Universal Constellation Diagram for Interference Cancellation
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Solution Overview
Problem
Current interference cancellation technologies in wireless communication systems face challenges in dynamically signaling transmission parameters like modulation scheme and level, leading to significant overhead and performance degradation, especially in scenarios where UEs lack knowledge of interference modulation levels.
Innovation Solution
A universal constellation diagram is employed to enable interference cancellation without knowing the interference modulation level, using a low-complexity detection algorithm to calculate the Rank Indicator (RI) and Precoding Matrix Indicator (PMI), allowing UEs to blindly detect additional transmission parameters and cancel interference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dynamic signaling of transmission parameters (modulation scheme and level) is performed in units of slots or RBs, then interference cancellation performance is improved, but signaling overhead increases significantly
Solution Approach 1:
The patent applies universality by using a single constellation diagram that can represent multiple modulation schemes (QPSK, 16QAM, 64QAM, 256QAM) simultaneously. The constellation diagram points are designed to be compatible with different modulation levels, allowing the system to function across multiple modulation types without requiring separate signaling for each scheme, thereby reducing overhead while maintaining performance.
Solution Approach 2:
The patent changes the parameter representation by using constellation diagram point indices instead of traditional modulation scheme indicators. By mapping different modulation schemes to specific point selections within a universal constellation diagram, the system can dynamically adapt modulation parameters without requiring extensive signaling, thus reducing overhead while preserving interference cancellation effectiveness.
2Quantity of substance
If no signaling is used for transmission parameters, then signaling overhead is reduced, but performance degradation and computational cost increase significantly
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously determine interference parameters through blind detection using the universal constellation diagram. The UE can identify the interference modulation scheme and level by analyzing received signals against the universal constellation diagram without requiring network assistance or signaling, thus eliminating overhead while maintaining performance through self-powered parameter acquisition.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the universal constellation diagram that encompasses all possible modulation schemes. This pre-established structure allows the UE to perform efficient blind detection without real-time signaling, as the detection framework is already in place and optimized for rapid parameter identification, reducing both overhead and computational burden compared to exhaustive search methods.
3Quantity of substance
If blind detection of interference parameters is performed without a universal constellation diagram, then signaling overhead is reduced, but computational complexity increases due to the need to detect all parameters
Solution Approach 1:
The patent applies segmentation by dividing the interference parameter detection into two parts: the universal constellation diagram structure (which is pre-established and shared) and the specific parameter detection (which uses the diagram as a reference). This segmentation allows the UE to focus computational efforts only on determining which points in the universal diagram correspond to the actual interference parameters, rather than searching through all possible modulation configurations, thereby reducing computational complexity.
Solution Approach 2:
The universal constellation diagram serves as an intermediary between the received signal and the interference parameter determination. Instead of directly computing all possible parameter combinations, the UE uses the universal constellation diagram as a reference framework to guide the blind detection process, making the computational task more manageable by providing a structured search space rather than an unstructured exhaustive search.
Data Source
AI summary
Provided is an interference cancellation method by a User Equipment (UE) in a cellular communication system. The method includes receiving a signal including a desired signal and an interference signal from at least one base station; determining a universal constellation diagram based on at least one of a transmission parameter of the desired signal and a transmission parameter of the interference signal; blindly detecting an additional transmission parameter of the interference signal using the determined universal constellation diagram; and cancelling the interference signal from the received signal using the detected additional transmission parameter.