PPDU Modulation Signaling for Multi-Stream Bit Overhead Control
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently indicating non-uniform modulation schemes for multiple spatial streams, leading to inefficiencies in throughput and complexity in protocol implementation.
Innovation Solution
A communication method and apparatus that uses a small number of bits to indicate different modulation schemes, limiting the difference between modulation bits of adjacent schemes to ensure efficient modulation and demodulation, thereby simplifying the protocol and supporting non-uniform modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-uniform modulation schemes are used for multiple spatial streams, then transmission throughput is improved, but the number of bits required to indicate modulation schemes increases
Solution Approach 1:
The modulation schemes are segmented into groups based on their bit differences. The indication method segments the W modulation schemes into multiple groups, where each group contains modulation schemes with controlled bit differences. This allows efficient indication by selecting from predefined groups rather than indicating each scheme independently.
Solution Approach 2:
The patent changes the parameter of bit difference threshold between modulation schemes. By setting a maximum bit difference constraint, the system dynamically adjusts which modulation schemes can be combined in non-uniform modulation, balancing throughput optimization with indication efficiency.
2Adaptability or versatility
If many modulation schemes are supported for multiple spatial streams, then adaptability is improved, but protocol complexity increases
Solution Approach 1:
The protocol divides the large set of W modulation schemes into smaller groups based on bit difference characteristics. This segmentation reduces the complexity of indicating modulation schemes while maintaining support for diverse modulation types across multiple spatial streams.
Solution Approach 2:
The indication mechanism is designed to be universal, supporting both uniform and non-uniform modulation schemes through a unified framework. The same indication structure handles different modulation types (QAM, PSK) and different numbers of spatial streams, reducing the need for separate protocol rules.
3Adaptability or versatility
If adjacent modulation schemes have large bit differences, then modulation flexibility is improved, but demodulation reliability decreases
Solution Approach 1:
The patent dynamically controls the bit difference parameter between adjacent modulation schemes in the indicated set. By constraining the maximum bit difference, the system ensures that selected modulation schemes have comparable complexity and performance characteristics, maintaining demodulation reliability while allowing flexibility through different valid combinations.
Solution Approach 2:
The system uses feedback from channel conditions to select appropriate modulation scheme combinations. The indication mechanism allows the transmitter to adaptively choose from valid groups of modulation schemes based on observed channel quality, ensuring reliable demodulation while maintaining flexibility.
Data Source
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AI summary
A communication method and apparatus are provided, are applied to the field of communication technologies, may be applied to a wireless local area network system supporting 802.11 series protocols such as a next-generation Wi-Fi protocol of IEEE 802.11ax like 802.11be, Wi-Fi 7, or EHT, and 802.11bn, Wi-Fi 8, UHR, Wi-Fi AI, or millimeter wave (MMW), and may be further applied to a WPAN system, a sensing system, and the like supporting UWB. A first communication apparatus generates a PPDU, and sends the PPDU. A second communication apparatus receives the PPDU, and parses the PPDU. The PPDU includes first indication information. The first indication information may indicate a first modulation scheme set and a coding rate. The first modulation scheme set is one of N modulation scheme sets obtained through classification based on W modulation schemes. Q modulation schemes in the first modulation scheme set are used to modulate the PPDU.