Resource Mapping Mode for Interference Cancellation in Wireless Systems
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Solution Overview
Problem
Current resource mapping methods in wireless communication systems, particularly in superposition transmission, lead to signal collisions that impair transmission performance and increase complexity for multi-user detection and interference cancellation algorithms, affecting system capacity and bit error rates.
Innovation Solution
A fixed resource mapping mode within specific time-frequency resource ranges, where multiple terminals use consistent mapping patterns across resource blocks, reducing complexity and improving performance by evenly distributing modulation symbols, thus enhancing the effectiveness of multi-user detection, channel decoding, and interference cancellation algorithms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If superposition transmission is used to increase system capacity, then more terminals can share the same radio resource, but signal collision between terminals occurs which impairs transmission performance
Solution Approach 1:
The resource blocks are segmented into multiple resource element groups (REGs), and modulation symbols are mapped to different REGs based on terminal identification information. This segmentation allows different terminals to use different mapping patterns, reducing signal collision while maintaining system capacity.
Solution Approach 2:
Different resource mapping patterns are applied to different terminals based on their identification information. Each terminal experiences a locally optimized mapping pattern that reduces its specific collision scenarios, while the overall system maintains high capacity through superposition transmission.
2Productivity
If MUD algorithm and IC algorithm are used to eliminate interference, then total system capacity can be increased, but receiver complexity increases significantly
Solution Approach 1:
The resource mapping pattern is designed in advance to promote even collision distribution before reception. By pre-configuring the mapping based on terminal ID, the system reduces the complexity burden on the receiver's MUD and IC algorithms, as the collision pattern is more predictable and manageable.
Solution Approach 2:
The mapping pattern parameters are changed based on terminal identification information, creating different mapping configurations for different terminals. This parameter variation reduces the complexity of interference cancellation by making the collision structure more regular and easier to process.
3Ease of operation
If current resource mapping manner is used, then terminals can transmit signals, but collision manner is not optimal for MUD, channel decoding, and IC algorithms affecting system capacity and bit error rate
Solution Approach 1:
Different resource mapping patterns are applied to different terminals based on their identification information. This local optimization ensures that each terminal's mapping is tailored to reduce its specific collision scenarios, improving bit error rate performance while maintaining transmission capability.
Solution Approach 2:
The resource mapping pattern is dynamically selected based on terminal identification information. This dynamic adaptation allows the system to optimize the mapping pattern for each terminal's specific situation, reducing collisions and improving detection performance without compromising transmission flexibility.
Data Source
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AI summary
A resource mapping method and apparatus and a resource mapping indication method and apparatus are provided to adapt to an interference cancellation function of a receiver. The method is: A network device obtains a mapping mode used for resource mapping during uplink transmission. The network device sends, to a terminal, information indicating the mapping mode. The mapping mode is used to indicate mapping locations of a plurality of modulation symbols in a resource mapping block RMB, the RMB comprises a plurality of resource elements REs, and at least one RE carries at least two modulation symbols.