inner bits to a near UE among the UEs based on:
( b 2K ,b 2K+1 , . . . )=( d 0 N ,d 1 N , . . . ),
wherein (b 2K , b 2K+1 , . . . ) represent the inner bits and (d 0 N , d 1 N , . . . ) represent near user bits.

4. The method of claim 1 , wherein in response to determining to generate the GNC super-constellation with bit swapping and mapping the far user bits to the inner bits, generating the GNC super-constellation comprises mapping the inner bits to the far UE based on:
( b 2K ,b 2K+1 , . . . )=( d 0 F ,d 1 F , . . . ),
wherein (b 2K ,b 2K+1 , . . . ) represent the inner bits and (d 0 F ,d 1 F , . . . ) represent the far user bits.

5. The method of claim 4 , further comprising mapping the outer bits to a near UE based on:
( b 0 ,b 1 , . . . )=( d 0 N ,d 1 N , . . . ),
wherein (b 0 ,b 1 , . . . ) represent the outer bits and (d 0 N ,d 1 N , . . . ) represent near user bits.

6. 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 α F >t 0 ,
determining to generate the GNC super-constellation with bit swapping and mapping far user bits to inner bits, in response to α F <t 1 , and
determining to generate the DSM super-constellation, in response to t 1 <α F <t 0 , and

wherein α F is a transmission power allocated to a far UE among the UEs, and t 0 and t 1 are two thresholds, where t 1 <t 0 .

7. The apparatus of claim 6 , wherein in response to determining to generate the GNC super-constellation with no swapping and mapping the far user bits to the outer bits, generating the GNC super-constellation comprises mapping the outer bits to the far UE based on:
( b 0 ,b 1 , . . . )=( d 0 F ,d 1 F , . . . ),
wherein (b 0 ,b 1 , . . . ) represent the outer bits and (d 0 F ,d 1 F , . . . ) represent the far user bits.

8. The apparatus of claim 7 , further comprising mapping the inner bits to a near UE among the UEs based on:
( b 2K ,b 2K+1 , . . . )=( d 0 N ,d 1 N , . . . ),
wherein (b 2K , b 2K+ , . . . ) represent the inner bits and (d 0 N , d 1 N , . . . ) represent near user bits.

9. The apparatus of claim 6 , wherein in response to determining to generate the GNC super-constellation with bit swapping and mapping the far user bits to the inner bits, generating the GNC super-constellation comprises mapping the inner bits to the far UE based on:
( b 2K ,b 2K+1 , . . . )=( d 0 F ,d 1 F , . . . ),
wherein (b 2K ,b 2K+1 , . . . ) represent the inner bits and (d 0 F ,d 1 F , . . . ) represent far user bits.

10. The apparatus of claim 9 , further comprising mapping the outer bits to a near UE based on:
( b 0 ,b 1 , . . . )=( d 0 N ,d 1 N , . . . ),
wherein (b 0 ,b 1 , . . . ) represent the outer bits and (d 0 N , d 1 N , . . . ) represent the near user bits.

11. 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 α F >t 0 ,
determining to generate the GNC super-constellation with bit swapping and mapping far user bits to inner bits, in response to α F <t 1 , and
determining to generate the DSM super-constellation, in response to t 1 <α F <t 0 , and

wherein α F is a transmission power allocated to a far UE among the UEs, and t 0 and t 1 are two thresholds, where t 1 <t 0 .

12. The non-transitory computer-readable medium of claim 11 , w

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kwon Hyukjoon
• Li Linbo
• Lee Jungwon
• Krishnamurthy Sandeep

Classifications

• H04L1/007

  Unequal error protection (for format H04L1/0078; for codes per se H03M13/35) · CPC title

• H04L27/3411 Primary

  reducing the peak to average power ratio or the mean power of the constellation; Arrangements for increasing the shape gain of a signal set · CPC title

• H04L27/3405 Primary

  Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power · CPC title

• H04W52/262 Primary

  taking into account adaptive modulation and coding [AMC] scheme · CPC title

• H04L27/0008

  arrangements for allowing a transmitter or receiver to use more than one type of modulation (negotiating modulation type for two-way transmission paths H04L5/1453) · CPC title