Shared Transmission Parameter Allocation for Non-Orthogonal Multiplexing
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Solution Overview
Problem
Communication devices face difficulties in decoding data signals multiplexed using power allocation without knowing transmission parameters included in the multiplexed signal, particularly in non-orthogonal multiple access schemes like superposition coding.
Innovation Solution
An electronic device allocates and controls shared transmission parameters for signals with overlapping frequency or time resources, enabling appropriate decoding by determining and using these parameters for interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-orthogonal multiple access with superposition coding is used to increase cell communication capacity, then higher spectral efficiency is achieved, but signal interference between users increases making decoding difficult
Solution Approach 1:
The transmission device performs preliminary actions by allocating different power levels to different users' signals before multiplexing them. The reception device uses this power allocation information to perform successive interference cancellation, first decoding the high-power user's signal, then using it to cancel interference from the low-power user's signal, enabling reliable decoding of both signals despite their non-orthogonal multiplexing
Solution Approach 2:
The patent changes the power parameter of signals allocated to different users, creating a power difference that enables hierarchical decoding. By allocating higher power to certain users and lower power to others, the system transforms the interference problem into a solvable structure where high-power signals can be decoded first and used to cancel interference for low-power signals
2Reliability
If transmission parameters are allocated individually to each user signal, then decoding accuracy for each user is improved, but communication device complexity and processing load increase
Solution Approach 1:
The patent merges the power allocation parameter management into a unified scheme where the transmission device determines power levels for multiple users and the reception device uses these power levels for successive interference cancellation. This combining of power allocation and interference cancellation processes reduces the need for separate parameter management for each user while maintaining decoding accuracy
3Productivity
If power allocation is used to multiplex signals, then resource utilization efficiency is improved, but the reception device requires knowledge of other users' transmission parameters for successful decoding
Solution Approach 1:
The transmission device acts as an intermediary by determining and managing the power allocation parameters for all users. It provides power level information to reception devices, enabling them to perform successive interference cancellation without needing to independently know or estimate other users' transmission parameters. This intermediary role of the transmission device resolves the information asymmetry problem
Data Source
AI summary
A transmission device that: allocates at least partially shared transmission parameters to at least a subset of a plurality of signals to which resource blocks are allocated, the resource blocks having at least partially overlapping frequency resources or time resources; and controls a transmission process of the plurality of signals based on the shared transmission parameters.