Wireless Base Station Symbol Mapping for Low-Complexity Burst Error Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing communication systems face challenges in suppressing error rate performance degradation due to fading, particularly with high-speed data transmission in mobile terminals, where burst errors are common and conventional bit interleaving methods are complex and inefficient.
Innovation Solution
A transmitting method and apparatus that employs a combination of encoding, interleaving, and modulation processing to form symbols from multiple encoded data blocks with different coding rates, using convolutional encoding and symbol interleaving to distribute data across multiple symbols, thereby reducing computational complexity and enhancing error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bit interleaving methods are used to suppress burst errors, then error correction capability is improved, but device complexity increases
Solution Approach 1:
The patent segments the encoded data into multiple groups and distributes them across different symbols. Instead of complex bit-level interleaving, the method divides the encoded bit sequence into groups and assigns each group to a specific symbol, thereby reducing computational complexity while maintaining error correction capability against burst errors.
Solution Approach 2:
The patent transitions from one-dimensional bit interleaving to two-dimensional arrangement by organizing encoded data into groups and mapping them to different symbols in the time-frequency plane. This dimensional change simplifies the interleaving operation while effectively dispersing burst errors across multiple code blocks.
2Productivity
If high-order modulation is used to increase data transmission speed, then productivity is improved, but reliability deteriorates due to increased burst error probability
Solution Approach 1:
The patent divides the high-speed data stream into multiple encoded blocks, each processed independently through the group-based symbol mapping. This segmentation allows the system to maintain high transmission rates while each segment benefits from the error dispersal mechanism, reducing the impact of burst errors on the overall transmission.
Solution Approach 2:
The patent changes the mapping parameters by controlling which encoded groups are assigned to which symbols based on the modulation order. For high-order modulation, the system adjusts the group-to-symbol assignment to ensure adequate dispersion of encoded data, thereby maintaining reliability despite the higher data rate and inherent burst error susceptibility.
Data Source
AI summary
A transmitter apparatus wherein a simple structure is used to successfully suppress the degradation of error rate performance that otherwise would be caused by fading or the like. There are included encoding parts that encode transport data; a mapping part that performs such a mapping that encoded data sequentially formed by the encoding parts are not successively included in the same symbol, thereby forming data symbols; and a symbol interleaver that interleaves the data symbols. In this way, a low computational complexity can be used to perform an interleaving process equivalent to a bit interleaving process to effectively improve the reception quality at a receiving end.