PBCH Polar Coding with Puncturing for Lower Decoder Complexity
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Solution Overview
Problem
Current methods for transmitting a Physical Broadcast Channel (PBCH) in wireless communication systems, particularly in 5G networks, face challenges in efficiently encoding and transmitting data due to high complexity in encoder/decoder processes, which affects communication performance.
Innovation Solution
The method involves generating and transmitting encoded data bits for each symbol of a predetermined subframe using a polar code, with a polar encoder configured to handle varying data sizes by puncturing bits when necessary, specifically utilizing a mother code size of 512 and transmitting 384 encoded data bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional encoding methods are used for PBCH transmission, then the transmission can be performed with standard procedures, but the encoder/decoder complexity becomes high which affects communication performance
Solution Approach 1:
The patent changes the coding parameters by using a polar code with mother code size N=512 and information size K=48, achieving a coding rate of 48/512. This specific parameter configuration reduces decoder complexity while maintaining reliable PBCH transmission, directly resolving the contradiction between reliability and device complexity
Solution Approach 2:
The PBCH transmission is segmented into two symbols within a predetermined subframe, with each symbol carrying encoded data bits generated using the polar code. This segmentation allows the encoding process to be divided into manageable parts, reducing the overall computational burden and complexity of the encoder/decoder while maintaining transmission reliability
2Quantity of substance
If the mother code size of polar encoder is increased to ensure sufficient encoded bits, then the encoding capacity is improved, but the complexity of processing increases
Solution Approach 1:
The patent generates 512 encoded data bits using the polar encoder but only transmits 384 bits, puncturing 128 bits. This partial action approach provides sufficient encoded bits for reliable transmission while avoiding the excessive processing complexity that would result from transmitting all 512 bits, effectively balancing quantity and complexity
3Productivity
If puncturing is applied to reduce the number of transmitted bits, then the transmission efficiency is improved, but the encoding process becomes more complex
Solution Approach 1:
The puncturing operation is performed in advance during the encoding process, selecting which 384 out of 512 encoded bits to transmit before the actual transmission occurs. This preliminary action simplifies the overall process by pre-determining the transmitted bits, making the encoding process more manageable and efficient rather than adding complexity during transmission
Data Source
AI summary
A method by which a base station transmits a physical broadcast channel (PBCH) can comprise the steps of: generating the same encoded data bit for each of two symbols of a predetermined subframe for PBCH transmission by using a polar code; and transmitting the generated same encoded data bit from each of the two symbols of the predetermined subframe through the PBCH.