High-Frequency Radio Link Conversion With PLL Distortion Control
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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 poles due to weather conditions causes signal degradation and distortion, especially in parabolic dish antennas that deviate from their perfect shape.
Innovation Solution
The implementation of a system using a base station with a first frequency converter and sector antennas, which employs a phase lock loop (PLL) to minimize non-linear distortions and convert signals from DOCSIS frequencies to higher frequencies like 70 or 80 gigahertz, while the customer premises equipment (CPE) uses high-gain antennas and frequency converters to maintain signal accuracy and stability.
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 applies preliminary action by performing frequency conversion in multiple staged steps rather than a single direct conversion. The signal is first converted to an intermediate frequency, then subsequently to the final high frequency, preventing error multiplication that would occur in direct conversion while still achieving the desired high-frequency transmission capacity
Solution Approach 2:
The patent uses an intermediate frequency as a mediator in the conversion process. This intermediate frequency acts as a buffer that allows the signal to be transformed gradually through multiple stages, reducing the stress on signal accuracy at each conversion step while still enabling high-frequency transmission
2Reliability
If the transceiver is positioned in front of the parabolic dish antenna, then the signal reception is improved, but movement of the pole causes displacement between transceiver and dish positions leading to signal degradation
Solution Approach 1:
The patent merges the transceiver and dish antenna into a single integrated assembly that moves together as one unit. This eliminates the relative displacement problem between transceiver and dish by ensuring they maintain fixed relative positions while the entire assembly moves in response to pole movement, thereby maintaining signal reception quality
3Ease 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 changes the operating parameters of the antenna system, specifically using higher frequency signals where the wavelength is small enough that minor surface deviations become negligible. This allows the use of simpler, easier-to-manufacture antenna surfaces while maintaining signal quality, as the relative error introduced by surface imperfections decreases at higher frequencies
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 significantly reduces error multiplication and signal distortions, ensuring high-frequency signal transmission with minimal errors and maintaining signal integrity despite antenna movement and shape deviations, thereby enhancing the accuracy and reliability of radio signal transmission.
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
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.