Irregular Data Mapping for Mobile Receiver Error Correction
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Solution Overview
Problem
Existing digital communication systems with time interleaving or subslicing are not optimal for mobile receivers due to fading effects caused by multipath and Doppler frequencies, as the regular structure of data blocks can match the temporal distance of fading, leading to incomplete data correction.
Innovation Solution
The proposed solution involves mapping error correction code encoded data blocks from multiple input streams onto a time-domain output stream with an irregular structure, breaking the regular mapping pattern to ensure that fading effects affect different data streams, allowing for improved error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a regular mapping structure is used for data blocks, then the transmission system is simple and easy to implement, but fading effects can match the temporal distance of data blocks causing incomplete error correction
Solution Approach 1:
The patent applies asymmetry by using different mapping structures for different data streams. Specifically, a first mapping structure is used for a first data stream while a second, different mapping structure is used for a second data stream. This asymmetric approach ensures that fading effects that may align with the regular structure of one data stream do not simultaneously align with the structure of another data stream, thereby improving error correction capability without requiring a completely complex irregular structure for all streams.
Solution Approach 2:
The patent segments the data transmission by dividing it into multiple data streams (first data stream, second data stream, etc.), each with its own mapping structure. This segmentation allows the system to handle fading effects differently for different streams, where some streams may use regular mapping structures while others use different structures, thus improving overall reliability without uniformly increasing complexity across the entire system.
2Reliability
If different mapping structures are used for different data streams, then error correction is improved by distributing fading effects, but the device complexity increases
Solution Approach 1:
The mapping apparatus implements asymmetry by configuring different mapping structures for different data streams. The first mapping structure differs from the second mapping structure, creating an asymmetric system that distributes fading effects across streams with different temporal patterns. This improves reception quality while keeping the complexity increase manageable by maintaining structured, repeatable patterns rather than completely irregular mappings.
Solution Approach 2:
The patent changes parameters of the mapping structure, specifically the temporal distance between data blocks and the mapping pattern, when transitioning from the first mapping structure to the second mapping structure. By adjusting these parameters differently for different data streams, the system improves error correction capability while maintaining controlled complexity through systematic parameter variation rather than arbitrary complexity.
Data Source
AI summary
The present invention relates to an apparatus and a corresponding method for mapping error correction code encoded time-domain data of at least two mapping input data streams (S1, S2, . . . , Sn) onto a time-domain mapping output data stream (Q) having a frame structure, comprising a data input (102) for receiving said at least two mapping input data streams (S1, S2, . . . , Sn) each being segmented into data blocks (D1, D2, . . . , DN) carrying error correction code encoded data, a data mapper (104) for mapping the data blocks (D1, D2, . . . , DN) of said at least two mapping input data streams (S1, S2, . . . , Sn) onto frames of said mapping output data stream (Q), each frame comprising a number of frame intervals (F1, F2, . . . , FM), wherein the data mapper (104) is adapted for mapping the data blocks (D1, D2, . . . , DN) onto said frame intervals such that each frame interval (F1, F2, . . . , FM) carries sequentially arranged data blocks (D1, D2, . . . , DN) from various mapping input data streams (S1, S2, . . . , Sn) and that within a frame the mapping of data blocks (D1, D2, . . . , DN) from the various mapping input data streams (S1, S2, . . . , Sn) onto frame intervals (F1, F2, . . . , FM) is different from frame interval to frame interval, and a data output (110) for outputting said mapping output data stream (Q).