Bit Mapping Across Constellation Layers for Priority-Aware FEC
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Solution Overview
Problem
Existing forward error correction (FEC) schemes in wireless communication, such as LDPC encoding, do not adequately account for factors like reliability or priority, leading to high rate loss and sub-optimal performance.
Innovation Solution
Implementing combined encoding schemes that leverage aspects of parallel and concatenated encoding, where different sets of systematic and parity bits are mapped to different layers of a constellation based on priority, using cascaded or non-cascaded concatenation layers, and allocating higher priority bits to more reliable layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional FEC schemes like LDPC encoding are used, then encoding can be performed, but reliability and priority factors are not accounted for, leading to high rate loss
Solution Approach 1:
The patent segments the encoded bit stream into multiple layers based on reliability and priority characteristics. Systematic bits and parity bits are separated into different layers, with higher priority bits assigned to more reliable transmission layers. This segmentation allows differential protection and handling of critical versus non-critical data portions.
Solution Approach 2:
The patent applies local quality by assigning different reliability characteristics to different portions of the encoded data. Specific layers or subsets of bits are enhanced with higher reliability through selective mapping to more robust modulation schemes or redundancy levels, rather than applying uniform reliability across all data.
2Productivity
If traditional FEC schemes like LDPC encoding are used, then encoding can be performed, but sub-optimal performance is achieved
Solution Approach 1:
The patent introduces an additional dimension to the encoding process by organizing bits into multiple layers with different reliability and priority characteristics. This layered structure adds a dimensional aspect to traditional FEC, enabling more sophisticated error correction and resource allocation strategies that improve overall system performance.
Solution Approach 2:
The patent changes key parameters of the encoding and transmission process, including the organization of systematic and parity bits into different layers, the assignment of priority levels to different bit streams, and the mapping of these layers to transmission resources. These parameter changes enable optimized error correction performance.
3Reliability
If bits are mapped to different layers of constellation based on priority, then successful reception and decoding is improved, but decoding complexity increases
Solution Approach 1:
The patent segments the bit stream into multiple layers that can be independently decoded. This segmentation allows the receiver to process different priority levels separately, potentially decoding higher priority layers first or independently, which can reduce overall decoding complexity compared to processing all bits uniformly.
Solution Approach 2:
The layered structure acts as an intermediary between the encoded data and the decoding process. By organizing bits into distinct layers with clear priority and reliability assignments, the patent creates an intermediate structure that simplifies the decoding logic and enables more efficient error correction strategies.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. An encoding device may obtain a first set of coded bits by encoding multiple sets of information bits in accordance with a parallel encoding scheme. The encoding device may obtain a second set of coded bits by using some or all of the first set of coded bits to encode a second set of information bits in accordance with a concatenated encoding scheme. The encoding device may map at least the second set of coded bits to different layers of a constellation based on a first priority associated with the first set of coded bits and a second priority associated with the second set of coded bits. Accordingly, the encoding device may transmit a signal associated with the second set of coded bits based on modulating the signal in accordance with the mapping.