Polar-Coded HARQ Retransmission for Stable Decoding Performance
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Solution Overview
Problem
The decoding performance of polar codes in wireless communication systems is poor when using existing Hybrid Automatic Repeat Request (HARQ) technology due to code word puncturing, which disrupts the polarization channel capacity distribution.
Innovation Solution
A method where polar-coded code words are sent with information bits sorted by channel capacity in descending order for initial transmission and retransmission, ensuring the largest channel capacity bits carry user data, and frozen bits are set to a preset value to improve decoding efficiency and gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If code word puncturing is used for HARQ retransmission, then retransmission can be achieved, but polarization channel capacity distribution is disrupted and decoding performance deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-selecting and marking specific bit positions as retransmission bit positions before actual transmission. These positions are identified in advance based on channel capacity analysis, and their values are preserved during puncturing operations. This allows the receiver to correctly identify and utilize retransmitted bits without disrupting the polarization channel capacity distribution, thereby maintaining high decoding performance while enabling reliable retransmission.
2Productivity
If information bits are placed in bits with channel capacity approaching 1, then optimal transmission performance is achieved, but puncturing these bits for retransmission destroys the capacity distribution
Solution Approach 1:
The patent segments the code word bits into different functional categories: information bits, frozen bits, and retransmission bits. By this segmentation, retransmission bits are specifically designated positions that can be punctured and retransmitted without affecting the overall polarization channel capacity distribution. This segmentation allows information bits to be placed in high-capacity positions for optimal transmission efficiency while maintaining the integrity of the capacity distribution through dedicated retransmission bit positions.
Solution Approach 2:
The patent applies local quality by assigning different roles to different bit positions within the code word. Specifically, certain bit positions are designated with the local quality of being retransmission-capable, meaning their values are preserved and retransmitted even when other bits are punctured. This localized special treatment ensures that the overall polarization channel capacity distribution remains intact while enabling targeted retransmission of specific bits, thus maintaining both transmission efficiency and capacity distribution integrity.
Data Source
AI summary
This application provides a data sending method, a data receiving method, a sending device, and a receiving device. The data sending method includes: sending a 1st polar-coded code word, where the 1st code word includes n 1st information bits carrying user data; and sending a 2nd polar-coded code word after sending the 1st code word is completed, where the 2nd code word includes p 2nd information bits carrying user data, and each 2nd information bit carries same user data as one uniquely corresponding 1st retransmission bit. According to the data sending method, the data receiving method, an apparatus, a device, and a system provided in this application, decoding performance of the code words can be improved.