Backscatter Device CTE Synchronization via Energy Detection
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Solution Overview
Problem
Existing backscatter communication systems face challenges in accurately identifying the start of the constant tone extension (CTE) in modified data packets, leading to synchronization issues and potential interference with traditional Bluetooth networks.
Innovation Solution
A backscatter enabled device is designed with energy detection means to identify the start of the CTE by detecting a guard interval and waiting for a trigger, allowing for modulation of the constant tone based on data to be sent without requiring decoding of the data payload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the backscatter device uses energy detection means to identify the start of CTE by detecting guard interval and waiting for trigger, then the device can operate at low power levels and maintain accurate synchronization, but the device complexity increases due to additional detection and waiting logic
Solution Approach 1:
The backscatter device uses the incoming signal's own structure (guard interval followed by constant tone) to automatically trigger its operation. The energy detection means detects the guard interval and the constant tone extension automatically initiates the backscattering process without requiring external control or complex processing of the payload data, enabling low-power operation.
Solution Approach 2:
The system performs preliminary detection of the guard interval and constant tone extension before actually modulating and transmitting the backscattered signal. This preliminary action allows the device to synchronize properly and only activate the modulation logic when the CTE is detected, reducing overall power consumption while maintaining accuracy.
2Productivity
If the backscatter device modifies the constant tone extension without decoding the payload, then data transmission efficiency improves and processing time is reduced, but the measurement precision of the signal start position becomes more difficult to achieve
Solution Approach 1:
The system extracts only the necessary triggering information (guard interval and constant tone detection) from the incoming signal, separating this function from the payload data processing. By taking out the start position detection function and implementing it through simple energy detection of the guard interval and constant tone, the system achieves both high productivity and sufficient measurement precision without needing to decode the entire payload.
3Adaptability or versatility
If the backscatter device uses standard Bluetooth packets as carrier signals, then compatibility with traditional Bluetooth networks is maintained, but interference with other Bluetooth devices in the vicinity increases
Solution Approach 1:
The backscatter device modifies only the specific portion of the Bluetooth packet (the constant tone extension) that is needed for backscattering, while leaving the rest of the packet (preamble, header, payload) unchanged. This local modification allows the device to maintain compatibility with traditional Bluetooth networks for packet recognition and routing, while the modified CTE portion enables backscatter functionality without interfering with other Bluetooth devices that expect standard packet structures.
Data Source
AI summary
Described herein is a backscatter enabled device comprising: a receiver for receiving a signal in a first frequency channel including a data payload modulated onto a carrier and a constant tone extension at least part of which comprises a constant tone; energy detection means for detecting energy in the signal and initiating wait logic when, following an initial detection of energy, no energy is detected during a time period; wherein the wait logic is configured to wait for a trigger indicating that the constant tone is being received and send a start signal at the trigger; signal modulation means for receiving the start signal and, in response, modulating the constant tone based on data to be sent to produce a backscatter signal; and a transmitter for transmitting the backscatter signal. Also described herein is a transmitting device for use in a communication system comprising at least one backscatter enabled device and a receiving device and a communication system.