Multi-Antenna Relay SINR Estimation for Stable Non-Regenerative Relay
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Solution Overview
Problem
Existing radio communication systems face challenges in providing stable, ultra-low-latency communication through relay stations, particularly in non-regenerative relays where antenna selection affects communication quality without demodulation or decoding.
Innovation Solution
A relay station with multiple antennas estimates Signal-to-Interference-and-Noise-Ratio (SINR) to determine optimal reception and transmission antennas based on propagation characteristics, noise, and interference power, enabling stable communication without feedback from the reception station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-regenerative relay is used to reduce latency and processing load, then communication speed and efficiency are improved, but communication stability deteriorates due to inability to perform signal optimization
Solution Approach 1:
The relay station performs preliminary SINR estimation and antenna selection based on pre-acquired propagation characteristics before actual signal relay. This allows the system to pre-determine the optimal antenna combination (first antenna for reception, second antenna for transmission) without needing to process or optimize the signal itself, maintaining non-regenerative relay benefits while ensuring communication stability through advance planning
Solution Approach 2:
The relay station autonomously selects its own transmission and reception antennas by estimating SINR using pre-acquired propagation characteristics and noise/interference power information. This self-service mechanism eliminates the need for feedback from the reception station while maintaining optimal communication performance through local decision-making
2Reliability
If multiple antennas are provided at the relay station to improve communication quality, then signal reliability is improved, but device complexity increases
Solution Approach 1:
The system manages multiple antennas by dynamically changing operational parameters (which antenna is used for transmission, which for reception) based on SINR estimation. Instead of physically reconfiguring the antenna system, the relay station selects from pre-defined antenna combinations using propagation characteristics and noise power information, maintaining signal reliability while avoiding complex physical reconfiguration mechanisms
3Productivity
If antenna selection is performed without feedback from reception station to reduce processing load, then productivity is improved, but measurement precision deteriorates
Solution Approach 1:
Propagation characteristics between the relay station and both transmission/reception stations are acquired in advance through separate measurement processes. This preliminary action allows the relay station to perform accurate SINR estimation using pre-known channel conditions without needing real-time feedback, maintaining measurement precision while improving processing efficiency
Solution Approach 2:
The system uses implicit feedback through pre-acquired propagation characteristics and noise power information. Instead of requiring explicit feedback loops, the relay station makes informed decisions based on previously measured channel conditions, achieving accurate SINR estimation without the overhead of continuous feedback communication
Data Source
AI summary
A relay station includes a plurality of antennas and a controller. In non-regenerative relay of a first signal, the controller estimates an SINR of the first signal at a reception station after the relay on the basis of a transmit power of the first signal at a transmission station, first propagation characteristics between one or more first antennas set as reception antennas for the first signal and the transmission station, second propagation characteristics between one or more second antennas set as transmission antennas for the first signal after the relay and the reception station, a noise power and an interference power at the relay station, and a noise power at the reception station, and determines the first antennas and the second antennas in a combination that makes the SINR of the first signal at the reception station maximum respectively as the reception antennas and the transmission antennas.