Sliding Window Superposition Coding MIMO for 5G Interference Mitigation
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Solution Overview
Problem
In 5G wireless communication systems, cell edge UEs experience performance degradation due to interference from neighbor cells, and existing interference mitigation schemes like IASD and NAICS have limitations in achieving theoretical maximum data rates and complexity.
Innovation Solution
The implementation of a sliding window superposition coding (SWSC) multi-input multi-output (MIMO) scheme that adapts modulation and coding schemes based on achievable rate regions, using precoding matrices to optimize signal transmission and reception, thereby reducing interference and increasing spectrum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interference mitigation schemes (IASD, NAICS) are used, then cell edge UE performance is improved, but theoretical maximum data rates are not achieved and system complexity increases
Solution Approach 1:
The patent combines superposition coding and MIMO techniques into a unified SWSC-MIMO scheme, merging interference mitigation with spatial processing to achieve both performance improvement and theoretical maximum data rates without excessive complexity
Solution Approach 2:
The system dynamically adjusts modulation and coding schemes based on achievable rate regions calculated from channel matrices, changing operational parameters adaptively to optimize performance while managing complexity through structured parameter space exploration
2Object-affected harmful factors
If cell size is reduced, then interference between cells is reduced, but cell edge UE throughput decreases
Solution Approach 1:
The patent introduces superposition coding as an intermediary technique that allows multiple signals to share the same time-frequency resource, with the base station coordinating transmissions to ensure cell edge UEs can reliably decode intended signals even in the presence of overlapping signals from neighbor cells
Solution Approach 2:
The system transitions from traditional single-user per-time-resource allocation to multi-user superposition coding, adding a new dimension of signal layering that enables multiple UEs to be served simultaneously in the same cell, thereby maintaining throughput despite reduced cell size
3Productivity
If advanced coding modulation schemes (FQAM, SWSC) are used, then data rates are improved, but system complexity increases
Solution Approach 1:
The patent segments the coding modulation process into distinct superposition coding layers and MIMO spatial layers, allowing independent optimization and simplifying the implementation by breaking down the complex SWSC-MIMO scheme into manageable processing stages
Data Source
AI summary
The present disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-generation (4G) communication system such as a long term evolution (LTE). An operating method of a transmitting apparatus in a wireless communication system is provided. The operating method includes detecting an achievable rate region for a receiving apparatus, and determining a modulation and coding scheme (MCS) level and a sliding window superposition coding (SWSC) multi-input multi-output (MIMO) scheme corresponding to the achievable rate region.