DAS Control Unit Modulation for Multi-Frequency Coaxial Reuse
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Solution Overview
Problem
Conventional DAS systems require additional antenna infrastructure and substantial effort to support MIMO systems due to the need for parallel distributor paths and frequency range compatibility, limiting the reuse of existing coaxial cable networks for transmitting radio signals in different frequency ranges.
Innovation Solution
A control unit that recognizes available frequency ranges in an existing coaxial cable network using a voltage standing wave ratio method, allowing for modulation of radio signals to unoccupied frequencies, enabling the reuse of existing networks for transmitting signals in multiple frequency ranges, including those not originally configured for LTE or MIMO protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional DAS system uses parallel distributor paths and additional antenna infrastructure to support MIMO systems with multiple frequency ranges, then the system can transmit multiple radio signals simultaneously, but the device complexity and installation effort increase substantially
Solution Approach 1:
The patent combines multiple frequency range transmissions into a single distributor network path. The control unit consolidates the transmission of first radio signals (first frequency range) and second radio signals (second frequency range) through one shared distributor network, eliminating the need for parallel distributor paths while maintaining MIMO capability
Solution Approach 2:
The distributor network is designed to serve multiple functions by transmitting both first radio signals and modulated second radio signals through the same infrastructure. The control unit enables the single distributor network to handle multiple frequency ranges simultaneously, making the system more versatile without requiring additional dedicated paths
2Adaptability or versatility
If the distributor network is originally configured for a specific frequency range, then the installation is simpler and more reliable, but it cannot transmit radio signals in other frequency ranges
Solution Approach 1:
The patent changes the frequency parameter of the second radio signals through modulation. The control unit modulates the second radio signals from their original second frequency range to a third frequency range that is suitable for transmission through the distributor network originally configured for the first frequency range, enabling frequency range adaptability while maintaining reliable transmission
3Productivity
If additional distributor paths are installed to support LTE MIMO systems, then the system can handle broad-band requirements, but the installation effort and cost increase substantially
Solution Approach 1:
The patent merges the transmission of multiple broad-band signals into a single distributor network path. By using the control unit to manage and modulate signals from different frequency ranges, the system achieves LTE MIMO capability without requiring separate parallel distributor paths, substantially reducing installation effort
Solution Approach 2:
The existing distributor network serves itself by being reused for multiple frequency ranges. The control unit enables the original distributor network to handle additional signals without requiring new infrastructure, making the system self-sufficient and eliminating the need for extensive additional installations
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 the efficient use of existing coaxial cable networks for transmitting radio signals in multiple frequency ranges, reducing the need for additional infrastructure and minimizing interference, while allowing for flexible configuration to support various mobile communication protocols like GSM, UMTS, LTE, and LTE-MIMO.
Implementation Method 1
The sensor is so configured to capture details of a usable signal spectrum on the distributor network by means of a voltage standing wave ratio measuring method
Implementation Method 2
A modulator in the control unit converts (or modulates) the second radio signals from the second frequency range to a further frequency range
Data Source
Figure 1~2
Figure 3
Figure 4A
AI summary
A DAS system (10) for sending and receiving radio signals in several frequency ranges is described. The system comprises a control unit (30) with at least one first port (30-1) for forwarding first radio signals (20-1) in a first frequency range and one second port (30-2) for forwarding second radio signals (20-2) in a second frequency range. A plurality of remote units (50) are connected to the control unit (30) via a distributor network (40). The remote units (50) have first antenna elements (50-1) for sending and receiving the radio signals (20-1) in the first frequency range and second antenna elements (50-2) for sending and receiving the radio signals (20-2) in the second frequency range. The control unit (30) comprises a modulator (34) for converting the second radio signals (20-2) to a further frequency range and the remote units (50) have a demodulator (54) for converting the second radio signals (20-2) from the further frequency range to a different frequency range.