PBCH Polar Coding with Progressive Interleaving and Scrambling
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Solution Overview
Problem
The existing PBCH encoding/decoding method in LTE systems is not suitable for 5G communications, as it faces challenges in channel quality variations and timing confusion during polar code transmission.
Innovation Solution
A polar code encoding mode is applied to the PBCH, incorporating progressive interleaving and scrambling to avoid timing confusion and improve decoding success, especially in poor channel conditions, by using a transformation matrix and scrambling vectors to generate multiple transmission versions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If progressive interleaving and scrambling are applied to polar code encoding, then decoding accuracy is improved and timing confusion is reduced, but device complexity increases
Solution Approach 1:
The encoded sequence is divided into multiple segments through progressive interleaving, where each segment is scrambled independently using different scrambling vectors. This segmentation allows the receiver to process and decode segments separately, improving decoding accuracy through diversity while managing complexity through structured processing
Solution Approach 2:
The interleaving and scrambling operations are performed in advance during encoding, creating multiple versions of the encoded sequence with different scrambling sequences. This preliminary action ensures that when transmission occurs, the receiver already has pre-processed sequences that can be directly decoded without complex real-time processing
2Reliability
If multiple transmission versions are generated through scrambling, then reliability in poor channel conditions is improved, but loss of time increases due to additional processing
Solution Approach 1:
Different scrambling vectors are applied to create multiple transmission versions of the same encoded sequence. By changing only the scrambling parameter rather than re-encoding the entire sequence, the system generates diverse transmission versions quickly, improving reliability without excessive time penalty
Solution Approach 2:
The system generates multiple transmission versions periodically through systematic scrambling operations, where each version uses a different scrambling sequence. This periodic generation allows the receiver to combine multiple versions over time, improving reliability in poor channel conditions while maintaining efficient processing rhythm
Data Source
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AI summary
A polar code transmission method and apparatus are provided, to apply a polar code encoding mode to a PBCH. The method includes: performing, by a transmit end, polar code encoding on some or all of to-be-encoded bit sequences U to generate an encoded sequence, where a length of U is N; and scrambling and interleaving, by the transmit end, the encoded sequence by using a scrambling sequence Sx and an interleaving matrix Px.