MIMO Relay Apparatus Gain Control for Line-of-Sight Signal Detection
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Solution Overview
Problem
In line-of-sight environments, the MIMO scheme faces challenges in signal detection due to significant differences in power levels between direct and relayed waves, making it difficult for receivers to effectively combine these signals for improved throughput.
Innovation Solution
A relay apparatus that determines and adjusts the amplification gain based on the geographical positional relationship among the transmitter, relay apparatus, and receiver to equalize the reception levels of direct and relayed waves, facilitating signal detection by amplifying the relayed wave to match the direct wave's power level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relay apparatus transmits the relayed wave with fixed amplification gain, then the relayed wave can be transmitted to the receiver, but the reception level of the relayed wave differs significantly from that of the direct wave, making signal detection difficult
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the amplification gain of the relay apparatus based on the reception levels of direct and relayed waves. The gain control unit modifies the amplification gain to equalize the reception levels, transforming the fixed parameter into a variable one that adapts to changing channel conditions, thereby resolving the contradiction between reliable signal detection and ease of signal combination
Solution Approach 2:
The patent implements feedback mechanisms where the receiver measures the reception levels of both direct and relayed waves and feeds this information back to the relay apparatus. The relay apparatus uses this feedback to adjust its amplification gain, creating a closed-loop control system that continuously optimizes the relayed wave strength to match the direct wave, thus improving both signal detection reliability and combination ease
2Adaptability or versatility
If the relay apparatus is installed to complicate radio propagation paths, then signal detection should be facilitated in line-of-sight environments, but the reception levels of direct and relayed waves become significantly different, making effective signal combination difficult
Solution Approach 1:
The patent uses parameter changes by adjusting the amplification gain of the relay apparatus according to the specific propagation conditions. In line-of-sight environments where the relayed wave may be weaker due to longer path length, the system increases the amplification gain to compensate, thereby maintaining balanced reception levels and enabling effective signal combination while preserving adaptability to different environment types
Solution Approach 2:
The patent applies dynamics by making the amplification gain dynamic rather than fixed. The gain control unit continuously adjusts the amplification parameter based on real-time measurements of direct and relayed wave reception levels, allowing the system to adapt to varying propagation conditions including line-of-sight environments, thus maintaining reception level balance across different scenarios
Data Source
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AI summary
A relay apparatus is disclosed for relaying a signal from a transmitter to a receiver in a MIMO (Multiple Input Multiple Output) based communication system, comprising: a power difference determination unit configured to determine a difference of reception levels between a direct wave and a relayed wave based on positional relationship among the transmitter, the relay apparatus and the receiver, the direct wave traveling from the transmitter to the receiver without the relay apparatus, the relayed wave traveling from the transmitter to the receiver via the relay apparatus; a gain determination unit configured to determine an amplification gain of the relay apparatus to make the difference smaller; and a transmitting unit configured to amplify the signal from the transmitter at the determined amplification gain and transmit the amplified signal to the receiver.