Modulated Sounding Frame Sequence for Multi-Mode Channel Measurement
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Solution Overview
Problem
Current HE-LTF and EHT-LTF sequences in WLANs are limited to BPSK modulation, unable to accurately measure channel quality in various modulation modes such as QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM, and 4096-QAM, restricting their application scenarios.
Innovation Solution
Generating a sounding frame with a predefined sequence modulated using QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM, and 4096-QAM modulation modes, which includes a sequence obtained after modulating a second sequence, allowing for accurate channel quality measurement across these modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If HE-LTF sequence or EHT-LTF sequence under BPSK modulation is used to measure channel quality, then distortion is small and PAPR is low, but channel quality can only be accurately measured under BPSK modulation
Solution Approach 1:
The patent changes the modulation parameter of the training sequence from BPSK to include QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM, and 4096-QAM. By modifying the modulation mode parameter, the training sequence can accurately measure channel quality across multiple modulation scenarios while maintaining controlled distortion and PAPR through optimized sequence design
Solution Approach 2:
The patent makes the training sequence universal across multiple modulation modes. Instead of having separate training sequences for different modulation types, a single training sequence design can be used for BPSK, QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM, and 4096-QAM measurements, enriching the application scenarios of HE-LTF and EHT-LTF sequences
2Reliability
If training sequence components are limited to +1, 0, or -1 values, then PAPR is low and distortion is small, but the sequence cannot accurately measure channel quality in higher-order modulation modes
Solution Approach 1:
The patent changes the value parameter range of the training sequence components. Instead of being limited to {-1, 0, +1}, the sequence components can take values corresponding to higher-order modulation constellations (e.g., 16-QAM has 16 possible values, 64-QAM has 64 possible values). This parameter expansion enables accurate channel quality measurement for higher-order modulations while controlling distortion through optimized sequence construction
Data Source
AI summary
This application provides a sounding frame transmission method and a related apparatus. The method is applied to a first device, and the method includes: generating a sounding frame, where the sounding frame includes a first field, the first field includes a predefined first sequence, the first sequence includes a sequence obtained after a second sequence is modulated by using at least one of the following modulation modes, and the modulation modes include: QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM, and 4096-QAM; and sending the sounding frame. In this way, channel quality of a communication link in at least one of modulation modes of QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM, and 4096-QAM can be accurately measured when channel measurement is performed by using the first sequence, thereby enriching application scenarios of an EHT-LTF sequence.