FEC Decoder Bypass for Power Reduction in Wireless Receivers
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Solution Overview
Problem
In broadband wireless networks, the inefficient operation of forward error correction (FEC) decoders in receivers leads to significant power consumption and reduced battery life in mobile wireless communications devices, especially in poor signal conditions.
Innovation Solution
A method and device that selectively disable or bypass the FEC decoder based on a reliability metric of the received radio frequency channel quality, using a reliability threshold to predict when FEC decoding is likely to fail, thereby conserving power and utilizing a Hybrid-ARQ unit to request retransmissions when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If FEC decoding is performed on all received code blocks, then decoding reliability is maintained, but power consumption increases significantly
Solution Approach 1:
The patent applies preliminary action by performing channel quality assessment and decoding probability prediction before initiating FEC decoding. The receiver evaluates channel conditions and predicts whether decoding is likely to succeed, then selectively enables or disables the FEC decoder based on this prediction. This prevents unnecessary decoding operations in poor channel conditions, significantly reducing power consumption while maintaining decoding reliability when conditions are favorable.
2Productivity
If FEC decoder operates in poor signal conditions, then decoding attempts are made, but decoding success probability is low and resources are wasted
Solution Approach 1:
The patent implements dynamics by making the FEC decoder operation dynamic rather than static. The receiver continuously monitors channel quality metrics and adjusts the decoding operation state in real-time based on current conditions. When channel quality deteriorates below a threshold, the system dynamically switches from active decoding to a bypass state, adapting to changing signal conditions and avoiding inefficient resource utilization in poor signal environments.
3Use of energy by moving object
If FEC decoding is bypassed in poor channel conditions, then power consumption is reduced, but decoding reliability may be compromised
Solution Approach 1:
The patent employs feedback mechanisms where the receiver continuously monitors channel quality metrics and uses this information to control FEC decoder operation. The system measures channel conditions, compares them against thresholds, and provides feedback to the decoding control logic to adjust operation accordingly. This closed-loop approach ensures that decoding is performed only when channel conditions support successful decoding, maintaining reliability while minimizing power consumption.
Data Source
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AI summary
A method and device for performing forward error (FEC) correction avoidance based upon predicted block code reliability in a communications device is provided. An avoidance unit comprising a metric computation unit and a decision unit generates a reliability metric based upon a received code block. The reliability metric is compared to a reliability threshold, and the forward error correction decoder in the communications device is disabled if the metric is below or equal to the threshold.