Non-orthogonal Multiple Access NOMA Multi-stage Sequence Generation
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Solution Overview
Problem
Current non-orthogonal multiple access (NOMA) schemes for 5G wireless communications face challenges in reducing multi-user interference and improving performance, particularly in differentiating user equipment (UEs) and managing resource allocation effectively.
Innovation Solution
The proposed solutions include Group Orthogonal Coded Access (GOCA) using multi-stage sequence generation, Repetition Division Multiple Access (RDMA) with varying repetition patterns, and Low-Density Spreading (LDS) patterns to reduce multi-user interference and enhance performance by optimizing data encoding and resource allocation in shared time and frequency resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If resource spreading multiple access (RSMA) is used to differentiate multiple UEs by scrambling sequences, then sequence generation is simple, but performance is relatively poor
Solution Approach 1:
The patent segments the scrambling sequence generation into multiple stages: a first-stage group-specific scrambling sequence and a second-stage user-specific scrambling sequence. This segmentation allows simple sequence generation while improving performance through multi-layer differentiation of UEs.
2Reliability
If interleave division multiple access (IDMA) is used to differentiate multiple UEs by interleave patterns, then diversity utilization is improved, but system complexity increases
Solution Approach 1:
The patent divides the interleaving process into two stages: a first-stage group-specific interleaver and a second-stage user-specific interleaver. This segmentation achieves better diversity utilization while managing system complexity through hierarchical structure.
3Adaptability or versatility
If interleaved-grid multiple access (IGMA) is used to differentiate multiple UEs by bit-level interleavers and grid mapping patterns, then system flexibility is improved, but system complexity increases
Solution Approach 1:
The patent implements a two-stage scrambling and interleaving process that provides flexible differentiation of UEs through group-specific and user-specific parameters, achieving system flexibility while controlling complexity through hierarchical design.
Solution Approach 2:
The patent introduces a group dimension in addition to the user dimension, creating a two-dimensional differentiation structure. This allows flexible system configuration through group-specific parameters while maintaining manageable complexity through the hierarchical approach.
4Productivity
If conventional NOMA schemes are used for uplink transmissions, then multi-user access is enabled, but multi-user interference is not effectively reduced
Solution Approach 1:
The patent segments the multiple access process into group-specific and user-specific stages, enabling effective multi-user access while reducing multi-user interference through hierarchical differentiation and structured resource allocation.
Data Source
AI summary
Various novel concepts and schemes pertaining to non-orthogonal multiple access for wireless communications are described. A group orthogonal coded access (GOCA) scheme is introduced to reduce multi-user interference (MUI) and improve performance. A repetition division multiple access (RDMA) scheme is introduced to differentiate user equipment (UEs) by different repetition patterns. A low-density spreading (LDS) scheme is introduced to reduce MUI and improve performance.