Encoded Bit Mapping and Symbol Interleaving for Fading Channels
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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 encoded data streams to form symbols, 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 device complexity and computational complexity increase
Solution Approach 1:
The patent divides the bit interleaving process into multiple stages: first performing block interleaving on encoded data blocks, then performing permutation interleaving on the arranged bits. This segmentation allows each stage to handle a specific aspect of error suppression, achieving effective error correction while keeping individual processing steps computationally manageable for mobile terminals.
Solution Approach 2:
The patent performs block interleaving as a preliminary action before permutation interleaving. By first arranging bits in blocks according to encoded data boundaries, the system prepares the data structure in advance, making the subsequent permutation operation more efficient and reducing the overall computational burden during high-speed transmission.
2Productivity
If high-speed data transmission is implemented in mobile terminals, then productivity is improved, but error rate performance degradation due to fading increases
Solution Approach 1:
The patent employs dynamic interleaving patterns that adapt to different transmission conditions. The permutation interleaving stage can vary its arrangement pattern based on channel characteristics, allowing the system to maintain high transmission speeds while dynamically adjusting error protection strategies to counteract fading effects in real-time.
Solution Approach 2:
The patent combines multiple interleaving techniques (block interleaving + permutation interleaving) into a composite error correction scheme. This composite approach integrates the strengths of different methods: block interleaving provides structured error distribution, while permutation interleaving adds additional randomness and protection, together achieving robust error rate performance at high transmission speeds.
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.