Polar-Coded HARQ Retransmission with Channel-Capacity Bit Allocation
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Solution Overview
Problem
Polar code-based HARQ technology experiences poor decoding performance due to code word puncturing, which disrupts the polarization channel capacity distribution, leading to suboptimal performance in initial transmission and combined code words.
Innovation Solution
The method involves generating code words with bits sorted by channel capacity, ensuring that all bits used for initial and retransmission carry the largest channel capacity, allowing for combined code words that maximize coding and energy gains through selective bit allocation and preset values for frozen bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If code word puncturing is used to generate initial transmission and retransmission code words, then retransmission can be achieved, but polarization channel capacity distribution is disrupted leading to poor decoding performance
Solution Approach 1:
The patent pre-calculates and stores the optimal bit selection mask corresponding to each code rate before actual transmission. When retransmission is needed, the terminal directly selects bits from the initial code word using the pre-stored mask, avoiding real-time channel capacity recalculation and ensuring optimal bit selection maintains the polarization channel capacity distribution.
Solution Approach 2:
The patent changes the code rate parameter to select different pre-stored masks. Each code rate has a corresponding optimal mask that was pre-calculated to maintain proper channel capacity distribution. By selecting the appropriate mask based on the target code rate, the system adapts to different transmission conditions while preserving decoding performance.
2Productivity
If bits are selected for initial transmission code word, then transmission efficiency is improved, but channel capacity distribution is affected leading to suboptimal retransmission performance
Solution Approach 1:
The patent pre-calculates and stores the optimal bit selection mask corresponding to each code rate before actual transmission. When retransmission is needed, the terminal directly selects bits from the initial code word using the pre-stored mask, avoiding real-time channel capacity recalculation and ensuring optimal bit selection maintains the polarization channel capacity distribution.
Solution Approach 2:
The patent creates a copy of the initial code word and uses the pre-stored mask to select specific bits from this copy for retransmission. This copying approach allows the system to efficiently generate retransmission code words without re-encoding, while the pre-calculated mask ensures the selected bits maintain optimal channel capacity distribution for the target code rate.
Data Source
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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, when a HARQ technology is used for data retransmission, channel capacity of all bits used for carrying user data in a code word for initial transmission and a code word for retransmission are the largest in the code words. Therefore, decoding performance of the code words can be improved.