Multiantenna Transmitter Interleaving for Burst Error Suppression
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Solution Overview
Problem
In radio communications, the use of LDPC codes for error correction leads to increased burst errors as the number of modulation multi-values increases, and multi-antenna transmission systems face degradation in error rate performance due to distance from the preamble, requiring complex encoder reconfiguration and reduced separation precision.
Innovation Solution
A transmitting apparatus that employs block encoding, modulation, and interleaving to distribute data symbols across multiple encoded blocks, allowing for simple configuration maintenance and uniform error rate performance without changing block size, even with varying modulation multi-values, and improves separation precision across antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the number of modulation multi-values is increased, then data transmission speed is improved, but burst error probability increases
Solution Approach 1:
The patent divides the encoded block into multiple segments and distributes data symbols across multiple encoded blocks through interleaving. This segmentation prevents concentration of errors within a single block, thereby suppressing burst errors while maintaining high transmission speed through higher-order modulation schemes.
Solution Approach 2:
The patent introduces a new dimension of distribution by placing data symbols from a single encoded block across multiple encoded blocks in the time domain. This dimensional transformation disperses the impact of fading notches and burst errors, allowing higher modulation orders to be used without proportionally increasing error probability.
2Reliability
If the encoded block size is increased to suppress burst errors, then reliability is improved, but encoder complexity increases
Solution Approach 1:
The patent implements dynamic interleaving patterns that adapt to different modulation schemes without requiring reconfiguration of the encoder block size. The interleaver dynamically distributes symbols across blocks based on the current modulation order, maintaining simple encoder architecture while achieving burst error suppression through flexible symbol arrangement.
Solution Approach 2:
The patent changes the interleaving parameters and distribution patterns according to modulation scheme rather than changing the encoder block size. This allows the system to maintain fixed, simple encoder configurations while adapting error suppression characteristics by modifying how symbols are distributed across blocks during the interleaving stage.
3Reliability
If data is transmitted sequentially from multiple antennas, then spatial diversity is improved, but separation precision degrades with distance from preamble
Solution Approach 1:
The patent applies preliminary interleaving and distribution of data symbols across multiple encoded blocks before transmission. This preliminary arrangement ensures that data from each encoded block is spread across multiple time instances and antennas, maintaining uniform separation precision throughout the transmission period while preserving spatial diversity benefits.
Solution Approach 2:
The patent ensures that each local segment (encoded block) contributes data symbols distributed across the entire transmission sequence. This creates uniform local quality characteristics throughout the transmission, preventing degradation of separation precision at any particular time or antenna while maintaining overall spatial diversity.
Data Source
AI summary
A transmitter apparatus wherein a relatively simple structure is used to suppress burst errors without changing the block sizes of encoded blocks even when the number of modulation multi-values is increased. An encoding part subjects transport data to a block encoding process to form block encoded data. A modulating part modulates the block encoded data to form data symbols; and an arranging (interleaving) part arranges(interleaves) the block encoded data in such a manner that the intra-block encoded data of the encoded blocks, which include their respective single different data symbol, get together, and then supplies the arranged(interleaved) block encoded data to the modulating part. In this way, there can be provided a transmitter apparatus wherein a relatively simple structure is used to suppress burst errors without changing the block sizes of encoded blocks even when the number of modulation multi-values is increased.