System and method for semi-orthogonal multiple access

Patent metadata

Field	Value
Publication number	US-9866364-B2
Application number	US-201514589676-A
Country	US
Kind code	B2
Filing date	Jan 5, 2015
Priority date	Aug 29, 2014
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

A method for operating a transmitting device using semi-orthogonal multiple access (SOMA) includes determining power allocations and sub-quadrature amplitude modulation (sub-QAM) allocations for a first receiving device and a second receiving device in accordance with channel information associated with the first receiving device and the second receiving device, and transmitting information about a first power allocation for the first receiving device, and a first sub-QAM allocation for the first receiving device to the first receiving device.

First claim

What is claimed is:

1. A method for operating a transmitting device using semi-orthogonal multiple access (SOMA), the method comprising:
determining, by the transmitting device, a first power allocation for a first receiving device, and a joint Gray code mapping in a composite quadrature amplitude modulation (QAM) constellation of signals for the first receiving device and a second receiving device, the composite QAM constellation comprising a first constellation map for the first receiving device and a second constellation map for the second receiving device;
selecting the composite QAM constellation out of a plurality of constellation maps in accordance with the first power allocation for the first receiving device and a second power allocation for the second receiving device; and
transmitting, by the transmitting device, information about the first power allocation for the first receiving device, and information about the first constellation map for the first receiving device, to the first receiving device, in accordance with the selected composite QAM constellation.

2. The method of claim 1 , further comprising determining coding rates for the first receiving device and the second receiving device in accordance with the first power allocation.

3. The method of claim 2 , wherein the information about the first power allocation includes information about the coding rates.

4. The method of claim 1 , wherein each map of the first and second constellation maps comprises one or more QAM layers and is a subset of a total number of QAM layers in the composite QAM constellation associated with the first receiving device and the second receiving device.

5. The method of claim 1 , wherein the first and second power allocations are performed jointly in accordance with channel information associated with the first receiving device and the second receiving device.

6. The method of claim 1 , further comprising transmitting information about the second constellation map for the second receiving device to the second receiving device.

7. The method of claim 1 , further comprising transmitting information about the second power allocation for the second receiving device and the second constellation map for the second receiving device to the second receiving device.

8. The method of claim 1 , wherein transmitting the information about the first power allocation and the information about the first constellation map comprises:
transmitting an indicator of the selected composite QAM constellation to the first receiving device.

9. The method of claim 1 , wherein the plurality of constellation maps comprises constellation maps with different inherent power offsets, and wherein selecting the composite QAM constellation comprises selecting the composite QAM constellation with an inherent power offset in accordance with a selection criterion.

10. The method of claim 9 , wherein the selection criterion comprises at least one of support for non-legacy constellation maps, receiving device compatibility, power offsets, the first and second power allocations, and signaling overhead constraints.

11. The method of claim 1 , wherein the plurality of constellation maps comprises legacy constellation maps specified by a technical standard.

12. The method of claim 1 , wherein the plurality of constellation maps comprises legacy constellation maps specified by a technical standard and non-legacy constellation maps with different inherent power offsets.

13. The method of claim 1 , further comprising:
deriving the first power allocation in accordance with channel information; and
determining coding rates in accordance with the channel information.

14. The method of claim 13 , wherein the channel information comprises a channel quality indicator (CQI).

15. The method of claim 1 , wherein a first channel between the transmitting device and the first receiving device has a high signal to noise ratio (SNR), and wherein a second channel between the transmitting device and the second receiving device has a low SNR.

16. The method of claim 1 , further comprising:
receiving channel information from the first receiving device and the second receiving device.

17. The method of claim 1 , further comprising:
receiving data for the first receiving device and the second receiving device;
encoding data for the first receiving device in accordance with a first coding rate for the first receiving device, thereby producing first encoded data;
encoding data for the second receiving device in accordance with a second coding rate for the second receiving device, thereby producing second encoded data;
modulating the first encoded data in accordance with the first constellation map for the first receiving device and the second encoded data in accordance with the second constellation map for the second receiving device, thereby producing a QAM symbol; and
transmitting the QAM symbol.

18. The method of claim 17 , wherein the QAM symbol is transmitted to the first receiving device and the second receiving device.

19. The method of claim 17 , wherein modulating the first encoded data in accordance with the first constellation map for the first receiving device and the second encoded data in accordance with the second constellation map for the second receiving device comprises:
generating the composite QAM constellation in accordance with the first power allocation, and the joint Gray code mapping in the composite QAM constellation; and
modulating the first encoded data and the second encoded data in accordance with the composite QAM constellation, thereby producing the QAM symbol.

20. The method of claim 1 , wherein the first power allocation is determined in accordance with channel information associated with the first and second receiving devices.

21. A transmitting device comprising:
a processor configured to:
determine a first power allocation for a first receiving device, and a joint Gray code mapping in a composite quadrature amplitude modulation (QAM) constellation of signals for the first receiving device and a second receiving device, the composite QAM constellation comprising a first constellation map for the first receiving device and a second constellation map for the second receiving device; and
select the composite QAM constellation out of a plurality of constellation maps in accordance with the first power allocation for the first receiving device and a second power allocation for the second receiving device; and

a transmitter operatively coupled to the processor, the transmitter configured to transmit information about the first power allocation for the first receiving device, and information about the first constellation map for the first receiving device, to the first receiving device, in accordance with the selected composite QAM constellation.

22. The transmitting device of claim 21 , wherein the processor is configured to determine coding rates for the first receiving device and the second receiving device in accordance with the first power allocation.

23. The transmitting device of claim 21 , wherein the transmitter is further configured to transmit information about the second constellation map for the second receiving device to the second receiving device.

24. The transmitting device of claim 21 , wherein the transmitter is configured to transmit information about the second power allocation for the second receiving device and the second constellation map for

Assignees

• Huawei Tech Co Ltd

Inventors

• Jia Ming
• Ma Jianglei
• Zhu Peiying
• Hu Hao

Classifications

• H04L27/34 Primary

  Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems · CPC title

• H04L1/0009

  by adapting the channel coding (H04L1/1812 takes precedence) · CPC title

• H04L2001/0093

  Point-to-multipoint · CPC title

• H04L1/0026

  Transmission of channel quality indication · CPC title

• H04L5/0003

  Two-dimensional division · CPC title