Wireless Data Block Mapping for Wideband Decoding Reliability
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Solution Overview
Problem
In wireless communication systems, particularly in WLANs, increasing the size of the interleaver to support larger frequency bands leads to increased complexity and burden on existing structures, which can deteriorate decoding performance by causing contiguous bits to have the same reliability on the signal constellation.
Innovation Solution
A method and transmitter that determine the number of bits assigned to a single axis of a signal constellation and use multiple encoders to generate coded blocks, which are then parsed into frequency subblocks using a round robin scheme to ensure diverse reliability across the signal constellation, thereby supporting broadband transmission without increasing the interleaver size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the size of the interleaver is increased to support larger frequency bands, then the frequency diversity gain and coding gain are improved, but the device complexity and burden on existing structures increase
Solution Approach 1:
The coded block is divided into multiple frequency subblocks through parsing, where each subblock is independently interleaved. This segmentation allows the system to achieve frequency diversity across the entire bandwidth without requiring a single large interleaver, thereby reducing complexity while maintaining reliability.
Solution Approach 2:
Instead of increasing the interleaver size in one dimension (single large interleaver), the patent introduces a new dimension by creating multiple smaller interleavers that process different frequency subblocks. This dimensional transformation achieves the same frequency diversity effect with reduced individual interleaver complexity.
2Reliability
If the size of the interleaver is increased to support larger frequency bands, then the coding gain is improved, but the ease of operation deteriorates due to burden on existing structures
Solution Approach 1:
The patent segments the coding process into multiple independent encoding operations on smaller subblocks. This allows existing coding structures to operate at their optimal size without being burdened by the need to handle entire wideband signals, thereby maintaining coding gain while improving ease of operation.
Solution Approach 2:
The parsing and subblocking mechanism provides a universal framework that can be applied to different bandwidth configurations without changing the fundamental interleaver structure. This multi-functionality allows the same interleaver design to serve multiple bandwidth requirements, reducing the burden on existing structures.
3Ease of manufacture
If contiguous bits are assigned to the same reliability level on the signal constellation, then the ease of encoding is improved, but the reliability of decoding deteriorates
Solution Approach 1:
The patent applies different reliability characteristics to different portions of the coded block by parsing it into frequency subblocks. Each subblock experiences different channel conditions and reliability levels, ensuring that no single reliability level dominates the entire transmission. This local differentiation improves decoding performance while maintaining encoding simplicity.
Solution Approach 2:
By segmenting the coded block into multiple frequency subblocks with different reliability characteristics, the patent prevents contiguous bits from all having the same reliability. This segmentation ensures diversity in reliability levels across the transmission, improving decoding performance without complicating the encoding process.
Data Source
AI summary
Provided are a transmitter and a method for transmitting a data block in a wireless communication system. The method comprises the following steps: deciding the number of bits (s) and encoders (NES) to allocate to one axis of a signal constellation; encoding an information bit based on the s and the NES and generating a coded block; parsing the coded block based on the s and the NES and generating a plurality of frequency sub-blocks; and transmitting the plurality of frequency sub-blocks to a receiver.