Wireless UE DMRS Detection for MU-MIMO Interference Estimation
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Solution Overview
Problem
In Multi-User Multiple Input Multiple Output (MU-MIMO) scenarios, User Equipments (UEs) are not aware of co-scheduled neighboring UEs, leading to performance losses in channel estimation, Signal-to-Interference-Noise-Ratio (SINR) estimation, and interference control due to antenna array structures at the base station.
Innovation Solution
An electronic device detects the presence of co-scheduled neighboring devices through DMRS despread, performs channel estimation on serving and interference channels, calculates SNR and SINR, and decodes PDSCH data using these ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the MU-MIMO scenario is transparent to the UE (conventional approach), then the system maintains simplicity in UE design and operation, but the UE experiences performance loss in channel estimation, SINR estimation, and interference control
Solution Approach 1:
The UE autonomously detects the presence of co-scheduled neighboring UEs by processing DMRS signals and performs self-interference cancellation without requiring explicit network configuration or control signaling. The UE serves itself by independently identifying interference sources and applying cancellation techniques, thereby improving channel estimation performance while maintaining operational simplicity
Solution Approach 2:
The UE performs preliminary detection of co-scheduled neighboring UEs using DMRS signals before decoding PDSCH data. By identifying interference sources in advance through DMRS despread operations and channel estimation, the UE prepares interference cancellation parameters beforehand, which improves subsequent data decoding performance without adding complex real-time processing requirements
2Productivity
If the base station uses antenna array structure for MU-MIMO, then the network throughput is improved, but the UE cannot easily control interference from co-scheduled neighboring UEs
Solution Approach 1:
The DMRS signal serves as an intermediary that carries information about co-scheduled neighboring UEs. By processing the DMRS signals and extracting channel state information, the UE can identify interference sources and their characteristics without directly observing the complex antenna array structure at the base station, thereby simplifying interference control while maintaining high throughput
Solution Approach 2:
The patent replaces complex mechanical/physical interference control mechanisms (such as hardware-based interference rejection) with signal processing-based approaches. By using DMRS despread operations, channel estimation, and SINR calculation through software/algorithms, the UE achieves interference control without requiring complex hardware modifications, thus reducing device complexity while maintaining network throughput
Data Source
AI summary
An operating method of an electronic device, including: receiving a signal comprising a Demodulation Reference Signal (DMRS) and Physical Downlink Shared Channel (PDSCH) data; determining whether a co-scheduled neighboring electronic device is present, based on despread of the DMRS; performing channel estimation on each of a serving channel for the electronic device and an interference channel for a neighboring electronic device, based on the despread of the DMRS; calculating a variance of noise not including an interference signal, based on the co-scheduled neighboring electronic device; calculating a Signal-to-Noise-Ratio (SNR) for the DMRS and a Signal-to-Interference-Noise-Ratio (SINR) for the PDSCH data; and decoding the PDSCH data based on the SINR.