Polar Code Construction Using Mutual Information Bit Reliability
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Solution Overview
Problem
Conventional polar code construction methods rely on deficient bit channel reliability metrics, which affect the accuracy of information bit allocation in wireless communication systems, leading to suboptimal performance in error correction and transmission reliability.
Innovation Solution
The proposed method employs a mutual information-based approach for polar code construction, using a recursive model with a mutual information transfer function to determine the reliability order of bit channels, allowing for accurate identification of information bit locations and improved error correction capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional bit channel reliability metrics are used for polar code construction, then the implementation is simple, but the accuracy of information bit allocation is poor
Solution Approach 1:
The patent changes the parameter used for reliability assessment from conventional metrics (such as Bhattacharyya parameter) to mutual information metric. This parameter change enables more accurate characterization of bit channel reliability, thereby improving the accuracy of information bit allocation while maintaining computational feasibility through efficient mutual information estimation methods
Solution Approach 2:
The patent substitutes the conventional reliability metric calculation mechanism with a mutual information-based mechanism. By using mutual information to quantify the reliability of bit channels, the system achieves more precise measurement of channel characteristics, which directly improves information bit allocation accuracy without requiring overly complex computational structures
2Reliability
If accurate reliability metrics are used to determine bit channel ordering, then error correction performance is improved, but computational complexity increases
Solution Approach 1:
The patent applies partial action by estimating mutual information for bit channel reliability assessment rather than performing exhaustive channel analysis. This partial estimation approach provides sufficiently accurate reliability metrics to determine optimal bit channel ordering and improve error correction performance, while avoiding the excessive computational energy consumption that would result from more comprehensive analysis methods
Solution Approach 2:
By changing from conventional reliability parameters to mutual information parameters, the patent achieves better transmission reliability through more accurate bit channel characterization. The mutual information metric provides a computationally efficient yet accurate measure of channel reliability, improving error correction without proportional increases in energy consumption
3Measurement precision
If mutual information based approach is used for bit channel reliability determination, then information bit allocation accuracy is improved, but the complexity of the encoding process increases
Solution Approach 1:
The patent performs preliminary calculation of mutual information values for all bit channels before the actual encoding process. By pre-determining the reliability ordering of bit channels based on mutual information, the system establishes an optimal information bit allocation scheme in advance, which simplifies the actual encoding operation while maintaining high allocation accuracy
Solution Approach 2:
The patent changes the fundamental parameter for bit channel evaluation from conventional metrics to mutual information. This parameter change enables more precise information bit allocation by accurately reflecting channel reliability, while the mutual information calculation can be performed efficiently through recursive formulas that reduce encoding process complexity
Data Source
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AI summary
Methods, systems, and devices for wireless communication are described for mutual information based polar code construction. A wireless device may receive a codeword over a wireless channel, the codeword encoded using a polar code. The wireless device may identify a set of bit locations of the polar code corresponding to information bits of an encoded information bit vector. The set of bit locations may be determined based at least in part on a reliability order of the bit locations of the polar code, and the reliability order may be determined based at least in part on a recursive model that includes at least one mutual information transfer function that is applied at each polarization stage of multiple polarization stages of the polar code. The wireless device may decode the received codeword to obtain the information bit vector at the set of bit locations.