Radio Signal Correlation for In-Operation PIM Estimation
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Solution Overview
Problem
Existing radio communication systems face challenges in accurately estimating the generation amount of passive intermodulation (PIM) signals during operation due to significant changes in reception signal frequency characteristics after passing analog filters, making it difficult to discriminate and monitor PIM signals amidst overlapping reception signals.
Innovation Solution
A radio communication apparatus and method that includes a transmission signal acquisition unit, reception signal acquisition unit, storage unit, calculation unit, and estimation unit to generate a replica signal of intermodulation distortion, calculate correlation gain, and estimate PIM signals based on correlation between the replica and reception signals, using reference power and correlation gain stored in the storage unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If analog filters are used to process reception signals, then frequency characteristics are improved, but PIM signal discrimination becomes difficult
Solution Approach 1:
The system performs preliminary action by generating a replica PIM signal before the reception signal passes through analog filters, and calculates correlation gain between the replica signal and the filtered reception signal. This allows PIM signal estimation to be performed on the already-filtered signal, avoiding the problem of trying to discriminate PIM signals before filtering when frequency characteristics have not yet been optimized.
2Measurement precision
If replica signal correlation method is used, then PIM signal estimation accuracy is improved, but device complexity increases
Solution Approach 1:
The system uses the copying principle by creating a replica signal that replicates the characteristics of the expected PIM signal. This replica signal is generated by combining transmission signals at frequencies that would produce intermodulation distortion, then correlating it with the actual reception signal to estimate PIM components. This approach achieves accurate PIM estimation without requiring complex additional hardware.
3Reliability
If PIM signal monitoring is performed during operation, then system reliability is improved, but measurement precision deteriorates
Solution Approach 1:
The system implements feedback by continuously monitoring reception signals during operation, calculating correlation gain between the replica PIM signal and the actual reception signal, and using this feedback to estimate and compensate for PIM signal components. This allows the system to maintain reliable operation while achieving accurate PIM signal monitoring through the correlation-based measurement method.
Data Source
AI summary
A radio communication apparatus includes a transmission signal acquisition unit, a reception signal acquisition unit, a storage unit, a calculation unit and an estimation unit. The transmission signal acquisition unit acquires a plurality of transmission signals wirelessly transmitted at different frequencies. The reception signal acquisition unit acquires a reception signal. The storage unit stores reference power and a reference correlation gain. The calculation unit generates a replica signal of an intermodulation distortion signal based on the plurality of transmission signals and calculates a correlation gain based on a correlation between the replica signal and the reception signal. The estimation unit that estimates the intermodulation distortion signal based on the correlation gain calculated by the calculation unit and the reference power and the reference correlation gain stored in the storage unit.