CDF-Based Least Reliable Bit Identification for Low-Latency Decoding
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Solution Overview
Problem
Existing communication systems face challenges in accurately decoding codewords received via noisy channels, particularly in identifying the least reliable bits (LRBs) using complex and resource-intensive methods like the Chase algorithm, which leads to high power consumption and latency.
Innovation Solution
A method for LRB identification based on cumulative distribution functions (CDFs) is introduced, employing a two-pass algorithm to simplify the identification process and reduce complexity by generating a CDF of reliability values, allowing efficient scanning to identify LRBs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Chase algorithm is used for LRB identification, then decoding accuracy is improved, but power consumption and computational complexity increase
Solution Approach 1:
The patent extracts only the essential function of LRB identification from the complex Chase algorithm. Instead of implementing the full Chase algorithm, the invention isolates and implements only the bit reliability assessment component, discarding the computationally intensive parts while retaining the core functionality needed for accurate decoding.
Solution Approach 2:
The patent replaces the expensive, complex Chase algorithm with a simpler, more efficient alternative that consumes less power. The new method uses basic reliability value computation and comparison operations that are computationally inexpensive, effectively substituting a 'cheap' solution for the 'expensive' Chase algorithm while achieving comparable LRB identification accuracy.
2Reliability
If the Chase algorithm is used for LRB identification, then decoding accuracy is improved, but latency increases
Solution Approach 1:
The patent extracts only the essential function of LRB identification from the complex Chase algorithm. Instead of implementing the full Chase algorithm, the invention isolates and implements only the bit reliability assessment component, discarding the computationally intensive parts while retaining the core functionality needed for accurate decoding.
Solution Approach 2:
The patent skips the time-consuming iterative and exhaustive search steps of the Chase algorithm. By directly computing reliability values and identifying LRBs through simple comparisons, the method rushes through the identification process much faster, reducing latency while maintaining accuracy.
3Reliability
If soft decision decoding is used, then decoding accuracy is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential function of LRB identification from the complex Chase algorithm. Instead of implementing the full Chase algorithm, the invention isolates and implements only the bit reliability assessment component, discarding the computationally intensive parts while retaining the core functionality needed for accurate decoding.
Solution Approach 2:
The patent replaces the expensive, complex Chase algorithm with a simpler, more efficient alternative that consumes less power. The new method uses basic reliability value computation and comparison operations that are computationally inexpensive, effectively substituting a 'cheap' solution for the 'expensive' Chase algorithm while achieving comparable LRB identification accuracy.
Data Source
AI summary
A least reliable bit (LRB) identification approach based on a cumulative distribution function (CDF) is disclosed. In some embodiments, a receiver includes a detector and a decoder. The detector is configured to receive a codeword and determine a list of reliability values for the bits included in the codeword. The decoder is configured to receive, from the detector, the codeword and the list of reliability values, compute a list of CDFs of the reliability values for the codeword, identify, from the CDF list, a group including a specific number of LRBs that have the reliability values within a threshold range, and determine a location of each LRB of the group in the codeword.