Dynamic Multi-Path Detection Device for Wireless Communication Systems
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Solution Overview
Problem
Existing dynamic multi-path mitigation devices in wireless communication systems face challenges in accurately detecting dynamic multi-path impairments, leading to erroneous adjustments and failure to mitigate errors, particularly when distinguishing between noise and multi-path sources, and existing methods are either ineffective or increase noise sensitivity.
Innovation Solution
A dynamic multi-path detection device utilizing narrow-band signal metric estimators to measure signal characteristics within specific frequency bands, generating a dynamic multi-path indication signal to adjust the adaptation speed of adaptive equalizers, thereby mitigating dynamic multi-path impairments effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If faster adaptation speed is used to track dynamic multi-path, then tracking speed is improved, but sensitivity to noise increases
Solution Approach 1:
The patent implements dynamic adaptation speed adjustment based on detected multi-path conditions. The system transitions from fixed adaptation speed to variable speed that adapts to channel conditions, allowing fast tracking when multi-path is detected while reducing speed when noise is present, thus resolving the contradiction between tracking speed and noise sensitivity
Solution Approach 2:
The patent employs feedback mechanisms where error level information from the FEC decoder is fed back to control the adaptation speed. This closed-loop control allows the system to adjust adaptation speed based on actual performance, reducing noise sensitivity while maintaining tracking capability through intelligent feedback-driven speed modulation
2Reliability
If adaptive equalizer is used to compensate for frequency-selective fading, then multi-path mitigation is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary detection of multi-path conditions using narrow-band signal metric estimators before full equalization processing. This preliminary action identifies when multi-path is present and triggers appropriate equalizer adaptation, avoiding unnecessary complex processing when simple AGC is sufficient, thus reducing overall device complexity while maintaining mitigation effectiveness
Solution Approach 2:
The patent applies different processing qualities to different frequency bands using narrow-band estimators. Instead of uniformly processing the entire bandwidth, the system focuses computational resources on specific frequency regions where multi-path is detected, reducing overall complexity while maintaining effective mitigation where needed
3Extent of automation
If error level is used to adjust adaptation speed, then automatic adjustment is improved, but ability to distinguish noise from multi-path deteriorates
Solution Approach 1:
The patent segments the frequency spectrum into multiple narrow bands and processes each band independently using separate signal metric estimators. This segmentation allows the system to detect multi-path characteristics in specific frequency regions without being overwhelmed by noise in other regions, improving source detection accuracy while maintaining automatic adjustment through the aggregated error level feedback
Data Source
AI summary
In one embodiment of the present invention, a dynamic multi-path detection device is disclosed to include at least one narrow-band signal metric estimator responsive to input signal. Each of the at least one estimators measures a particular characteristic of the input signal in a frequency band that is narrower than the overall signal bandwidth and is operative to generate a signal parameter estimate signal. The dynamic multi-path detection device is further disclosed to include a signal metric comparison device responsive to the signal parameter estimate signal(s) and operative to generate a dynamic multi-path indication signal for detecting dynamic multi-path.