Relay Station FIR Delay Control for Non-Regenerative Diversity
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Solution Overview
Problem
In wireless communications, particularly in 5G systems, achieving sufficient diversity effect is hindered by high correlation between propagation characteristics of radio signals received from relay stations and the base station, limiting the effectiveness of transmission diversity when using non-regenerative relay with a reception station having one antenna.
Innovation Solution
Implementing a relay station with multiple antennas that apply different delays to radio signals using FIR filters, ensuring each relay station's signal transmission has a distinct delay, thereby achieving delay diversity and enhancing diversity gain at the reception station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If non-regenerative relay is used with a relay station having one antenna, then communication delay is reduced, but diversity effect is insufficient due to high correlation between propagation characteristics
Solution Approach 1:
The relay station is divided into multiple antenna elements (first antenna and second antenna), each capable of independently receiving and relaying signals. This segmentation allows the system to exploit spatial diversity by transmitting signals through different physical paths via separate antennas, thereby reducing correlation between propagation characteristics while maintaining non-regenerative relay operation.
Solution Approach 2:
The patent introduces a time dimension by applying different delays to signals transmitted through different antennas. The controller delays the signal from the first antenna differently than the signal from the second antenna, creating temporal separation in addition to spatial separation. This dimensional expansion further reduces signal correlation and enhances diversity effect at the reception station.
2Area of stationary object
If multiple relay stations are used without delay differentiation, then coverage area is expanded, but signal correlation remains high reducing diversity gain
Solution Approach 1:
Each relay station is configured with distinct delay characteristics tailored to its specific location and propagation path. The controller at each relay station applies unique delay amounts to signals transmitted through different antennas, creating locally optimized signal characteristics that reduce correlation with other relay stations' signals. This local differentiation enhances overall system diversity while maintaining expanded coverage.
3Device complexity
If same delay is applied to all antennas in relay stations, then signal transmission is simplified, but diversity effect at reception station is limited
Solution Approach 1:
The delay configuration is made dynamic rather than static. The controller dynamically adjusts and differentiates delay amounts assigned to signals from different antennas based on actual propagation conditions and system requirements. This dynamic differentiation maximizes diversity effect while maintaining manageable system complexity through intelligent control rather than complex hardware modifications.
Data Source
AI summary
A first relay station capable of performing, together with a second relay station, a non-replay relay for a first radio signal transmitted from a transmitting station for a receiving station having one antenna includes an antenna, a radio and a controller. The radio includes a receiver that converts the first radio signal into a baseband signal, an FIR filter that adds a delay to the baseband signal, and a transmitter that converts the signal output from the FIR filter into a second radio signal transmitted from the antenna to the receiving station. The controller ensures that the second radio signals transmitted from the respective antennas of the first and second relay stations have different delays, and that the FIR filter The delay is set in the FIR filter.