NUC Bit Interleaving Pattern for Lower Wireless Bit Error Rates
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Solution Overview
Problem
Current technologies lack effective bit interleaving methods suitable for non-uniform constellation modulation methods, such as 64NUC, which hampers communication performance in wireless transmission.
Innovation Solution
A data processing apparatus and method that includes a mapping unit for generating a second bit sequence, an inter-symbol interleaving unit for generating a third bit sequence, and an intra-symbol interleaving unit for shifting bits according to a specific pattern, enabling bit interleaving suitable for NUC modulation, with a modulation unit for wireless transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bit interleaving methods designed for uniform constellation (64QAM) are applied to non-uniform constellation (64NUC) modulation, then the system can maintain compatibility with existing protocols, but communication performance deteriorates due to mismatched bit shifting patterns that do not account for unequal signal point distances
Solution Approach 1:
The patent modifies the bit shifting parameter in intra-symbol interleaving from the conventional value (half the number of bits per symbol) to a new value optimized for NUC modulation. Specifically, for 64NUC, the shifting amount is changed from 3 bits to 2 bits, which aligns the bit mapping with the non-uniform signal point distances on the complex plane, thereby improving communication performance while maintaining the overall interleaving structure
Solution Approach 2:
The patent introduces dynamic adaptability by providing different bit shifting patterns for different modulation types. The system dynamically selects the appropriate shifting amount based on the modulation scheme being used (e.g., 2 bits for 64NUC, 3 bits for 64QAM), allowing optimal performance for each specific modulation type while maintaining protocol compatibility
2Reliability
If bit interleaving is performed with fixed shifting patterns optimized for uniform constellation, then the implementation remains simple and consistent, but error resistance performance worsens when applied to non-uniform constellation modulation
Solution Approach 1:
The patent changes the shifting parameter from a fixed value optimized for uniform constellation to a modified value suitable for non-uniform constellation. The intra-symbol interleaving shifting amount is adjusted from 3 bits (for 64QAM) to 2 bits (for 64NUC), which better matches the robustness characteristics of bits in NUC modulation and improves error resistance
Solution Approach 2:
The patent segments the bit sequence processing into distinct stages with different shifting amounts for different modulation types. By separating the interleaving into inter-symbol and intra-symbol stages with independently optimized parameters, the system achieves better error resistance for NUC while keeping each stage's implementation relatively simple
3Reliability
If the bit shifting amount in intra-symbol interleaving is reduced to accommodate NUC modulation characteristics, then communication performance improves, but the robustness distribution across bits becomes more complex to manage
Solution Approach 1:
The patent simplifies bit shifting management by establishing clear parameter rules: for 64NUC modulation, the intra-symbol interleaving shifts 2 bits, and for 64QAM, it shifts 3 bits. This parameterization approach, while adapting to NUC characteristics, maintains operational simplicity through standardized shifting amounts for each modulation type
Data Source
AI summary
A data processing apparatus, a data processing method, and a program are disclosed. They improve communication performance by performing bit interleaving suitable for a modulation method that is a non-uniform constellation. One example of a data processing apparatus includes a mapping unit configured to generate a second bit sequence by mapping a first bit sequence to any symbol on a complex plane corresponding to a NUC modulation method, an inter-symbol interleaving unit configured to generate a third bit sequence by performing inter-symbol interleaving to the second bit sequence, an intra-symbol interleaving unit configured to generate a fourth bit sequence by performing intra-symbol interleaving for shifting M bits as a whole of the third bit sequence per a same number of M bits as the bit number M representing the symbol, and a modulation unit configured to wirelessly transmit the fourth bit sequence according to the NUC modulation method.