WLAN Transmitter Bit Mapping for Broadband Decoding Reliability
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Solution Overview
Problem
In wireless local area network (WLAN) systems, increasing the size of the interleaver to support larger frequency bands leads to increased complexity and burden on existing structures, potentially deteriorating decoding performance due to contiguous bits having 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 over a smaller frequency band. This segmentation achieves frequency diversity gain equivalent to a large interleaver while keeping individual interleaver sizes manageable, thus resolving the contradiction between reliability improvement and device complexity.
2Reliability
If the size of the interleaver is increased to support larger frequency bands, then the coding gain is improved, but the burden on changing existing structure increases
Solution Approach 1:
The transmission is segmented into multiple frequency subblocks that can be independently processed through existing interleaving structures. This allows coding gain to be achieved across the entire frequency band without requiring a single large interleaver, thereby reducing the burden on changing existing structures while maintaining coding gain.
Solution Approach 2:
The parsed frequency subblocks can be processed using existing interleaver designs, making the system universal and compatible with current structures. Each subblock utilizes standard interleaving techniques, allowing the system to support larger frequency bands without requiring entirely new structural implementations.
3Ease of manufacture
If contiguous bits are assigned to the same axis of signal constellation, then the encoding process is simplified, but the decoding performance deteriorates due to same reliability across contiguous bits
Solution Approach 1:
Different segments of the coded block are mapped to different axes or positions in the signal constellation, creating local variations in reliability characteristics. This ensures that contiguous bits do not all have the same reliability, improving decoding performance while maintaining relatively simple encoding processes through structured mapping.
Solution Approach 2:
The mapping process utilizes multiple dimensions of the signal constellation (different axes and positions) to distribute contiguous bits across varied reliability levels. By transitioning from a single-axis mapping to multi-dimensional mapping, the system improves decoding performance without significantly 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.