Wireless Base Station Mapping Layout for Low-Complexity Fading Robustness
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Solution Overview
Problem
Current communication technologies face challenges in suppressing error rate performance degradation due to fading, particularly in multi-antenna systems, where high-speed data transmission is required with low computational complexity, and existing bit interleaving methods are inadequate for mobile terminals.
Innovation Solution
A transmitting method and apparatus that employs a combination of encoding, interleaving, and modulation processing, where encoded data is formed using different coding rates and arranged such that bits from multiple encoded data streams are interleaved across symbols, allowing for high-speed operation with reduced computational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bit interleaving is performed to suppress burst errors due to frequency selective fading, then error correction capability is improved, but computational complexity and processing time increase
Solution Approach 1:
The patent segments the encoded data into multiple groups and performs interleaving at the group level rather than individual bit level. This segmentation approach maintains error correction capability while reducing the computational burden by processing smaller units in parallel or sequentially with simpler operations.
Solution Approach 2:
The patent introduces a new dimension of interleaving by arranging bits in a two-dimensional array structure and performing interleaving operations along different dimensions (row-wise, column-wise, or diagonal). This dimensional approach achieves effective burst error suppression with simpler one-dimensional access patterns compared to traditional complex bit-level interleaving.
2Productivity
If high-order modulation is used to increase data transmission speed, then productivity is improved, but susceptibility to fading-induced burst errors increases
Solution Approach 1:
The patent performs interleaving operations on the encoded data before modulation is applied. This preliminary interleaving ensures that even if high-order modulation is used, the subsequent fading effects are distributed across multiple code groups, preventing concentrated burst errors and maintaining reliability at high data rates.
3Reliability
If encoded block size is increased to reduce burst error probability, then error correction capability is improved, but transmission time increases
Solution Approach 1:
The patent divides the encoded block into multiple smaller code groups that can be processed and transmitted in parallel or interleaved fashion. This segmentation maintains the effective constraint length for error correction while reducing the transmission time by avoiding the need to transmit one large block sequentially.
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.