Relay Station Delay Diversity for Low-Latency 5G Coverage
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Solution Overview
Problem
In 5G wireless communication systems, achieving ultra-low delay and expanding cell coverage through relay stations is challenging, particularly in obtaining a sufficient diversity effect at the terminal station due to high correlation between radio signal propagation characteristics among relay station antennas and between the base station and relay station.
Innovation Solution
A relay station with multiple antennas and finite impulse response (FIR) filters is used to assign different delays to baseband signals, implementing non-regenerative relay and achieving delay diversity for radio signals transmitted from multiple antennas, thereby improving the diversity gain at the terminal station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If non-regenerative relay is used to reduce delay, then transmission delay is reduced, but diversity effect at the reception station deteriorates due to high correlation between propagation characteristics
Solution Approach 1:
The patent changes the time domain parameter by assigning different delay amounts to signals from different antennas. The controller sets different delay amounts in the FIR filters of different wireless devices, transforming signals with identical propagation characteristics into signals with different arrival times at the reception station, thereby creating artificial delay diversity without regenerative processing
Solution Approach 2:
The patent introduces dynamic delay adjustment through FIR filters controlled by a controller. The delay amounts are dynamically set to compensate for propagation path differences and create diversity, making the relay system adaptive to varying channel conditions while maintaining non-regenerative operation
2Area of stationary object
If multiple antennas are used at the relay station, then coverage area is expanded, but diversity gain at the terminal station is insufficient due to high correlation between antenna propagation characteristics
Solution Approach 1:
The patent applies parameter changes in the time domain by assigning different delay amounts to signals from different antennas. This transforms the spatially correlated signals into temporally diverse signals at the reception station, enabling diversity gain while maintaining multiple antenna coverage expansion
Data Source
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AI summary
A relay station (3) comprises antennas (#0, #1), wireless devices (31) corresponding to the antennas, and a controller (32) to control an operation of the wireless devices. Each of the wireless devices (31) includes a receiver to convert the first radio signal received by a corresponding antenna into a baseband signal, an FIR filter to assign a delay to the baseband signal; and a transmitter to convert a signal output from the FIR filter into a second radio signal transmitted from the corresponding antenna to the reception station (2, 4). The controller (32) sets a different delay amount in the FIR filter in each of the wireless devices (31) so that the FIR filter assigns a delay, which is different from among the antennas, to the baseband signal input from the receiver in each of the wireless devices (31).