Polar-Code Interleaving Layout for Low-Latency Modulation
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Solution Overview
Problem
The increasing number of user equipment (UEs) and data volume in wireless communication systems pose challenges in efficiently using limited radio resources, leading to performance deterioration due to high latency and modulation order effects, especially when polar codes are used for channel coding.
Innovation Solution
A method involving a polar code-based transmission system with an interleaver having an odd number of columns, where bits are cyclically read out from specific columns to improve data transmission efficiency and reduce latency, while preventing performance deterioration associated with modulation order.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polar codes are used for channel coding, then error correction performance is improved, but latency increases due to large code size requiring interleaving
Solution Approach 1:
The patent segments the polar code into multiple sub-blocks and processes them in parallel through multiple interleavers, dividing the large code processing task into smaller manageable units that can be handled simultaneously, thereby reducing overall latency while maintaining error correction performance
Solution Approach 2:
The patent dynamically adjusts the number of interleavers and sub-block sizes based on code length and modulation order, optimizing the processing pipeline to balance between thorough error correction and minimal latency for different transmission conditions
2Reliability
If interleaver is used for polar code bits, then performance deterioration due to modulation order is prevented, but latency increases
Solution Approach 1:
The patent divides the bit sequence into multiple sub-blocks that are processed by parallel interleavers, reducing the time each bit spends in the interleaving process while collectively maintaining the full interleaving effect needed for modulation performance
Solution Approach 2:
The patent combines multiple parallel interleaving operations into a unified processing pipeline where multiple interleavers work simultaneously on different sub-blocks, merging their outputs to achieve the same performance as a single large interleaver but with reduced latency
3Productivity
If the number of user equipment and data volume increases, then communication capacity is improved, but efficient use of limited radio resources becomes difficult
Solution Approach 1:
The patent changes key parameters including interleaver size, number of parallel interleavers, and sub-block segmentation based on modulation order and code length, optimizing resource utilization for different traffic conditions and user equipment densities
Solution Approach 2:
The patent implements dynamic resource allocation where the interleaving structure adapts to current system conditions, adjusting the balance between parallel processing degree and interleaver size to efficiently manage radio resources under varying load conditions
Data Source
AI summary
A transmission apparatus: encodes information into a first bit sequence, using a polar code; outputs a second bit sequence by inputting the first bit sequence to an interleaver; modulates the second bit sequence into modulation symbols according to a modulation order; and transmits the modulation symbols. The interleaver: has an odd number of columns; and is configured to cyclically read and output, from column k, bits stored in row n of the interleaver, and cyclically read and output, from column k+a, bits stored in row n+1 of the interleaver, wherein a represents an integer which is not 0.