OFDM Symbol Interleaving Switching for Error Correction Tradeoffs
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G technology, face challenges in efficiently managing bit-level and tone-level interleaving for OFDM symbols across code blocks, which affects error correction and resource utilization due to varying factors like bit load, processing time, and transmission schemes.
Innovation Solution
A method and apparatus for dynamically switching between bit-level and tone-level interleaving for each OFDM symbol based on factors such as bit load, MIMO transmission rank, modulation and coding schemes, and processing requirements, allowing for the selection of either interleaving technique or no interleaving, to optimize error correction and resource efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bit-level interleaving is applied to all OFDM symbols, then error correction performance is improved, but processing complexity and time consumption increase
Solution Approach 1:
The patent implements dynamic switching between bit-level interleaving and tone-level interleaving based on real-time channel conditions, modulation schemes, and code block sizes. The system adapts the interleaving method per OFDM symbol rather than using a fixed approach, allowing optimization of processing time while maintaining error correction performance when needed.
Solution Approach 2:
The patent applies different interleaving methods to different OFDM symbols based on their specific characteristics such as modulation scheme, code block size, and channel conditions. Instead of uniform bit-level interleaving across all symbols, the system selectively applies bit-level interleaving only where it provides necessary error correction benefits, reducing overall processing time.
2Reliability
If bit-level interleaving is used for all code blocks, then burst error resilience is improved, but device complexity increases
Solution Approach 1:
The system dynamically selects between bit-level and tone-level interleaving based on transmission conditions, avoiding the need for complex bit-level interleaving when tone-level interleaving suffices. This reduces device complexity while maintaining burst error resilience when required by channel conditions or modulation schemes.
Solution Approach 2:
The patent changes the interleaving parameter (method type) based on transmission conditions, modulation schemes, and code block characteristics. By adjusting this parameter dynamically, the system achieves burst error resilience only when necessary, reducing overall device complexity compared to always using bit-level interleaving.
3Loss of time
If tone-level interleaving is used instead of bit-level interleaving, then processing time is reduced, but error correction performance deteriorates
Solution Approach 1:
The system dynamically switches between tone-level and bit-level interleaving based on real-time assessment of error correction needs versus processing time requirements. When channel conditions or modulation schemes indicate high error risk, the system transitions to bit-level interleaving to maintain performance while otherwise using the faster tone-level approach.
Solution Approach 2:
The patent applies bit-level interleaving selectively to specific OFDM symbols that require enhanced error correction based on their local characteristics such as modulation scheme complexity, code block size, and channel quality. Other symbols use the faster tone-level interleaving, achieving local optimization of error correction without sacrificing overall processing efficiency.
4Adaptability or versatility
If dynamic switching between interleaving methods is implemented, then adaptability to different transmission conditions is improved, but control complexity increases
Solution Approach 1:
The patent implements dynamic switching by changing the interleaving method parameter based on transmission conditions, modulation schemes, and code block characteristics. This parameter-based control approach provides high adaptability while keeping control complexity manageable through rule-based selection rather than complex optimization algorithms.
Data Source
AI summary
The present disclosure provides techniques for performing bit-level interleaving for orthogonal frequency-divisional multiplexing (OFDM) symbols across a plurality of code blocks. In some aspects, a transmitting device may dynamically switch between bit-level interleaving and tone-level interleaving for each OFDM symbol based on factors such as number of bits that are carried in each tone, size of each code block, the processing time requirements of the transmitting device and/or the receiving device, or the transmitting device preference.