Bluetooth Interference Detection via Neighboring Frequency RSSI
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Solution Overview
Problem
Bluetooth devices face challenges in distinguishing between interference from wideband and narrowband transmitters, which affects their adaptive frequency hopping algorithms and power consumption due to inefficient background scans.
Innovation Solution
A method for a wireless narrowband receiver to determine if interference on a channel is caused by a wideband or narrowband transmitter by measuring received signal strength on neighboring frequencies, using signal processing logic and a rotator or frequency domain transform to differentiate between transient and persistent sources of interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Bluetooth devices perform background scans over the entire channel range to detect interference, then interference detection capability is improved, but power consumption increases and performance deteriorates
Solution Approach 1:
The patent applies partial action by measuring signal strength at selected neighboring frequencies rather than performing exhaustive scans across the entire channel range. This selective measurement approach provides sufficient interference detection capability while significantly reducing power consumption and performance impact compared to complete background scans.
Solution Approach 2:
The patent performs preliminary measurements at neighboring frequencies when interference is first detected, before committing to full background scans. This preliminary action allows the device to quickly assess whether the interference is wideband (affecting multiple frequencies) or narrowband (affecting only the current channel), enabling faster decision-making about frequency hopping adjustments.
2Reliability
If Bluetooth devices perform frequent background scans to detect new interference, then channel availability accuracy is improved, but performance and power efficiency deteriorate
Solution Approach 1:
The patent uses partial action by performing targeted measurements at neighboring frequencies only when interference is detected, rather than conducting frequent exhaustive background scans. This approach maintains reliable channel availability information while minimizing performance impact and preserving battery life.
3Device complexity
If Bluetooth devices use RSSI measurements alone to detect interference, then detection simplicity is maintained, but interference source identification capability deteriorates
Solution Approach 1:
The patent transitions from one-dimensional RSSI measurements to a multi-dimensional approach by measuring signal strength across multiple frequency dimensions (current channel and neighboring frequencies). This dimensional expansion enables the device to distinguish between wideband and narrowband interference sources while maintaining relatively simple implementation through existing hardware capabilities.
4Use of energy by moving object
If Bluetooth devices avoid background scans to preserve performance, then power consumption and performance are maintained, but ability to detect sporadic traffic deteriorates
Solution Approach 1:
The patent performs preliminary measurements at neighboring frequencies when interference is detected, creating a lightweight detection mechanism that operates without full background scans. This preliminary action enables detection of sporadic wideband traffic while maintaining low power consumption and high performance.
Data Source
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AI summary
System and method for operating a wireless narrowband receiver. A signal may be received on a channel of the wireless narrowband receiver. At least a portion of the signal may be received from a first wireless narrowband transmitter. The wireless narrowband receiver may implement an adaptive frequency hopping algorithm. It may be determined if interference is present on the channel and one or more errors are detected in receiving the signal. In response to determining that interference is present on the channel and one or more errors are detected in receiving the signal, received signal strength of one or more neighboring frequencies of the channel may be measured, and the resulting measurements may be stored in a memory. The measurements may be used to determine interference sources interference on the channel.