- to devise the implementation of Reference ’s concept for analyzing the decision threshold with empirical data,
- to improve the accuracy in evaluating the spectrum occupancy of FM radio public bands by the proposed measurement strategies and threshold designation, as well as to gain insights into why the proposed strategies offer higher accuracy than the existing strategies,
- to gain insight into the pattern of spectrum occupancy of FM radio public bands in suburban areas, and
- to identify the channels, which cause interference, and the channels, which are affected by the interference.
2. Measurement Location
3. Measurement Setup
3.1. Measurement Strategy
3.2. Measurement System
3.2.1. Sensing Setup
3.2.2. Data Processing
4. Decision Threshold Selection Criteria, Occupancy Classification Criteria, and Interference Criteria
4.1. Decision Thresholds in Previous Works
4.2. Proposed Implementation
4.2.1. Creating Spectrum Density Map
4.2.2. Creating Channel Occupancy Map
4.2.3. Modeling Channel Occupancy
- A channel has strong activity if its curve has constant occupation percentage while the value of is between zero and one.
- A channel has a good activity if its curve has constant occupation percentage while the value of equals one.
- A channel has no activity if its curve has constant occupation percentage while the value of is zero.
- A channel has weak activity if its curve has constant occupation percentage over many intervals.
4.3.1. Spectrum Density Map
4.3.2. Channel Occupancy Map
4.3.3. Curves of Duty Cycle
4.4. Occupancy Classification Criteria
- A channel is used normally if and ;
- A channel is used abnormally if ;
- A channel is unused normally if and ;
- A channel is unused abnormally if .
4.5. Interference Criteria
4.5.1. Interfered Channel Criteria
- A channel is interfered from adjacent channels if ;
- A channel is interfered from unknown sources if otherwise.
4.5.2. Interference Source Criteria
- A channel is an obvious interference source channel that interfere its adjacent channels if ;
- A channel is an unobvious interference source channel if otherwise.
5. Insight of Spectrum Utilization
5.1. Evaluation of Channel Occupancy
5.2. Evaluation of Channel Usage
5.3. Interfered Channels
5.4. Interference Source Criteria
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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