Phase Noise Suppression in Microwave Backhaul Links
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Solution Overview
Problem
Conventional microwave backhaul networks suffer from inefficiencies and poor performance due to phase noise, which affects signal quality and reliability.
Innovation Solution
The implementation of a system that uses a test signal to detect and suppress phase noise in microwave backhaul networks by inserting a test signal with a larger bandwidth, allowing for phase noise correction and improving signal quality through phase noise removal circuits and controllers that manage operations across the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional microwave backhaul networks are used, then network coverage and connectivity are maintained, but phase noise degrades signal quality and reliability
Solution Approach 1:
A test signal is introduced as an intermediary component with known characteristics. This test signal is inserted into the microwave backhaul transmission and used to detect phase noise by comparing its received characteristics against expected values, thereby enabling phase noise measurement and suppression without disrupting normal data transmission
Solution Approach 2:
The system implements feedback by continuously monitoring the test signal characteristics and using this information to adjust and suppress phase noise in real-time. The detected phase noise information feeds back to control mechanisms that actively compensate for phase variations, improving signal reliability
2Measurement precision
If a test signal with larger bandwidth is inserted for phase noise detection, then phase noise suppression capability is improved, but bandwidth consumption increases
Solution Approach 1:
The test signal uses excessive bandwidth relative to minimum requirements to ensure sufficient precision in phase noise detection across the entire operating range. This wider bandwidth provides better measurement resolution but consumes more spectral resources, representing a trade-off between measurement precision and bandwidth efficiency
Data Source
AI summary
A system comprises a modulator circuit, a test signal generator circuit, and a control circuit. The modulator circuit is operable to generate a data-carrying signal based on a reference signal. The test signal generator circuit is operable to generate a test signal based on the reference signal. The control circuit is operable to determine current status of a microwave backhaul link. The control circuit is operable to configure a nominal frequency at which the test signal generator circuit generates the test signal based on the determined status of the microwave backhaul link. The control circuit is operable to determine an amount of whitespace to have on either side of the test signal based on the current status of the microwave backhaul link. The control circuit is operable to configure the modulator circuit such that the data-carrying signal has the determined amount of whitespace surrounding the nominal frequency of the test signal.