I/Q Channel Inversion Switching for Faster Demodulation Sync
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Solution Overview
Problem
Existing demodulation techniques require re-establishing synchronization when channel inversion occurs, leading to increased demodulation time compared to non-inverted channels.
Innovation Solution
Implementing a demodulation device with a channel inversion control unit that switches and synchronizes the I and Q channels at the downstream process, maintaining established frequency and clock synchronization, thereby avoiding the need for re-synchronization upon channel inversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel inversion is detected and channels are switched, then correct demodulation is achieved, but demodulation time increases due to re-establishing synchronization
Solution Approach 1:
The patent applies preliminary action by detecting channel inversion before it causes demodulation errors, using correlation between known and received sequences to identify inversion early. This allows the system to switch channels proactively rather than reactively, maintaining synchronization without interruption and thus reducing demodulation time while ensuring correctness.
Solution Approach 2:
The patent implements feedback by continuously monitoring the correlation value between known sequences and received sequences, using this feedback to detect channel inversion and trigger channel switching. This closed-loop feedback mechanism ensures reliable demodulation by automatically correcting channel inversion while minimizing time loss through rapid detection and response.
2Measurement precision
If channel inversion detection is implemented, then demodulation accuracy improves, but system complexity increases
Solution Approach 1:
The patent uses an intermediary approach by introducing a correlation calculation mechanism that compares known sequences with received sequences. This intermediary correlation value serves as a simple yet effective indicator of channel inversion, achieving high detection accuracy without requiring complex inversion detection circuits or algorithms.
Solution Approach 2:
The patent applies parameter changes by monitoring the correlation value parameter between known and received sequences. When this parameter falls below a threshold, it indicates channel inversion. This simple parameter-based detection method achieves high accuracy while maintaining low system complexity, avoiding the need for sophisticated detection mechanisms.
Data Source
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AI summary
The present technique relates to a demodulation device, a demodulation method and a program capable of realizing a demodulation process at a rate equivalent to a case where I and Q channel signals are not inverted, even when the I and Q channel signals are inverted. A frequency correction unit establishes synchronization of a frequency and clock based on a signal from a frequency synchronization unit. A channel inversion detection unit of a frame synchronization unit detects presence or absence of inversion of I and Q channel signals, and supplies, as a detection result, a channel inversion detection result to the channel inversion control unit. The channel inversion control unit switches the I and Q channel signals if the inversion has occurred, based on the channel inversion detection result. This technique can be applied to a demodulation device.