Symbol Interleaving Across Antennas for Low-Complexity Fading Control
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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 separating bits into different groups based on their position in the encoded block, then distributing these groups to different antennas. This segmentation transforms a single complex interleaving operation into multiple simple sorting operations, reducing computational complexity while maintaining error correction capability.
Solution Approach 2:
The patent performs preliminary grouping of bits according to their positions before the actual interleaving process. By pre-organizing bits into groups based on their indices modulo the number of antennas, the system prepares the data structure in advance, which simplifies subsequent distribution operations and reduces real-time computational burden.
2Productivity
If higher order modulation is used to increase data transmission speed, then productivity is improved, but the number of symbols required decreases, making the system more susceptible to burst errors from fading
Solution Approach 1:
The patent extends the interleaving operation from a single-dimensional time sequence to a multi-dimensional structure that includes both time and antenna dimensions. By distributing bits across multiple antennas and time slots in a structured manner, the system achieves diversity in both dimensions, protecting against burst errors while maintaining high transmission speeds enabled by higher order modulation.
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 (11—1-11—4) that encode transport data; a mapping part (3304) that performs such a mapping that encoded data sequentially formed by the encoding parts (11—1-11—4) are not successively included in the same symbol, thereby forming data symbols; and a symbol interleaver (3301) 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.