Start-of-Packet Detector Segmentation for Body-Coupled Communication
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Solution Overview
Problem
Existing start-of-packet detectors in body-coupled communication systems become less reliable at low signal-to-noise ratios and increase in complexity and power consumption with longer SOP lengths, making them unsuitable for certain applications.
Innovation Solution
A start-of-packet detector design that uses two stages to compare subsets of received data with reference data, allowing for reduced circuitry and power consumption, and can interpret both polarities, with a counter to ensure correct ordering and configurable thresholds for noise adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the SOP length is increased to improve detection reliability in low signal-to-noise ratio conditions, then detection reliability is improved, but device complexity and power consumption increase
Solution Approach 1:
The SOP detection process is divided into multiple stages: a first stage that performs initial correlation detection using a correlation threshold, and a second stage that performs more rigorous verification only when the first stage indicates a potential match. This segmentation allows the system to maintain high detection reliability while avoiding the full computational burden of long SOP processing in all cases.
Solution Approach 2:
The detector performs partial verification in the first stage by checking only correlation against a threshold, and performs complete verification only when needed in the second stage. This partial action approach maintains reliability by ensuring full verification occurs when necessary, while reducing overall complexity by avoiding exhaustive verification in every case.
2Reliability
If the SOP length is increased to improve detection reliability in low signal-to-noise ratio conditions, then detection reliability is improved, but power consumption increases
Solution Approach 1:
The power-consuming verification process is segmented into two stages: a low-power initial correlation check and a higher-power verification stage that is only executed when the initial check indicates a potential match. This segmentation ensures that the full power consumption of long SOP verification occurs only when necessary, maintaining reliability while reducing average power consumption.
Solution Approach 2:
The system performs partial verification in the first stage using lower power, and reserves complete verification for the second stage only when needed. This partial action strategy maintains detection reliability by ensuring full verification occurs when necessary, while significantly reducing average power consumption by avoiding exhaustive verification in all cases.
3Device complexity
If a single-stage detector is used to reduce device complexity, then device complexity is reduced, but detection reliability deteriorates in noisy conditions
Solution Approach 1:
The detector is segmented into two functional stages: a first stage that quickly identifies potential SOP locations using correlation thresholding, and a second stage that provides rigorous verification. This segmentation maintains low overall complexity while achieving high reliability in noisy conditions through the coordinated operation of both stages.
Solution Approach 2:
The first stage performs partial verification using correlation thresholding to quickly identify potential matches, while the second stage performs excessive (complete) verification only when needed. This partial/excessive action approach maintains low complexity by avoiding full verification everywhere, while ensuring reliability through complete verification when necessary.
4Use of energy by moving object
If a single-stage detector is used to reduce power consumption, then power consumption is reduced, but detection reliability deteriorates in noisy conditions
Solution Approach 1:
The power consumption is segmented across two stages: a low-power first stage that performs initial correlation detection, and a higher-power second stage that performs verification only when needed. This segmentation maintains low average power consumption while ensuring high detection reliability in noisy conditions through the selective execution of the verification stage.
Solution Approach 2:
The system performs partial verification in the first stage at low power, and performs complete verification in the second stage only when necessary. This partial/excessive action approach maintains low average power consumption by avoiding full verification everywhere, while ensuring reliability through complete verification when the noise conditions require it.
Data Source
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AI summary
A start of packet detector comprises an input which receives start of packet information. The detector has a first stage which determines if there is a match between a respective subset of received start of packet information with a respective subset of reference start of packet information. The first stage repeats the determining for each of the subsets of received start of packet information and said respective subset of reference start of packet information. An output will provide a start of packet detected output which is dependent on the determining of the first stage.