Repeater Frequency Conversion for MIMO Signal Decoupling
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Solution Overview
Problem
Current communication networks face limitations in transmission capacity due to limited bandwidth and inefficient utilization of frequency resources, particularly in outdoor areas where the correlation of communication signals restricts the effectiveness of MIMO technology.
Innovation Solution
The integration of a test receiver and converting device in the repeater system allows for cognitive frequency conversion of communication signals, utilizing unused frequency ranges outside the traditional mobile radio bands, enabling the transmission of MIMO signals across multiple frequencies to increase transmission capacity without requiring cognitive terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO technology is used to increase transmission capacity, then data throughput is improved, but signal correlation in outdoor areas limits effectiveness
Solution Approach 1:
The patent applies frequency conversion to change the frequency parameter of MIMO signals. By converting signals to different frequency ranges, the system exploits frequency diversity to reduce signal correlation in outdoor areas, thereby maintaining the transmission capacity benefits of MIMO while overcoming the correlation limitation.
2Productivity
If frequency conversion is performed to utilize unused frequency ranges, then transmission capacity is increased, but device complexity increases
Solution Approach 1:
The patent introduces a converting device as an intermediary component in the repeater system. This dedicated frequency conversion module handles the complex signal processing tasks, allowing the rest of the repeater system to remain relatively simple while still achieving increased transmission capacity through frequency diversity.
3Reliability
If Doppler shift is compensated to maintain signal quality, then communication reliability is improved, but transmission capacity is reduced
Solution Approach 1:
The patent uses frequency conversion to proactively manage Doppler shift effects by transitioning signals to different frequency ranges where Doppler impacts are reduced. This parameter change approach maintains signal quality without requiring complex real-time Doppler compensation that would limit transmission capacity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances transmission capacity by decoupling MIMO signals, overcoming the limitations of signal correlation and Doppler shift, and allowing for efficient data throughput even in mobile umbrella cells, while avoiding the need for cognitive terminals and additional infrastructure.
Implementation Method 1
a converting device for frequency conversion of at least one information channel passed through
Data Source
AI summary
In one embodiment, a repeater for wireless communication is provided. The repeater comprises: circuitry configured to receive first and second MIMO-coded information channels at a first frequency; a converting device configured to convert the first MIMO-coded information channel to a second frequency using information from a test receiver configured to determine unused frequency ranges situated outside frequency bands allocated to mobile radio for wireless communication, the test receiver communicatively coupled with the converting device, the converting device configured to convert the first MIMO-coded information channel to the second frequency in at least one communication direction, the second frequency within the unused frequency ranges situated outside the frequency bands allocated to mobile radio; and circuitry configured to transmit the first and second MIMO-coded information channels in the at least one communication direction, wherein the first and second MIMO-coded information channels are transmitted using different frequencies compared to each other.