Time-Varying Coded Modulation for Failed Block Reconstruction
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Solution Overview
Problem
In block-fading channels, variable block lengths make it difficult to reconstruct data bits when a block fails during transmission, as the distribution of data bits across blocks can lead to incomplete recovery of useful data.
Innovation Solution
Implementing time-varying coded modulation across blocks, where each block receives a constant number of data bits, ensuring that missing data bits from a failed block can be evenly distributed and reconstructed through outer decoding, using a combination of coding and modulation forms to achieve a time-varying information rate matching the block-specific data symbol count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If variable block lengths are used in frequency hopping transmission, then interference immunity is improved, but data reconstruction reliability deteriorates when blocks fail during transmission
Solution Approach 1:
The encoded data stream is segmented into multiple blocks, each containing an equal number of data bits. This segmentation ensures that when frequency hopping is applied with variable block lengths, each block maintains a consistent data bit count that can be reliably reconstructed even if transmission fails, while still benefiting from the interference immunity provided by variable-length transmission at different frequencies
Solution Approach 2:
The invention changes the parameter of block length in frequency hopping transmission while maintaining a constant number of data bits per block. This parameter change allows the system to vary transmission characteristics for interference immunity while preserving the structural integrity needed for reliable data reconstruction through outer decoding
2Reliability
If constant data bits per block are used with time-varying block lengths, then data reconstruction is improved, but transmission rate variability increases
Solution Approach 1:
The system dynamically adjusts block lengths in frequency hopping transmission while maintaining a constant number of data bits per block. This dynamic approach allows transmission rate to vary with channel conditions and interference patterns, optimizing reliability without sacrificing overall productivity through adaptive rate control
Data Source
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AI summary
The method involves assigning the to-be-transmitted data bits in the individual blocks of data symbols. The time-varying data bits are created in the individual blocks by time-varying encoded modulation of the assigned data bits. Equal number of data bits is assigned to each data block. Several code words are packed into an associated single data symbol on a carrier of the respective block. The individual blocks of data symbols are summarized into data streams (W1-WN). Independent claims are included for the following: (1) method for reconstruction of data stream blocks of data symbols; (2) device for creation of data stream; and (3) device for reconstruction of data stream blocks.