Polar Code Sub-Block Mapping for Higher-Order Modulation Reliability
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Solution Overview
Problem
Existing polar coding techniques for wireless communication systems do not effectively consider the different bit reliability levels of higher-order modulation schemes, such as QAM, leading to suboptimal encoding and decoding processes.
Innovation Solution
The method involves partitioning a polar code into multiple sub-blocks with the same block length, applying a polar transformation associated with the modulation scheme, and assigning information bits to bit channels based on different reliability levels, followed by interleaving and rate matching to optimize code design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional polar coding techniques are used without considering bit reliability levels, then the encoding process is simple, but the transmission reliability is suboptimal
Solution Approach 1:
The patent applies local quality by differentiating the encoding process for different bit reliability levels. Specifically, it separates information bits into different groups based on their reliability requirements and applies different polar code transformations to each group. This allows the system to optimize for reliability by matching code characteristics to bit importance, while maintaining manageable complexity through structured segmentation rather than complete redesign of the encoding process.
Solution Approach 2:
The patent segments the information bit vector into multiple groups based on reliability levels before encoding. By dividing the bit stream into segments with different reliability requirements and applying appropriate polar code transformations to each segment, the system achieves improved overall reliability without requiring a complete overhaul of the encoding architecture. This segmentation approach balances reliability improvement with complexity management.
2Reliability
If polar code is partitioned into multiple sub-blocks for higher-order modulation, then bit reliability is improved, but processing complexity increases
Solution Approach 1:
The patent partitions the polar code into multiple sub-blocks, where each sub-block corresponds to a specific reliability level. This segmentation allows independent optimization of each sub-block's code characteristics while maintaining an overall structured framework. The modular sub-block structure improves bit channel reliability through targeted code design without requiring complete redesign of the entire code structure, thus managing complexity through hierarchical organization.
Solution Approach 2:
The patent introduces dynamic adaptation by adjusting the partitioning and transformation parameters of polar code sub-blocks based on modulation scheme requirements and channel conditions. This dynamic approach allows the system to optimize reliability for each sub-block according to specific operational requirements while maintaining a flexible framework that can adapt to different scenarios without requiring completely different code structures for each case.
3Productivity
If rate matching is performed on polar coded bits, then code rate is optimized, but processing time increases
Solution Approach 1:
The patent performs preliminary rate matching operations during the code design and partitioning phase, before the actual encoding and transmission process. By pre-determining which bits require rate matching and preparing the appropriate transformation patterns in advance, the system optimizes code rate without requiring extensive real-time processing during transmission. This preliminary preparation reduces processing time during critical transmission operations while maintaining encoding efficiency.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some examples, a transmitting device, such as a user equipment (UE) or a network entity, may encode an information bit vector into multiple code blocks using a polar code partitioned into multiple sub-blocks having a same block length in accordance with a polar transformation associated with a modulation scheme. In some examples, each code block of the multiple code blocks may be encoded using a respective sub-block of the multiple sub-blocks. Additionally, the transmitting device may interleave respective bits of each code block of the multiple code blocks using a respective interleaver of multiple interleavers. As such, the transmitting device may transmit the respective interleaved bits of each code block of the multiple code blocks over a respective bit channel of multiple bit channels, where each bit channel of the multiple bit channels is associated with a respective reliability.