Antenna Fading Dip Mitigation via Sounding Signal Frequency Selection
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Solution Overview
Problem
Wireless communication networks face challenges due to multipath signal propagation, which causes fading dips in radio channels, degrading performance on wireless backhaul links, especially in local area base stations, and existing methods like equalization are complex and inefficient.
Innovation Solution
Adjusting the carrier frequency and/or the distance between antennas based on measured frequency responses using sounding signals to reduce the impact of fading dips, selecting carrier frequencies with optimal signal levels and minimizing variations, and moving or selecting antennas from arrays to improve signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If equalization methods are used to compensate for fading dips, then communication performance can be maintained, but the system complexity and computational requirements increase significantly
Solution Approach 1:
The patent applies preliminary action by measuring the frequency response in advance using sounding signals before actual data transmission. The base station identifies fading dips and determines optimal carrier frequencies beforehand, so that when data transmission occurs, the system already has the information needed to avoid problematic frequencies without requiring complex real-time equalization processing.
Solution Approach 2:
The patent replaces the mechanical/computational equalization system with a frequency selection approach. Instead of using complex signal processing algorithms to equalize faded signals, the system substitutes this with a simpler mechanism of selecting carrier frequencies that naturally avoid fading dips, thereby eliminating the need for complex equalization hardware and software.
2Reliability
If carrier frequency is adjusted to avoid fading dips, then signal quality improves, but additional measurement and selection procedures are required
Solution Approach 1:
The patent applies self-service by having the base station autonomously perform frequency response measurements using sounding signals and automatically select optimal carrier frequencies based on the measured data. The system serves itself by identifying its own fading dip conditions and making intelligent frequency selections without requiring external intervention or complex coordination with other network elements.
Solution Approach 2:
The frequency response measurement and carrier frequency selection is performed in advance before actual communication occurs. The base station uses sounding signals to map the frequency response, identifies fading dips, and selects optimal frequencies beforehand, so that when data transmission begins, the system is already configured to operate at optimal frequencies without requiring complex real-time adjustments.
3Reliability
If distance between antennas is adjusted to reduce fading impact, then signal reliability improves, but physical reconfiguration of the system is required
Solution Approach 1:
The patent applies parameter changes by adjusting the carrier frequency parameter to avoid fading dips rather than physically changing the antenna distance parameter. By modifying the frequency parameter, the system achieves improved signal reliability without the complexity of physical reconfiguration, while still effectively mitigating the impact of fading dips through intelligent frequency selection.
Data Source
AI summary
The impact of a fading dip in a radio channel on the communication between a first and a second antenna may be reduced by receiving a sounding signal at the first antenna or the second antenna over the radio channel and measuring the frequency response of the radio channel using this sound signal that was received. The radio frequency signal that is used to communicate between the first antenna and the second antenna is adjusted in response to the frequency response that was measured in order to reduce an impact of the fading dip in the radio channel on the radio frequency signal during operation. Related systems, methods, and devices are disclosed.