Apparatus and method for superposition transmissions

Patent metadata

Field	Value
Publication number	US-10212020-B2
Application number	US-201614997106-A
Country	US
Kind code	B2
Filing date	Jan 15, 2016
Priority date	Jun 9, 2015
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

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 constellations of two or more user equipments (UEs), comprising:
determining which type of superposition constellation (super-constellation) to generate based at least on a power ratio among the two or more UEs, wherein one 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 a GNC super-constellation itself are Gray-mapped; and
generating the determined type of superposition constellation,
wherein the determined type of superposition constellation is the GNC super-constellation,
wherein generating the GNC super-constellation comprises mapping symbols in accordance with parameters p and q, which are positive real-valued numbers, of the super-constellation,
wherein q is inserted into a symbol mapping equation for the super-constellation symbols and is used to maintain a target power split between the two or more UEs, and
wherein p relates to unit constellation power and is applied to both a real part and an imaginary part of the symbol mapping equation for the super-constellation symbols.

2. The method of claim 1 , wherein determining which type of super-constellation to generate comprises:
determining whether to perform bit-swapping among the two or more UEs in the super-constellation.

3. The method of claim 1 , wherein determining which type of super-constellation to generate is also based on at least one of target throughput, target Block Error Rate (BLER), Modulation and Coding Scheme (MCS) of at least one of the two or more UEs, and the Multiple Input Multiple Output (MIMO) rank of at least one of the two or more UEs.

4. The method of claim 1 , wherein determining which type of super-constellation to generate comprises:
finding the type of super-constellation in a look-up table (LUT).

5. The method of claim 1 , wherein, when the GNC super-constellation is determined, generating the GNC super-constellation further comprises:
finding one or more parameters of the GNC super-constellation in a look-up table (LUT).

6. The method of claim 1 , wherein the values of p and q are constrained by the constituent constellations of the two or more UEs and a superposition environment of the super-constellation.

7. The method of claim 1 , wherein when p=q=1, distances between the super-constellation points are uniform.

8. The method of claim 1 , wherein, when the two or more UEs comprise a near UE with constellation modulation order N n and a far UE with constellation modulation order N f , a super-constellation modulation order is represented as:
N s =N n *N f ,
wherein the symbol mapping equation for super-constellation symbol x is represented as:
x={√{square root over (C)}/p [real part]+ j [imaginary part]}, j =√{square root over (−1)},

where C is a power constraint value.

9. The method of claim 1 , wherein, when the two or more UEs are a far and a near UE, both using Quaternary Phase Key Shifting (QPSK) modulation, the result is a 16-QAM (Quadrature Amplitude Modulation) super-constellation and the symbol mapping process can be represented as:

x
=

1

C

⁢

{

p
⁡

(

1
-

2
⁢

⁢

b
0

)

⁡

[

2
-

q
⁡

(

1
-

2
⁢

⁢

b
2

)

]

+

j
⁢

⁢

p
⁡

(

1
-

2
⁢

⁢

b
1

)

⁡

[

2
-

q
⁡

(

1
-

2
⁢

⁢

b
3

)

]

}

where C is a power constraint value.

10. The method of claim 1 , wherein the two or more UEs are

Assignees

• Samsung Electronics Co Ltd

Inventors

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

Classifications

• 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

• H04L5/003

  Arrangements for allocating sub-channels of the transmission path · CPC title

• H04L27/18

  Phase-modulated carrier systems, i.e. using phase-shift keying (H04L27/32 takes precedence) · CPC title

• H04L1/0003

  by switching between different modulation schemes · CPC title

• H04L1/007

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