Modulation Mapping Table for Non-Orthogonal Multiplexing

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Hierarchical modulation in non-orthogonal multiplexing for multiple users requires flexible power allocation, which is inflexible and complicates the implementation of downlink channel capacity.

Innovation Solution

A modulating method and apparatus that uses a mapping table to determine correspondence between information bits and modulated symbols, applying techniques like BPSK, QPSK, and QAM, and linear superposition of modulated symbols with power factors to simplify non-orthogonal multiplexing, allowing efficient transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If hierarchical modulation is applied for non-orthogonal multiplexing of multiple users, then transmission capacity is improved, but power allocation becomes inflexible and implementation complexity increases

Engineering Contradiction:

Improvetransmission capacityVSAvoidimplementation complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The information bits are segmented into multiple groups, where each group is independently mapped to modulated symbols through separate mapping tables. This segmentation allows flexible power allocation for different user groups while maintaining simplified modulation processes, resolving the contradiction between transmission capacity and implementation complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Mapping tables are pre-configured to define the correspondence between information bits and modulated symbols. This preliminary action simplifies the real-time modulation process by replacing complex calculations with table lookups, thereby reducing implementation complexity while maintaining high transmission capacity.

Inventive Principle:

Principle #10Preliminary action

2Quantity of substance

If hierarchical modulation is applied for non-orthogonal multiplexing, then downlink channel capacity approaches the capacity limit, but power allocation flexibility is reduced

Engineering Contradiction:

Improvedownlink channel capacityVSAvoidpower allocation flexibility

Core Design Contradiction:

Quantity of substanceVSAdaptability or versatility

Solution Approach 1:

The system dynamically selects different mapping tables based on channel conditions and user requirements. Each mapping table corresponds to different power allocation scenarios, enabling the system to adapt power allocation flexibly while maintaining downlink channel capacity close to the capacity limit.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

Different mapping tables are used to change the mapping parameters between information bits and modulated symbols. This allows the system to adjust power allocation parameters dynamically, achieving both high downlink channel capacity and flexible power allocation adaptability.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10404504B2Modulation method, demodulation method, and apparatus for multi-user information transmission

Publication Date: 2019.09.03 ZTE CORP

AI summary

Disclosed are a modulation method, demodulation method, and apparatus for multi-user information transmission. The modulation method comprises: a transmitter determines a first modulation symbol and a second modulation symbol according to a first information bit, a second information bit, and a mapping table, the mapping table being used for determining a corresponding relation between the first information bit and the first modulation symbol and a corresponding relation between the second information bit and the second modulation symbol, each group of modulation symbols in the mapping table being superposed and mapped to a constellation diagram to achieve a Gray attribute; and the transmitter superposes the first modulation symbol and the second modulation symbol to obtain a superposed symbol.