Apparatus and method for superposition transmissions

Patent metadata

Field	Value
Publication number	US-2016366003-A1
Application number	US-201614997106-A
Country	US
Kind code	A1
Filing date	Jan 15, 2016
Priority date	Jun 9, 2015
Publication date	Dec 15, 2016
Grant date	—

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 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 the GNC super-constellation itself are Gray-mapped, and generating the determined type of superposition constellation.

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 a GNC super-constellation is determined, generating the GNC super-constellation comprises:
finding one or more parameters of the GNC super-constellation in a look-up table (LUT).

6 . The method of claim 1 , wherein generating a GNC super-constellation comprises:
mapping the GNC super-constellation from outermost bits to innermost bits according to each of K number of UEs.

7 . The method of claim 6 , wherein, if each of the K UEs use Quaternary Phase Key Shifting (QPSK) modulation for their single-user constellations, mapping the GNC super-constellation can be represented by the following equation:
( b 0 ,b 1 ,b 2 ,b 3 , . . . ,b 2k-2 ,b 2K-2 )=( b 0 ,b 1 )⊕( b 2 ,b 3 ) . . . ⊕( b 2K-2 ,b 2K-1 )
where (b 0 , b 1 ) are the two bits for a first UE user and the outermost bits, (b 2 , b 3 ) are the two bits for a second UE, and so on until (b 2K-2 , b 2K-1 ), the two bits for the Kth UE and the innermost bits.

8 . The method of claim 1 , wherein generating a GNC super-constellation comprises:
mapping symbols in accordance with parameters p and q, which are positive real-valued numbers, where q guarantees the desired power split between the UEs and p relates to unit constellation power.

9 . The method of claim 8 , wherein, when the two or more UEs are a near UE with constellation modulation order N n and a far UE with constellation modulation order N f , the super-constellation is N s =N n *N f , the real part of the analytical form of the linear combination can be represented as a factor for power normalization and a preceding (1−2b 2 ) which is multiplied by a repeating nested structure, where the repeating nested structure may be represented by:

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10 . The method of claim 8 , 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:

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Assignees

• Samsung Electronics Co Ltd

Inventors

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

Classifications

• H04L27/18

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

• H04L1/0016

  involving special memory structures, e.g. look-up tables · 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