UE-Specific Codebook for MM-Based NOMA
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing the complexity of decoding and interference in multiuser superposition transmission, particularly in massive machine-type communication scenarios, where high connection density and low latency requirements are stringent.
Innovation Solution
The use of UE-specific codebooks in multi-dimensional modulation (MM) based non-orthogonal multiple access (NOMA) communication systems, which involves designing optimized codebooks to minimize interference and improve decoding performance through techniques like bipartite matching and Euclidean distance maximization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiuser superposition transmission is used to increase connection density, then the number of simultaneous connections is improved, but decoding complexity increases
Solution Approach 1:
The patent segments the codebook into user-specific subsets, where each user is assigned a specific codebook subset. This segmentation allows the receiver to perform decoding only within the assigned subset rather than the entire codebook, significantly reducing decoding complexity while maintaining support for multiple simultaneous connections through codebook-based non-orthogonal multiple access
Solution Approach 2:
The patent introduces a new dimension of codebook indexing by assigning different codebook subsets to different users. This dimensional separation in the codebook space enables multiple users to share the transmission medium simultaneously with reduced interference, increasing connection density without proportionally increasing decoding complexity
2Quantity of substance
If multiuser superposition transmission is used to increase connection density, then the transmission capacity is improved, but interference between users increases
Solution Approach 1:
The patent applies local quality by assigning different codebook subsets to different users, creating user-specific local characteristics in the codebook space. This differentiation ensures that each user's signal has distinct properties, reducing mutual interference while allowing high transmission capacity through superposition of multiple user signals
Solution Approach 2:
The patent introduces asymmetry in the codebook structure by creating unequal or differently structured codebook subsets for different users. This asymmetric design optimizes the separation between user signals, minimizing interference while maximizing the overall transmission capacity of the system
3Reliability
If UE-specific codebooks are designed to reduce interference, then communication performance is improved, but system complexity increases
Solution Approach 1:
The patent achieves universality by designing a codebook structure that serves multiple functions: it provides user-specific differentiation for interference reduction, enables efficient decoding through subset assignment, and supports flexible resource allocation. This multi-functional codebook design improves communication performance without requiring separate mechanisms for each function, thereby limiting the increase in system complexity
Data Source
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AI summary
A method by which a terminal performs a multi-dimensional modulation (MM)-based non-orthogonal multiple access (NOMA) communication can comprise the steps of: receiving, from a base station, control information indicating a terminal specific codebook for a terminal in a predefined codebook set for an MM-based encoder; and receiving a downlink data channel from the base station on the basis of the indicated terminal specific codebook, or performing MM-based encoding on the basis of the indicated terminal specific codebook and then transmitting an uplink data channel.