FEC Resource Block Mapping for Efficient SIC Decoding
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Solution Overview
Problem
Conventional forward error correction (FEC) designs in wireless communications hinder efficient successive interference cancellation (SIC) decoding due to non-independently decodable resource blocks, requiring receivers to decode unnecessary data when transmissions do not precisely overlap.
Innovation Solution
The implementation of enhanced FEC techniques that generate independently decodable resource blocks through multiple FEC coding modules and high-ratio inward-peering parity bits, allowing for efficient SIC decoding by enabling each resource block to be decoded independently without relying on other blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional FEC designs distribute FEC bits throughout all resource blocks, then error correction capability is improved, but SIC decoding efficiency deteriorates because receivers must decode all RBs even when transmissions do not overlap
Solution Approach 1:
The patent segments the FEC coding process into multiple independent modules (first FEC coding module and second FEC coding module), where each module processes specific resource blocks independently. This segmentation allows receivers to selectively decode only the resource blocks containing interfering signals, rather than evaluating all resource blocks, thereby improving SIC decoding efficiency while maintaining error correction capability through the coordinated operation of multiple FEC modules.
2Reliability
If FEC bits are distributed across all resource blocks, then coding redundancy is improved, but computational load increases when transmissions do not precisely overlap
Solution Approach 1:
The patent applies local quality by assigning different FEC coding characteristics to different resource block groups. The first FEC coding module handles resource blocks where transmissions overlap, while the second FEC coding module handles resource blocks where transmissions do not overlap. This localized differentiation ensures that computational resources are concentrated only where needed (in overlapping regions), reducing overall computational load while maintaining adequate coding redundancy in each local region.
3Measurement precision
If all resource blocks are evaluated for SIC decoding, then decoding accuracy is improved, but processing time increases
Solution Approach 1:
The patent implements preliminary action by pre-organizing resource blocks into distinct groups handled by different FEC coding modules before transmission. The receiver can preliminarily identify which FEC module corresponds to which resource block group, allowing it to skip evaluation of resource blocks that do not contain interfering signals. This preliminary organization maintains decoding accuracy for relevant blocks while significantly reducing processing time by avoiding unnecessary evaluations.
Data Source
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AI summary
Forward Error Correction (FEC) techniques that generate independently decodable resource blocks are beneficial for Successive Interference Cancellation (SIC) demodulation. One FEC technique for generating independently decodable resource blocks includes mapping locally decodable FEC codeblocks into unique resource blocks such that substantially all of the bits of the FEC codeblock are carried within a single resource block. The locally decodable FEC codeblocks can be generated from different FEC encoding modules or from a common FEC encoding module. Another technique for generating independently decodable resource blocks includes encoding a stream of information bits into low-density parity-check (LDPC) codeblocks having high ratios of inward peering parity bits. These high ratios of inward peering parity bits allow substantial portions of each LDPC codeblock to be decoded independently from information carried by other LDPC codeblocks.