Wireless Base Station Bit Mapping Across Symbols for Fading Robustness
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Solution Overview
Problem
Existing 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 employs a combination of encoding, interleaving, and modulation processing, where encoded data is convolutionally encoded with varying coding rates, and bits are arranged across multiple symbols to form one symbol, allowing for high-speed operation with reduced computational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bit interleaving methods are used in multi-antenna transmission systems, then error correction capability is improved, but computational complexity increases and processing speed decreases
Solution Approach 1:
The patent segments the bit interleaving process into multiple simpler stages: first performing block interleaving on coded bits, then performing permutation based on antenna port and subcarrier indices. This segmentation transforms a single complex interleaving operation into multiple manageable steps that can be executed efficiently with reduced computational complexity while maintaining error correction capability.
Solution Approach 2:
The patent extends the interleaving process from a single dimension to multiple dimensions by incorporating antenna port indices, subcarrier indices, and OFDM symbol indices into the permutation operation. This multi-dimensional approach distributes bits across space (antennas), frequency (subcarriers), and time (OFDM symbols), achieving diversity gain without requiring complex single-dimension interleaving.
2Reliability
If conventional bit interleving methods are used, then burst errors are suppressed, but processing speed decreases which is inadequate for mobile terminals
Solution Approach 1:
The patent performs block interleaving on coded bits before the permutation step, preparing the bit sequence in advance with a simple regular pattern. This preliminary action organizes bits in a structured manner that facilitates the subsequent fast permutation operation, enabling burst error suppression through the combination of preliminary block interleaving and final multi-dimensional permutation without compromising processing speed.
3Productivity
If high-speed data transmission is implemented, then productivity is improved, but error rate performance degradation due to fading increases
Solution Approach 1:
The patent achieves both high-speed transmission and error rate improvement by extending diversity to multiple dimensions: spatial diversity through antenna ports, frequency diversity through subcarriers, and time diversity through OFDM symbols. This multi-dimensional distribution of transmitted bits provides robustness against fading in any single dimension while maintaining high data transmission rates through efficient use of all available dimensions.
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.