RF Signal Distribution via Hybrid Modulation
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Solution Overview
Problem
Existing radio-frequency signal distribution systems lack independent control over signals and are limited by the maximum sampling frequency, restricting the use of a broad frequency band for simultaneous transmission across multiple operators and frequency bands.
Innovation Solution
A system utilizing a main unit with interface modules and combiner/separator modules, along with analogue modulation and multiplexing, allows for independent control and simultaneous transmission of multiple signals across different frequency bands and operators through optical fibre communication, enabling the use of a broad frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital transmission is used, then signal transmission is achieved, but the maximum sampling frequency limits the available bandwidth for signal transmission
Solution Approach 1:
The patent changes the transmission parameter from digital to hybrid (combining digital and analogue elements). The system uses digital signal processing at the main unit for control and signal preparation, then transitions to analogue modulation on the optical fibre for wideband transmission, and finally applies digital filtering at the remote unit. This parameter transformation allows the system to overcome the sampling frequency limitation of purely digital transmission while maintaining signal integrity through digital control.
2Adaptability or versatility
If analogue transmission is used, then broad frequency band transmission is enabled, but independent control of different signals is not possible
Solution Approach 1:
The patent segments the signal processing functions between the main unit and remote units. The main unit performs digital signal processing, filtering, and preparation for each operator and frequency band independently. The optical fibre carries the prepared signals to multiple remote units, each equipped with selective amplifiers that can independently control and amplify specific frequency bands and operators. This segmentation enables both broad frequency band utilization and independent signal control.
Solution Approach 2:
The system implements feedback mechanisms where the main unit receives information about signal conditions and can adjust transmission parameters. The remote units provide feedback on received signal quality and operational status, enabling the main unit to optimize signal distribution across different frequency bands and operators, thereby achieving independent control while maintaining broad bandwidth utilization.
3Adaptability or versatility
If multiple operators and frequency bands are transmitted simultaneously, then service coverage is improved, but signal interference and noise increase
Solution Approach 1:
The patent introduces optical fibre as an intermediary transmission medium between the main unit and remote units. The optical fibre carries signals with minimal interference, preserving signal quality over long distances. At the remote units, selective amplifiers act as intermediaries that can selectively amplify desired signals while rejecting unwanted frequencies and noise from other operators and frequency bands, thereby enabling multi-operator support while minimizing signal interference.
Solution Approach 2:
The system applies local quality control through selective amplifiers at each remote unit. Each amplifier is configured with specific frequency response characteristics tailored to the local requirements of particular operators and frequency bands. This allows optimal signal enhancement for each service while filtering out noise and interference from other services, enabling simultaneous transmission to multiple operators with maintained signal quality.
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 independent control of signals for each operator and frequency band, supports simultaneous transmission of multiple signals, and maintains high power levels at antennas by separate amplification, while reducing noise and allowing for pre-distortion and statistical signal analysis.
Implementation Method 1
The transmission of the optical signals between the main unit and the remote unit can be made both by means of a modulation of analogue type and by means of a modulation of digital type. In the first case, the intensity of the optical signal is modulated according to the electrical signal to be transmitted.
Implementation Method 2
The remote unit converts the optical signals received into corresponding electrical signals, which are then amplified and sent to a transmission antenna.
Data Source
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AI summary
The system (1) for the distribution of radio-frequency signals comprises a main unit (2) associated with at least a first radio communication set (A), at least a remote unit (3) associated with at least a second radio communication set (B) installed in a preset area, for the radio coverage of said area, and a communication channel (4) associated with the main unit (2) and with the remote unit (3), wherein the main unit (2) and the remote unit (3) have analogue modulation means (9, 10) of the signals to be sent on the communication channel (4). The remote unit (3) comprises at least a selective amplification unit (20) associated with the second radio communication set (B) and having analogue/digital conversion means (21, 22) of the signals coming from the main unit (2), through the communication channel (4), andlor of the signals coming from the second radio communication set (B), digital filtering means (23, 24) of the digital signals coming out of the analogue/digital conversion means (21, 22) and amplification means (27, 28) of the signals coming from the main unit (2), through the communication channel (4), and/or of the signals coming from the second radio communication set (B).