Synchronous Compensator Adaptive Enable Range Reflected Wave Interference
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Solution Overview
Problem
Conventional synchronous compensators for PHS systems incorrectly compensate for synchronization errors caused by reflected waves, leading to out-of-synchronism issues due to their inability to differentiate between directly and indirectly received signals.
Innovation Solution
A synchronous compensator that includes a detector for UW words, a load generator that loads a bit counter based on an enable signal defining a compensation range, and a sync timing generator that generates timing signals only within this range, preventing phase correction for signals outside the predetermined range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronous compensation is performed whenever a UW detection signal is detected, then synchronization correction is achieved, but erroneous compensation occurs for reflected waves causing out-of-synchronism
Solution Approach 1:
The patent changes the parameter of compensation enablement from unconditional (whenever UW is detected) to conditional (only when detection timing falls within predicted range). The enable generator compares the actual detection timing with the predicted timing range to dynamically control whether compensation is performed, thereby excluding reflected waves that fall outside the valid timing window.
Solution Approach 2:
The patent introduces an enable generator as an intermediary component between the UW detector and the synchronous compensator. This intermediary evaluates whether the detected UW signal is valid by comparing timing parameters and generates an enable signal that gates the compensation operation, preventing erroneous compensation for reflected waves.
2Reliability
If compensation range is limited to prevent reflected wave interference, then accuracy for direct waves is maintained, but flexibility in handling varying signal conditions is reduced
Solution Approach 1:
The patent makes the compensation range dynamic rather than fixed. The predicted detection timing is calculated based on the relationship between bit counter and slot counter values, allowing the enable range to adapt to different signal conditions and timing variations while still maintaining boundaries that exclude reflected waves.
Data Source
AI summary
In the synchronous compensator, a load generator loads a bit counter with data in dependence upon whether or not a detection signal from a UW detector falls within the range indicated by an enable signal from a synchronous compensator circuit, thereby excluding the detection signal appearing far from the normal position to establish an appropriate synchronous compensation. The synchronous compensation is thus accomplished on the basis of normally received signal waves without picking up abnormal waves supposed as reflected waves.