Wireless Device Coherence Testing via Composite Phase Offset
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Solution Overview
Problem
Current wireless communication systems face challenges in testing wireless device (WD) coherence transmission related to joint channel estimation, particularly in ensuring phase and amplitude consistency across time slots, which affects channel estimation quality and overall link performance.
Innovation Solution
A method and device for testing WD coherence transmission by measuring channel responses across multiple time slots, determining phase offsets, and calculating a composite phase offset value to assess transmission coherence performance, with the option to select maximum phase offsets or calculate root mean square values for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase and amplitude consistency is enforced across time slots for joint channel estimation, then channel estimation quality is improved, but transmission flexibility and system adaptability are reduced
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting phase and amplitude constraints based on transmission conditions. The system can switch between coherent transmission modes (enforcing phase consistency) and non-coherent modes (allowing phase variations) depending on channel conditions, thereby resolving the contradiction between estimation quality and transmission flexibility.
Solution Approach 2:
The patent implements dynamic adaptation of coherence requirements across different time slots and transmission scenarios. The system dynamically determines whether to enforce phase consistency based on real-time channel conditions, enabling flexible operation that balances channel estimation quality with transmission adaptability.
2Measurement precision
If multiple time slots are used for joint channel estimation, then estimation accuracy is improved, but transmission latency increases
Solution Approach 1:
The patent segments the channel estimation process into individual time slot analyses while maintaining the ability to combine results for joint estimation. This allows the system to process each slot independently for quick decisions while still benefiting from multi-slot joint estimation when conditions permit, thereby reducing latency.
Solution Approach 2:
The patent applies partial action by performing joint channel estimation across multiple time slots only when necessary and beneficial. The system can opt for single-slot estimation when latency is critical and switch to multi-slot joint estimation when accuracy is prioritized, implementing a flexible middle ground between complete and partial processing.
3Reliability
If phase offsets are measured and corrected across time slots, then transmission coherence is improved, but system complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where phase offset measurements from previous time slots are used to adjust current transmissions. The system measures phase offsets, feeds this information back to the transmitter, and applies corrections, thereby improving coherence while managing complexity through automated closed-loop control.
Solution Approach 2:
The system performs self-service by automatically measuring and correcting its own phase offsets without external intervention. The transmitter autonomously monitors transmission quality, identifies phase deviations, and applies corrections, reducing the need for complex external synchronization systems.
Data Source
AI summary
A testing device (17) is provided. The testing device (17) includes processing circuitry (66) configured to measure a plurality of channel responses associated with a plurality of subcarriers in a plurality of time slots, determine a plurality of phase offsets where each one of the plurality of phase offsets corresponds to a phase offset between the measured channel response in a first time slot and the measured channel response in a reference time slot over a respective one of plurality of subcarriers and where the first time slot is part of the plurality of time slots, determine a composite phase offset value based on the plurality of phase offsets, and determine a wireless device transmission coherence performance based on the composite phase offset value.