High-Frequency Radio Link Conversion With PLL Phase Stability
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Solution Overview
Problem
During the conversion of radio signals from lower frequencies to higher frequencies above 80 gigahertz, errors multiply rapidly, leading to significant inaccuracies, and movement of antenna and transceiver due to weather conditions causes signal degradation and distortion, especially in parabolic dish antennas that deviate from a perfect shape.
Innovation Solution
A system and method using a base station with a frequency converter and phase lock loop (PLL) to minimize non-linear distortions, converting DOCSIS standard frequencies to higher frequencies like 70 or 80 gigahertz, and employing high-gain antennas with the transceiver inside to maintain signal accuracy and stability, while the customer premises equipment (CPE) converts these high-frequency signals back to the original DOCSIS frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If radio signals are converted to frequencies much higher than the original DOCSIS frequency, then the transmission capacity and bandwidth are improved, but the error rate multiplies rapidly and accuracy deteriorates
Solution Approach 1:
The patent changes the frequency parameter through controlled conversion processes. It uses a first frequency converter to convert DOCSIS signals to high-frequency transport signals (70-80 GHz), and a second frequency converter to convert them back to baseband frequencies. This parameter transformation enables high-capacity transmission while maintaining accuracy through precise controlled conversion.
Solution Approach 2:
The patent employs phase-locked loops (PLL) in both frequency converters to provide feedback control. The PLLs continuously monitor and adjust the phase and frequency of the converted signals, detecting and correcting errors in real-time. This feedback mechanism prevents error multiplication during frequency conversion, maintaining signal accuracy despite the high frequency transformation.
2Ease of manufacture
If standard frequency conversion is used for DOCSIS signals, then the implementation is simple and cost-effective, but significant errors occur when converting to frequencies above 80 gigahertz
Solution Approach 1:
The patent segments the frequency conversion process into two distinct stages: first converting DOCSIS signals to high-frequency transport signals (70-80 GHz), then converting them back to baseband frequencies. This segmentation allows each conversion stage to be optimized independently, maintaining reliability while enabling high-frequency transmission capability.
Solution Approach 2:
The patent introduces high-frequency transport signals (70-80 GHz) as an intermediary carrier. Instead of directly converting DOCSIS signals to the final baseband frequencies, the system uses this intermediate high-frequency stage to enable high-capacity transmission, then converts back. This intermediary approach maintains signal integrity while achieving high transmission capacity.
3Measurement precision
If the transceiver is positioned in front of the parabolic dish antenna, then the signal reception is optimized, but movement of the pole due to weather causes displacement and signal degradation
Solution Approach 1:
The patent nests the transceiver unit inside the parabolic dish antenna structure. Instead of positioning the transceiver separately in front of the dish, it is integrated within the antenna housing. This nesting ensures that both components move together as a single unit, maintaining their relative positional relationship and preventing signal degradation from displacement.
4Ease of manufacture
If the parabolic dish antenna surface deviates from perfect shape, then manufacturing complexity is reduced, but signal distortions occur
Solution Approach 1:
The patent compensates for antenna surface imperfections by changing the electrical parameters through sophisticated signal processing algorithms. The system adjusts frequency, phase, and amplitude parameters of the transmitted and received signals to counteract the distortions caused by non-ideal antenna surfaces, maintaining signal quality despite manufacturing limitations.
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 minimizes error multiplication and signal distortions, maintaining high frequency modulation accuracy and stability by controlling phase noise and using low-noise amplifiers, and ensures signal integrity despite antenna movement and shape deviations.
Implementation Method 1
During the conversion, the first frequency converter may use a phase lock loop (PLL) to control a phase of the second radio signal
Implementation Method 2
The first frequency converter may be further configured to convert the first radio signal into a second radio signal. The second radio signal has a frequency higher than the predetermined frequency
Implementation Method 3
using low-noise amplifiers
Data Source
AI summary
Provided are systems and methods for transmitting radio signals. A system for transmitting radio signals includes a base station and a customer premises equipment (CPE). The base station includes a first frequency converter and at least one first antenna. The first frequency converter is configured to receive a first radio signal having a predetermined frequency and convert the first radio signal into a second radio signal. The second radio signal has a frequency higher than the predetermined frequency. The at least one first antenna has a transmitter and is configured to wirelessly transmit, via the transmitter, the second radio signal to the CPE. The CPE includes at least one second antenna configured to receive the second radio signal from the at least one first antenna and a second frequency converter configured to convert the second radio signal into the first radio signal.