Wireless Transmitter Constellation Mapping for Broadband WLAN Decoding
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Solution Overview
Problem
Existing wireless communication systems face challenges in supporting broadband transmission in wireless local area networks (WLANs) due to increased complexity and burden when enlarging the size of the interleaver, which can deteriorate decoding performance by maintaining continuous reliability on signal constellations.
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 varied reliability across signal constellations, thereby supporting wider bandwidths without increasing interleaver size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the size of the interleaver is increased to support a larger frequency band, then coding gain and diversity gain are improved, but device complexity and structural burden increase
Solution Approach 1:
The patent divides the coded block into multiple frequency subblocks and processes them separately through parallel encoding paths. This segmentation allows the system to support larger frequency bands by distributing the interleaving burden across multiple smaller subblocks rather than requiring a single large interleaver, thus maintaining coding and diversity gains while reducing overall device complexity
Solution Approach 2:
The patent introduces a new dimension of processing by parsing coded blocks into frequency subblocks along the frequency dimension. This dimensional transformation allows the system to handle larger bandwidths by adding frequency-based parallelism rather than simply scaling up the interleaver size in the time domain, effectively decoupling bandwidth support from interleaver complexity
2Reliability
If the size of the interleaver is increased to maximize interleaving effect, then frequency diversity gain is improved, but ease of operation and implementation become more difficult
Solution Approach 1:
The patent segments the frequency band into multiple subblocks, each processed by smaller interleavers. This segmentation maintains the frequency diversity effect across the entire band while making each individual interleaving operation simpler and more manageable, thus improving ease of implementation without sacrificing diversity gain
Solution Approach 2:
The patent combines multiple parallel encoding and interleaving paths to achieve the overall interleaving effect. By merging several smaller, easier-to-implement interleavers operating in parallel on frequency subblocks, the system achieves the same frequency diversity gain as a single large interleaver would provide, but with reduced operational complexity
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.