Reconfigurable Bluetooth Correlator for Access Code and EDR Detection
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Solution Overview
Problem
Existing Bluetooth receivers require separate and computationally intensive correlation operations for detecting access codes and EDR synchronization sequences, leading to increased hardware requirements and complexity.
Innovation Solution
A flexible correlation circuit that can serially perform both access code and EDR synchronization sequence detection using the same hardware, reducing the number of comparators needed by reconfiguring the correlator based on timing and using adjustable offsets and parallel shift registers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate correlation operations are used for access code detection and EDR synchronization sequence detection, then detection reliability is improved, but device complexity and hardware requirements increase
Solution Approach 1:
The correlator is designed to perform multiple functions by reconfiguring its operation mode. It can detect both access codes and EDR synchronization sequences using the same hardware resource, thereby reducing device complexity while maintaining detection reliability through proper configuration rather than requiring separate dedicated correlators for each function
2Measurement precision
If separate correlation operations are used for access code detection and EDR synchronization sequence detection, then detection accuracy is improved, but processing complexity increases
Solution Approach 1:
The correlator's operation is made dynamic through reconfiguration based on the detected access code. After successfully detecting an access code, the system dynamically adjusts the correlator's parameters and operation mode to detect the EDR synchronization sequence. This dynamic adaptation allows a single correlator to achieve detection accuracy equivalent to having separate dedicated correlators while reducing overall processing complexity
3Reliability
If multiple correlators are used for different detection tasks, then detection performance is improved, but hardware resources increase
Solution Approach 1:
The patent merges the functionality of multiple correlators into a single reconfigurable correlator. By combining access code detection and EDR synchronization sequence detection into one hardware resource that can be dynamically reconfigured, the system achieves the detection performance of multiple dedicated correlators while significantly reducing hardware resource requirements
Data Source
AI summary
A circuit for processing a packet based signal received over a Bluetooth radio link has a correlator to detect at least part of the access code. A correlator controller, reconfigures the correlator according to a timing of the access code, to detect at least part of the EDR synchronization sequence, and a demodulator demodulates the payload according to the detection. The correlator has an input signal register, a buffer for a sequence of at least part of the wanted signal values, and a series of comparators arranged to compare input signal values with corresponding ones of the wanted signal values at more than one offset. By such dual use of the same correlator, the receiver can be made more cost effective.