LDPC Decoder Power Savings via Error Detection
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR networks, face challenges in efficiently managing error correction decoding operations due to varying channel quality, leading to unnecessary power consumption and potential errors in bit recovery.
Innovation Solution
A method where a receiver device determines whether to operate an error correction decoder based on the result of an error detection operation, specifically using a parity check matrix to recover punctured systematic bits and disable the decoder when no errors are detected, thereby reducing power consumption and optimizing decoding operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the error correction decoder operates continuously to correct bit errors, then the reliability of bit recovery is improved, but the power consumption increases
Solution Approach 1:
The error correction decoder's operational state is made dynamic rather than static. The system transitions between enabled and disabled states based on real-time channel quality assessment and error detection results, allowing the decoder to operate only when necessary to maintain reliability while conserving power during good channel conditions
Solution Approach 2:
The system implements feedback mechanisms where error detection operations continuously monitor received bits and channel quality, feeding this information back to control the error correction decoder's operation. This feedback loop ensures the decoder activates only when errors are detected or channel conditions indicate potential errors, optimizing the balance between reliability and power consumption
2Reliability
If the error correction decoder operates to correct bit errors, then the reliability of bit recovery is improved, but the processing time increases
Solution Approach 1:
The decoder's operational state is dynamically adjusted based on actual error conditions. By disabling the decoder during good channel conditions and activating only when errors are detected, the system eliminates unnecessary processing time while maintaining reliability when needed
Solution Approach 2:
The system performs preliminary error detection operations before engaging the full error correction decoding process. This preliminary check determines whether the decoder is needed at all, avoiding unnecessary processing time while ensuring reliability is maintained when errors are actually present
3Use of energy by moving object
If the error correction decoder is disabled to save power, then the power consumption is reduced, but the reliability of bit recovery deteriorates
Solution Approach 1:
Continuous feedback from error detection operations and channel quality assessment ensures the system activates the error correction decoder precisely when reliability is needed. The feedback mechanism monitors bit errors and channel conditions, triggering decoder operation only when necessary to maintain recovery reliability while keeping it disabled during good conditions to conserve power
Solution Approach 2:
The system uses its own error detection capabilities to determine when error correction is needed, making the decision autonomously based on observed conditions. This self-service approach allows the system to disable power-consuming decoding operations during good channel conditions while automatically activating them when errors are detected, maintaining reliability without unnecessary power consumption
4Measurement precision
If error detection operations are performed on all bits, then the accuracy of error detection is improved, but the processing complexity increases
Solution Approach 1:
The error detection operation applies different levels of scrutiny to different bits based on their importance and the channel conditions. By focusing detection resources on critical bits and adjusting detection depth based on channel quality, the system achieves high accuracy for error detection without uniformly processing all bits with maximum complexity
Data Source
AI summary
An apparatus for wireless communication is provided. The apparatus may be a receiver device that includes an error correction decoder, such as a low-density parity check (LDPC) decoder. The apparatus may achieve power savings and/or operation cycle savings by disabling the error correction decoder in scenarios where bits of a codeword in a signal transmission are received without errors. The apparatus obtains a first set of bits of a codeword, wherein the codeword includes the first set of bits and a second set of bits, and wherein the second set of bits is punctured. The apparatus recovers the second set of bits based on at least the first set of bits and determines whether to operate an error correction decoder based on a result of an error detection operation performed on the codeword using the first set of bits and the second set of bits.