Channel Interleaver Mapping for Equal-Protection Code Block Decoding
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Solution Overview
Problem
In communication systems, particularly in LTE, transmitting multiple code blocks faces challenges in maintaining good channel estimation performance and fast decoding due to inadequate reference signals, leading to interference and reduced decoding probability.
Innovation Solution
An improved channel interleaver design that maps coded bits from multiple code blocks to modulation symbols, ensuring each code block receives roughly equal protection, and allows for the reconstruction and cancellation of successfully decoded code blocks to reduce interference, enabling faster decoding and improved channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple code blocks are transmitted to improve data throughput, then productivity increases, but decoding probability decreases due to interference and inadequate reference signals
Solution Approach 1:
The patent segments the transmitted signal into multiple code blocks, each with its own reference signals. This allows the receiver to decode blocks independently using local reference signals, reducing the impact of interference from other blocks and maintaining high decoding probability while enabling parallel processing to improve throughput.
Solution Approach 2:
The patent introduces separate reference signals as intermediaries for each code block. These reference signals act as mediators that enable accurate channel estimation and decoding for each block independently, reducing the harmful interference effect between multiple transmitted code blocks.
2Productivity
If reference signals are reduced to increase spectral efficiency, then productivity increases, but channel estimation performance deteriorates
Solution Approach 1:
The patent segments reference signals to be co-located with each code block, allowing each block to have its own dedicated reference signals. This segmentation enables accurate channel estimation for each block using local reference signals, maintaining measurement precision while reducing the total reference signal overhead compared to having reference signals for the entire transmission.
3Measurement precision
If code blocks are decoded sequentially to maintain accuracy, then measurement precision is preserved, but speed decreases due to waiting for all reference signals
Solution Approach 1:
The patent segments the transmission into independent code blocks with co-located reference signals, enabling parallel decoding of multiple blocks. Each block can be decoded independently using its own reference signals without waiting for other blocks, thereby improving decoding speed while maintaining accuracy through local channel estimation.
Solution Approach 2:
The patent places reference signals before their associated code blocks in the time-frequency grid. This preliminary positioning allows the receiver to perform channel estimation using the reference signals before decoding the subsequent code blocks, enabling fast and accurate decoding without waiting for other blocks.
Data Source
AI summary
A method includes separating resource elements from multiple code blocks into different groups, and decoding the code bits of the resource elements within each group without waiting for a completed reception of a transport block to start decoding.A method includes separating coded bits from multiple code blocks into different groups, and decoding the code blocks containing coded bits within each group. A first CRC is attached to the transport block and a second CRC is attached to at least one code block from the transport block.An improved channel interleaver design method including mapping from coded bits of different code blocks to modulation symbols, and mapping from modulation symbols to time, frequency, and spatial resources, to make sure each code block to get roughly the same level of protection.