Antenna Selection Diversity Biasing for Signal Path Accuracy
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Solution Overview
Problem
Conventional antenna selection diversity methods are impaired by noise, transients, and offsets, leading to inaccurate power estimates and incorrect antenna selection in wireless communication systems, especially when signal powers among antennas are similar.
Innovation Solution
A method and system that determine and modify signal quality metrics for each antenna path, allowing for biased and dynamic adjustments to select the best signal path based on power level, packet error rate, bit error rate, and interference characteristics, using a processor to cycle through and adjust signal quality metrics for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional antenna selection diversity methods are used, then the system can select the best signal path, but noise, transients, and offsets cause inaccurate power estimates leading to incorrect antenna selection
Solution Approach 1:
The patent applies preliminary action by introducing a bias value before the antenna selection decision is made. The signal quality metric is modified by adding a bias value that is determined in advance, compensating for the effects of noise, transients, and offsets before the final selection occurs. This preliminary modification ensures that the selection is based on corrected metrics rather than corrupted raw measurements.
Solution Approach 2:
The patent changes the parameter of the signal quality metric by adding a bias value to it. This parameter modification transforms the corrupted power estimate into a corrected metric that reflects the true signal quality more accurately. The bias value acts as a correction factor that adjusts the metric to compensate for impairments, thereby improving both measurement precision and selection reliability.
2Reliability
If multiple antennas are monitored for selection diversity, then the system can mitigate multipath fading, but the complexity of determining and comparing power estimates across multiple antennas increases
Solution Approach 1:
The patent merges the tasks of multiple antennas by processing their signal quality metrics through a unified biasing mechanism. Instead of independently processing each antenna's signal through separate complex algorithms, the system applies a common biasing approach to all antenna metrics, simplifying the overall processing while maintaining the benefits of multiple antenna monitoring for mitigating multipath fading.
3Measurement precision
If signal quality metrics are adjusted dynamically, then the accuracy of antenna selection is improved, but the computational overhead and processing time increase
Solution Approach 1:
The bias value is determined in advance or preliminarily, rather than being calculated in real-time for each antenna selection decision. This preliminary determination of the bias reduces the computational overhead during the actual selection process, maintaining high measurement precision while minimizing the loss of time associated with dynamic adjustments.
Data Source
AI summary
Methods and systems for choosing at least one signal path are disclosed. Aspects of the method may include determining a signal quality metric for each of a plurality of signal paths, modifying the signal quality metric for each of the plurality of signal paths, and selecting at least one signal path based on at least one modified signal quality metric. At least one of the signal paths may be cycled through and the signal quality metric may be biased and/or increased and/or decreased for each of the plurality of signal paths by a fixed amount and/or by a predetermined amount. The signal quality metric may also be dynamically changed for each of the plurality of signal paths.