RF Data Packet Capture Triggering via Signal Pattern Analysis
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Solution Overview
Problem
Current wireless device test systems face challenges in accurately capturing and analyzing test data packets due to non-deterministic self-calibration and variable signal power levels, leading to erroneous detections and inefficient testing.
Innovation Solution
A system and method that capture and analyze RF data packets by identifying repeated patterns and subsequent changes in packet durations and inter-packet intervals, triggering data packet capture and analysis only after confirming the end of self-calibration sequences and stable signal power levels, using data packet capture and analysis circuitry to retain and process recent packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If triggering is used to initiate action on subsequent test events in advance, then the tester can prepare for test packets, but the tester must know ahead in time when to capture data packets, which complicates the system when non-deterministic self-calibration is interspersed
Solution Approach 1:
Instead of triggering in advance before test packets arrive, the system triggers in response after detecting changes in signal characteristics. The triggering mechanism is inverted from proactive to reactive, allowing the system to automatically distinguish between self-calibration events and actual test packets without requiring advance knowledge or complex pre-programming.
Solution Approach 2:
The system continuously monitors signal characteristics and uses this feedback to dynamically determine when to capture packets. By detecting changes in signal properties and using them as triggers, the system adapts to the actual transmission pattern, automatically identifying test packets versus self-calibration events without complex external control.
2Stability of the object's composition
If the device under test employs non-deterministic self-calibration, then signal stability is improved, but erroneous detection of self-calibration events as test packets occurs, reducing measurement precision
Solution Approach 1:
The system monitors changes in signal parameters such as packet duration and inter-packet intervals to distinguish between self-calibration events and actual test packets. By detecting parameter transitions rather than relying on fixed thresholds, the system maintains high detection accuracy while allowing the DUT to perform necessary self-calibration operations.
Solution Approach 2:
The system captures and stores data packets in advance before triggering analysis. This preliminary capture allows the system to retain packets for later examination, ensuring that no test packets are missed during self-calibration periods while maintaining the ability to accurately analyze packets when ready.
3Reliability
If data packets are captured continuously, then no test packets are missed, but non-test-related events such as self-calibration are also captured, increasing loss of time for analysis
Solution Approach 1:
The system extracts and captures only the relevant test data packets by using triggering mechanisms that identify when actual test packets are being transmitted versus when self-calibration is occurring. This selective extraction ensures complete capture of test packets while excluding non-test events, reducing unnecessary analysis time.
Solution Approach 2:
The system performs preliminary capture of data packets in storage before triggering analysis. This allows packets to be buffered and held ready, enabling the system to analyze them only when appropriate triggers indicate they are valid test packets, thereby avoiding wasted analysis time on self-calibration events while ensuring no test packets are missed.
Data Source
AI summary
System and method for capturing and enabling analysis of one or more test data packets from a radio frequency (RF) data packet signal transmitter device under test (DUT). Recently captured data packets from a received RF data packet signal are retained for analysis following confirmation that they contain potentially valid test data packets. Such confirmation is achieved by confirming that a data pattern defined by currently captured data packets differs from a data pattern defined by subsequently received data packets. Following such confirmation, a trigger signal initiates access and/or analysis of the captured data packets.