PBCH Polar Decoding With Reliability-Based Bit Mapping
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Solution Overview
Problem
Current polar coding methods for physical broadcast channels (PBCH) in wireless communications systems do not fully optimize transmission reliability, as they do not effectively differentiate between various types of information bits based on reliability, leading to suboptimal encoding and decoding processes.
Innovation Solution
A method is introduced where polar coding for PBCH involves mapping cyclic redundancy check (CRC) bits and predictable information bits to specific reliability positions within the polar code, based on ascending order of reliability, to enhance transmission reliability by ensuring that critical bits are encoded with higher reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polar coding is applied to PBCH without differentiating information bit reliability, then encoding complexity is kept low, but transmission reliability is insufficient
Solution Approach 1:
The patent applies local quality by differentiating treatment for different types of information bits based on their reliability characteristics. CRC bits are mapped to high-reliability positions while other information bits are mapped to low-reliability positions in the polar code, creating localized quality differentiation that optimizes overall transmission reliability without requiring complete redesign of the encoding system
Solution Approach 2:
The patent segments information bits into different categories (CRC bits and other information bits) with different reliability requirements, and separately maps them to different reliability positions in the polar code. This segmentation allows targeted optimization of reliability for critical bits while maintaining manageable encoding complexity
2Reliability
If critical bits are encoded with higher reliability positions, then transmission reliability improves, but decoding complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-determining the reliability characteristics of different information bit types and establishing their mapping to specific polar code positions before encoding. The receiver uses this same reliability information to guide the decoding process, performing polar decoding followed by CRC verification. This preliminary arrangement of reliability information simplifies the decoding complexity compared to dynamic reliability assessment
Data Source
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Figure 3
Figure 3a
AI summary
Embodiments of this application provide a method for coding in a wireless communication network. A communication device interleave a first bit sequence to obtain a first interleaved sequence having sequence number starting with a sequence number of 0, wherein the first bit sequence comprises bits for indicating timing, wherein the bits for indicating timing comprises a set of bits for indicating synchronization signal block index (SSBI); wherein the set of bits for indicating SSBI are placed in positions indicated by sequence numbers of 2, 3 and 5 in the first interleaved sequence. The devices then add d a first CRC bits on the first interleaved sequence to obtain a second bit sequence, then interleave on the second bit sequence according to an interleave pattern to obtain a second interleaved sequence, and finally polar encode the second interleaved sequence to obtain the encoded sequence.