QAM Rate Matching With RV-Based Interleaver Switching
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in rate matching and channel interleaving that affect the integrity and efficiency of quadrature amplitude modulation (QAM) bit transmission, leading to potential disruptions in communication quality and reliability.
Innovation Solution
The implementation of a method that configures and enables/disables channel interleavers based on redundancy versions (RVs) for QAM bits stored in circular buffers, transferring them to amplitude and sign bit buffers to preserve the integrity of shaped constellations, ensuring accurate mapping to modulation symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel interleaving is applied to QAM bits in circular buffers, then communication reliability is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent changes the parameter of channel interleaving from enabled to disabled based on probabilistic shaping configuration. When probabilistic shaping is used, the channel interleaver is disabled, avoiding the complexity of interleaving operations while maintaining communication reliability through the probabilistic shaping technique itself, which optimizes the bit distribution in the constellation diagram.
Solution Approach 2:
Instead of applying channel interleaving to improve reliability, the patent inverts the approach by disabling channel interleaving when probabilistic shaping is used. The reliability improvement is achieved through the probabilistic shaping mechanism rather than through interleaving, thus eliminating the need for complex interleaving operations.
2Device complexity
If channel interleaving is disabled for probabilistic shaping, then device complexity is reduced, but potential disruptions in communication quality may occur
Solution Approach 1:
The patent changes the modulation parameter to match the probabilistic shaping configuration. When probabilistic shaping is enabled, the system uses a modulation parameter that is compatible with the shaped constellation, ensuring that the disabled channel interleaver does not cause communication quality degradation. This parameter adjustment maintains reliability while reducing complexity.
Solution Approach 2:
The system uses feedback from the probabilistic shaping configuration to determine whether to enable or disable channel interleaving. This feedback mechanism ensures that the channel interleaver is disabled only when probabilistic shaping is active, preventing communication quality disruptions while minimizing device complexity.
3Reliability
If channel interleaving is applied to all redundancy versions, then communication reliability is improved, but processing time and energy consumption increase
Solution Approach 1:
The patent inverts the conventional approach by disabling channel interleaving for certain redundancy versions when probabilistic shaping is used. This eliminates the time-consuming interleaving operations for these versions while maintaining reliability through the probabilistic shaping technique, thus reducing processing time without sacrificing communication reliability.
Solution Approach 2:
The patent changes the channel interleaving parameter based on the redundancy version and probabilistic shaping configuration. For specific redundancy versions used with probabilistic shaping, the channel interleaving is disabled, reducing processing time while maintaining reliability through the shaped modulation scheme.
4Reliability
If channel interleaving is enabled for QAM bits, then communication reliability is improved, but energy consumption increases
Solution Approach 1:
The patent inverts the approach by disabling channel interleaving when probabilistic shaping is used, thereby reducing energy consumption. The reliability improvement is achieved through the probabilistic shaping mechanism rather than through interleaving, eliminating the need for energy-intensive interleaving operations while maintaining communication reliability.
Solution Approach 2:
The patent changes the channel interleaving parameter based on the probabilistic shaping configuration. When probabilistic shaping is enabled, channel interleaving is disabled, reducing energy consumption while maintaining reliability through the shaped modulation scheme that optimizes bit distribution in the constellation diagram.
Data Source
AI summary
Aspects present herein relate to methods and devices for wireless communication including an apparatus, e.g., a UE and/or a base station. The apparatus may encode a plurality of bits associated with QAM, the plurality of bits corresponding to a circular buffer associated with at least one RV, the plurality of bits including a plurality of systematic bits. The apparatus may also transfer the plurality of bits from the circular buffer associated with the at least one RV to a first buffer and a second buffer. Additionally, the apparatus may map the plurality of bits from the first buffer and the second buffer to a plurality of modulation symbols.