Signal Power Detection Using Dual Threshold Comparison
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Solution Overview
Problem
In communication systems, the fast and enormous changes in signal power due to different types of modulation and high peak to average power ratios (PAPRs) make it difficult for receivers to accurately detect signal power.
Innovation Solution
A receiving device and method that utilize two thresholds to compare signal powers, with a control circuit determining whether the average signal power is greater than a reference power based on the comparison results from both thresholds, thereby accurately detecting signal power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal power detection is performed using conventional methods, then the detection process is simple, but the detection accuracy deteriorates due to fast and enormous signal power changes caused by different modulation types and high PAPRs
Solution Approach 1:
The detection process is segmented into multiple stages: first comparing signal power with a first threshold to generate first comparison results, then comparing with a second threshold to generate second comparison results, and finally determining whether average signal power exceeds reference power based on both sets of results. This segmentation allows accurate detection despite fast signal power changes.
Solution Approach 2:
The system performs preliminary comparisons of signal power against two different thresholds before making the final determination. By pre-comparing signal power with both thresholds and storing the comparison results, the system prepares the necessary data in advance to accurately determine whether average signal power exceeds reference power, even when signal power changes rapidly.
2Reliability
If conventional single-threshold detection is used, then the device complexity is low, but the detection reliability deteriorates under high PAPR conditions
Solution Approach 1:
The detection process is divided into two independent comparison stages with different thresholds. The first receiving circuit compares signal power with the first threshold, and the second receiving circuit compares with the second threshold. This segmentation provides redundant verification that improves reliability under varying signal conditions including high PAPR.
Solution Approach 2:
The system performs more comparison operations than a conventional single-threshold system by comparing signal power against two different thresholds. This excessive action of performing additional comparisons ensures that the detection remains reliable even when signal power fluctuates rapidly due to high PAPR or different modulation types.
3Measurement precision
If the receiver attempts to track fast signal power changes, then detection accuracy may improve, but detection delay increases
Solution Approach 1:
The system performs preliminary comparisons with both thresholds and stores the results before making the final determination. This preliminary action allows the system to quickly determine whether average signal power exceeds reference power without needing to continuously track fast signal power changes, thereby reducing detection delay while maintaining accuracy.
Solution Approach 2:
By comparing signal power with two thresholds simultaneously and using the comparison results to determine average signal power status, the system achieves accurate detection with a single measurement cycle rather than requiring multiple sequential measurements to track changes. This reduces detection delay while maintaining precision.
Data Source
AI summary
A receiving device comprises a first receiving circuit, for receiving a plurality of signals and comparing a plurality of signal powers of the plurality of signals with a first threshold, to generate a first plurality of comparison results; a second receiving circuit, for receiving the plurality of signals and comparing the plurality of signal powers of the plurality of signals with a second threshold, to generate a second plurality of comparison results, wherein the first threshold is smaller than the second threshold; and a control circuit, coupled to the first receiving circuit and the second receiving circuit, for determining whether an average signal power of the plurality of signals is greater than a reference power according to the first plurality of comparison results and the second plurality of comparison results, to generate a determination result.