Viterbi Decoder ACS Reuse for Lower-Power Traceback
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Solution Overview
Problem
Viterbi decoders are resource-hungry, particularly in power-constrained environments such as mobile applications, where reducing power consumption is essential for extended device life and efficient communication.
Innovation Solution
The implementation of reduced complexity Viterbi decoding systems that reuse add compare select logic to determine path metrics and identify a best state, reducing the complexity of the decoding process while maintaining effective communication through noisy channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a full Viterbi decoder is used to ensure accurate decoding of signals through noisy channels, then decoding reliability is improved, but power consumption increases
Solution Approach 1:
The Viterbi decoding process is segmented into distinct phases: an initial phase where the add compare select logic determines path metrics and identifies the best state, and a subsequent phase where the same logic is reused to complete the decoding. This segmentation allows the system to reduce overall computational complexity while maintaining decoding accuracy, thereby reducing power consumption without sacrificing reliability.
Solution Approach 2:
The add compare select logic is designed to perform multiple functions: it first determines path metrics for signal decoding, then identifies the best state, and finally is reused to complete the decoding process. This multi-functionality eliminates the need for separate dedicated logic units, reducing overall device complexity and power consumption while maintaining full decoding capability and reliability.
2Reliability
If the add compare select logic continuously determines path metrics for all possible states, then decoding accuracy is maintained, but device complexity increases
Solution Approach 1:
The add compare select logic operates dynamically by adapting its function at different stages of the decoding process. Initially, it performs full path metric determination for all states to ensure accuracy, then transitions to reusing the same logic with modified operations to complete the decoding. This dynamic operation reduces the need for static, complex hardware configurations while maintaining decoding accuracy throughout the process.
Data Source
AI summary
A system includes a Viterbi decoder. The Viterbi decoder includes add compare select logic. The add compare select logic determines path metrics for an encoded signal. The add compare select logic also is shared to determine a best state by which trace-back procedure gets started, resulting in hardware saving.