Superposition Modulation Aided Network Coding for Wireless Reliability
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving high reliability due to decreased signal power, uncontrollable interference, resource depletion, and protocol mismatches, particularly in Ultra Reliable Communication (URC) systems, where direct usage of extra resources for side information transmission degrades spectral efficiency.
Innovation Solution
The integration of superposition modulation with wireless physical network coding (WPNC) uses a composite constellation to embed side information within existing transmission resources, avoiding the need for additional resources and enhancing spectral efficiency while improving reliability through diversity and error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extra resources are used for side information transmission, then reliability is improved, but spectral efficiency deteriorates
Solution Approach 1:
The patent merges side information transmission with main data transmission by embedding side information into the same time-frequency resources using superposition modulation. The composite constellation combines primary constellation points (for main data) with side-information constellation points (for side information), allowing both to be transmitted simultaneously without requiring additional resources, thus resolving the contradiction between reliability improvement and spectral efficiency maintenance
Solution Approach 2:
The side information constellation is nested within the primary constellation structure. The side information symbols are superimposed on top of the main data symbols in the composite constellation, creating a nested hierarchical structure where side information is embedded within the existing transmission framework, enabling reliable side information delivery without consuming extra spectral resources
2Use of energy by moving object
If signal power is decreased, then energy efficiency is improved, but reliability deteriorates
Solution Approach 1:
The patent changes the power distribution parameter by introducing a power split factor that allocates different power levels to main data and side information within the composite constellation. By optimizing this parameter, the system achieves reliable side information transmission at lower overall power levels, resolving the contradiction between energy efficiency and reliability
Data Source
AI summary
Systems and methods described herein employ wireless physical network coding (WPNC) together with superposition modulation to support a highly reliable transmission. Embodiments include a composite constellation for carrying the side information that avoids use of extra resources. In additional embodiments, the MIMO, multi-stream transmission and multi-user superposition transmission (MUST) configurations are configured to utilize superposition modulation signaling.