Wireless Base Station Mapping and Symbol Interleaving Under Fading
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Solution Overview
Problem
Existing radio communication technologies face challenges in suppressing error rate performance degradation due to fading, particularly in multi-antenna transmission systems, where high-speed data transmission is required with low computational complexity, and conventional bit interleaving methods are inadequate for mobile terminals.
Innovation Solution
A transmitting method and apparatus that perform encoding and bit interleaving using convolutional encoding with multiple coding rates, where bits from different encoded data are arranged across multiple symbols, allowing for flexible modulation methods and reduced computational complexity through a combination of mapping and symbol interleaving processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bit interleaving is used in multi-antenna transmission, then error correction capability is improved, but device complexity increases and processing speed decreases
Solution Approach 1:
The patent divides the bit interleaving process into two independent stages: (1) block-level interleaving that distributes encoded blocks across multiple antennas, and (2) symbol-level interleaving that distributes bits within each symbol across frequency subcarriers. This segmentation allows each stage to operate independently with reduced complexity compared to traditional full-bit interleaving, while maintaining error correction capability through distributed transmission.
Solution Approach 2:
The patent implements continuous transmission by eliminating the need for complete bit-level interleaving before transmission. Instead, encoded blocks are directly mapped to symbols and transmitted continuously across multiple antennas and frequency subcarriers, maintaining uninterrupted data flow and reducing processing delays while preserving error correction through the multi-dimensional distribution scheme.
2Productivity
If higher 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 extends error protection from the traditional time domain to multiple dimensions: spatial distribution across multiple antennas, frequency distribution across subcarriers, and block-level distribution across encoded blocks. This multi-dimensional approach ensures that fading effects in any single dimension do not cause burst errors, enabling higher order modulation to be used safely while maintaining reliability.
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.