Distributed Antenna MIMO Signal Frequency Conversion
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Solution Overview
Problem
In distributed antenna systems, the inability to find unused frequency bands for MIMO signal transmission leads to transmission failures, particularly in multi-band systems where the number of available unused bands decreases as the number of frequency bands increases, causing interference and inefficiency.
Innovation Solution
A distributed antenna system that uses a master unit with a frequency converting unit to convert signals into predetermined frequencies for transmission over a single transmission line, eliminating the need to search for unused bands by combining and separating signals using oscillation frequencies, allowing simultaneous transmission and reception of MIMO signals without overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the master unit searches for unused frequency bands to transmit MIMO signals, then the MIMO signal transmission can be achieved, but the system fails when no unused bands are available, particularly in multi-band systems
Solution Approach 1:
The patent changes the frequency parameter of the first signal by converting it to a receive frequency (which is currently unused for transmission). This frequency conversion allows the system to utilize available frequency resources without requiring separate unused bands, thereby resolving the contradiction between transmission reliability and frequency band availability in multi-band systems
Solution Approach 2:
The system dynamically adjusts frequency allocation based on current usage conditions. By converting the first signal to a receive frequency that becomes temporarily available, the system adapts to changing frequency band availability conditions, ensuring MIMO transmission can proceed even when traditional unused bands are not available
2Productivity
If multiple frequency bands are serviced to increase system capacity, then more services can be provided, but the number of unused bands decreases making MIMO transmission more difficult
Solution Approach 1:
The patent applies frequency conversion to change the parameter of the first signal from its original transmit frequency to a receive frequency. This allows the system to maintain high service capacity across multiple bands while still finding available frequencies for MIMO transmission by utilizing the receive frequency band that is currently unused for transmission purposes
3Reliability
If the first signal and second signal are transmitted at their original frequencies, then signal integrity is maintained, but frequency overlap occurs preventing simultaneous transmission
Solution Approach 1:
The patent changes the frequency parameter of the first signal to a receive frequency, creating frequency separation between the first frequency conversion signal and the second signal. This allows both signals to be transmitted simultaneously through the same transmission line without overlap, while the remote unit can separate and process them independently, maintaining signal integrity while enabling simultaneous transmission
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
Enables reliable and efficient transmission and reception of MIMO signals between the master and remote units without requiring unused frequency bands, reducing interference and increasing system efficiency in multi-band environments.
Implementation Method 1
a frequency converting unit converting a frequency of a first signal received from a base station into a predetermined frequency to generate a first frequency conversion signal
Implementation Method 2
a local oscillating unit outputting a predetermined oscillation frequency signal
Implementation Method 3
a signal combining unit combining the first frequency conversion signal and a second signal received from the base station to generate a transmit signal
Data Source
AI summary
According to an aspect of the inventive concept, there is provided a master unit included in a distributed antenna system of a frequency division duplex scheme, includes: a frequency converting unit converting a frequency of a first signal received from a base station into a predetermined frequency to generate a first frequency conversion signal; a signal combining unit combining the first frequency conversion signal and a second signal received from the base station to generate a transmit signal; and a signal transmitting/receiving unit transmitting the transmit signal to a remote unit connected through a single transmission line.