Radar Frequency Detection for Sub-Channel Bandwidth Allocation
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Solution Overview
Problem
Secondary users in wireless networks face constraints in using channels due to the presence of primary users, such as radar, which limits bandwidth availability and requires efficient detection and avoidance of radar frequencies to prevent interference.
Innovation Solution
A wireless device equipped with radar detection logic that selects a wideband channel, determines the frequency of a radar signal, and maps it to a specific sub-channel, allowing communication on other sub-channels that do not include the radar frequency, thereby enabling bandwidth utilization without interfering with primary users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a secondary user detects a primary user (radar) on a wideband channel, then the secondary user must avoid the radar frequency to prevent interference, but this reduces the available bandwidth for secondary user communication
Solution Approach 1:
The wideband channel is divided into multiple sub-channels, allowing the secondary user to segment the bandwidth and selectively use only those sub-channels that do not contain the radar signal, thereby maintaining reliability while preserving available bandwidth for communication
Solution Approach 2:
The radar-affected sub-channel is extracted and excluded from use, while the remaining clean sub-channels are retained for secondary user communication, effectively removing the harmful portion while preserving the useful bandwidth
2Productivity
If the secondary user increases the bandwidth of the channel to improve throughput, then the physical layer throughput increases, but the likelihood of detecting primary user radar signals increases, constraining channel usage
Solution Approach 1:
The wideband channel is segmented into multiple sub-channels, enabling the secondary user to maintain high throughput by utilizing multiple clean sub-channels while adapting to radar presence by excluding only the affected sub-channel from use
Solution Approach 2:
The system dynamically adjusts channel usage by detecting radar signals and adaptively selecting which sub-channels to use or avoid, allowing the secondary user to optimize throughput while maintaining channel availability despite the presence of primary users
Data Source
AI summary
In an example embodiment, a channel that includes a plurality of sub-channels is sampled to detect pulses indicative of a presence of a radar signal. A frequency for the radar signal is determined. If the frequency of the radar signal maps to a selected subset of the plurality of sub-channels, the selected subset of the plurality of sub-channels are determined to be unavailable due to radar, while the remaining sub-channels remain available for use. The selected subset of the plurality of sub-channels determined to be unavailable due to radar may be selectively returned for use after the radar signal is no longer detected for a predetermined selected time period.