Joint Symbol Demapping and Decoding for UWB BLER Gain
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Solution Overview
Problem
The decoding performance of Ultra Wide Band (UWB) wireless communication technology needs improvement, particularly in handling symbol mapping and decoding processes that assume independence between coded bits, leading to performance losses.
Innovation Solution
A joint demapping and decoding method that calculates likelihood values for each symbol based on the received symbol, considering the joint determination of coded bits during symbol mapping, thereby obtaining branch metrics directly, without increasing computational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional separate demapping and decoding methods are used, then the processing is simpler, but the decoding performance deteriorates due to assuming independence between coded bits
Solution Approach 1:
The patent merges the demapping and decoding processes into a unified joint processing framework. The branch metric calculation in the Viterbi decoder is modified to incorporate demapping operations, allowing the decoder to process multiple coded bits jointly rather than independently. This integration eliminates the performance loss caused by independence assumptions while maintaining computational efficiency through shared processing structures.
2Reliability
If joint demapping and decoding is implemented, then decoding performance improves, but computational complexity increases
Solution Approach 1:
The patent changes the parameter representation in the branch metric calculation from individual bit-level log-likelihood ratios to symbol-level joint metrics. By modifying the branch metric computation to directly process the received symbol and calculate metrics for multiple coded bits simultaneously, the method achieves joint processing without proportionally increasing computational complexity. The key insight is that the same received symbol can serve multiple decoding purposes at once.
Data Source
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AI summary
A joint de-mapping and decoding method and apparatus, a decoder, an integrated circuit, a device, and equipment, applied to the technical field of digital signal processing. A received symbol comprising a plurality of components is first acquired, wherein each component of the received symbol is jointly determined by a plurality of encoded bits involved in symbol mapping; when state transition is performed during a decoding process, a likelihood value of each symbol value is computed on the basis of the value of the received symbol, and branch metrics of each state transition branch is obtained on the basis of the likelihood values.