Polar Channel Coding With Unequal Protection for Weak Sub-Channels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Polar codes in wireless communication systems experience varying Bit Error Rates (BERs) due to different sub-channel capacities, necessitating effective utilization of redundant bits to improve decoding performance.
Innovation Solution
A method is introduced where bits in a first bit block are used to generate bits in a second bit block, with the channel coding based on polar codes, allowing for unequal error protection by determining redundancy based on sub-channel reliability, thereby improving transmission reliability on weaker sub-channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional uniform error protection is applied to all bits in polar codes, then the system complexity remains low, but bits on sub-channels with weaker reliability experience higher error rates
Solution Approach 1:
The patent applies local quality by differentiating error protection levels for different bits based on their sub-channel reliability. Bits are classified into different types (first type bits with stronger protection, second type bits with weaker protection) according to their channel capacity characteristics, allowing each bit to receive appropriate protection tailored to its specific reliability requirements rather than uniform protection for all bits
Solution Approach 2:
The patent segments the bit sequence into different types based on sub-channel reliability characteristics. By dividing bits into first type bits (mapped to sub-channels with stronger reliability) and second type bits (mapped to sub-channels with weaker reliability), the system can apply different error protection strategies to different segments, improving overall reliability without uniformly increasing complexity across all bits
2Reliability
If stronger error protection is provided to all bits, then transmission reliability improves, but the overhead of redundant bits increases
Solution Approach 1:
The patent applies local quality by providing differentiated error protection where first type bits (on more reliable sub-channels) receive stronger protection with more redundant bits, while second type bits (on less reliable sub-channels) receive weaker protection with fewer redundant bits. This localized approach optimizes the balance between reliability improvement and redundant bit overhead by matching protection levels to actual channel conditions for each bit position
Solution Approach 2:
The patent changes the parameter of redundancy level based on bit type and sub-channel characteristics. By dynamically adjusting the number of redundant bits allocated to each bit position according to its reliability requirements, the system achieves optimal decoding performance while minimizing total redundant bit overhead, rather than applying a fixed high redundancy level to all bits
Data Source
AI summary
The present disclosure discloses a method and a device in a User and a base station used for channel coding. A first node determines a first bit block; performs channel coding; and transmits a first radio signal. Bits in the first bit block are used to generate bits in a second bit block. The bits in the first bit block and in the second bit block are used for an input to the channel coding, an output after the channel coding is used to generate the first radio signal. Channel coding is based on a polar code. A sub-channel occupied by a target first type bit is related to the number of bits in the second bit block related to the target first type bit. The target first type bit belongs to the first bit block. The disclosure can improve decoding performance of polar codes and reduce complexity of decoding.