Frame Synchronization Frequency Bias Correction
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Solution Overview
Problem
Existing wireless devices face significant radio interference issues during frame synchronization detection in Bluetooth Low Energy (BLE) networks, leading to inaccurate frequency estimation and impacting localization and security services.
Innovation Solution
A system and method for frame synchronization detection that includes a receiver with a frame synchronization detection circuit, a correlation circuit to compute frequency offset, and a frequency estimation correction circuit to determine bias values, which corrects the frequency estimation using bias indicators, improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional frame synchronization detection is used in BLE networks, then the system can operate with simple detection circuits, but radio interference causes inaccurate frequency estimation
Solution Approach 1:
The system performs preliminary frequency offset computation using correlation methods before final frequency estimation. By pre-computing the frequency offset from the received packet and frame synchronization pattern, the system establishes a baseline that can then be corrected, improving overall accuracy without requiring completely redundant detection circuits
Solution Approach 2:
The system determines bias values from the frame synchronization pattern and feeds this information back to correct the frequency offset. This feedback mechanism allows the system to compensate for systematic errors in frequency estimation by adjusting the initial offset computation with measured bias characteristics from the synchronization pattern itself
2Reliability
If frequency estimation is performed without bias correction, then the detection process is faster and simpler, but localization and security services are degraded
Solution Approach 1:
The bias value determination is performed as a preliminary step using the existing frame synchronization pattern that must already be decoded for packet processing. By extracting bias information from this necessary synchronization data, the system incurs minimal additional processing time while significantly improving localization and security service reliability
Solution Approach 2:
The frame synchronization pattern serves dual purposes: it provides the necessary synchronization information for packet reception and simultaneously provides the bias values needed for frequency correction. The system uses the synchronization pattern itself to generate the correction data, eliminating the need for separate calibration signals or external reference sources
Data Source
AI summary
A wireless device includes a receiver to receive a packet via one or more antennas. A frame synchronization detection circuit coupled to the receiver identifies a frame synchronization pattern within a portion of the packet. A correlation circuit coupled to the frame synchronization detection circuit computes, in response to the identifying of the frame synchronization pattern within the portion of the packet, a frequency offset using a correlation method. A frequency estimation correction circuit coupled to the correlation circuit determines, based on the frame synchronization pattern, a bias value, wherein the bias value corresponds to a data pattern within the frame synchronization pattern indicative of a frequency bias, and applies a correction to the frequency offset, wherein applying the correction to the frequency offset comprises modifying the frequency offset using the bias value.