PPDU Pilot Subcarrier Allocation for Lower WLAN Packet Error Rate
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Solution Overview
Problem
The high packet error rate in wireless local area networks (WLAN) using high frequency bands is a challenge, particularly when transmitting physical layer signals with increased carrier spacing, which affects chip design and implementation for next-generation WLAN protocols.
Innovation Solution
The solution involves optimizing the number of pilot subcarriers in the bandwidth of high frequency band PPDU to improve link performance and data demodulation accuracy, while reducing the number of data and guard subcarriers to enhance spectrum utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the carrier spacing of physical layer signal is increased to transmit high frequency band signal, then the chip design and implementation are simplified, but the packet error rate increases
Solution Approach 1:
The patent changes the parameter of pilot subcarrier quantity from the conventional fixed value to a variable value that adapts to different bandwidth configurations. By dynamically adjusting the number of pilot subcarriers based on the actual transmission bandwidth, the system maintains reliable frequency offset estimation capability while using efficient resource allocation, thereby reducing packet error rates in high frequency band transmissions.
2Reliability
If the number of pilot subcarriers is increased to reduce packet error rate, then link performance improves, but the number of data subcarriers decreases
Solution Approach 1:
The patent introduces a dynamic adjustment mechanism for pilot subcarrier quantity based on bandwidth conditions. The system automatically determines the optimal number of pilot subcarriers according to the actual transmission requirements, rather than using a fixed conventional value. This dynamic approach ensures sufficient pilots for reliable frequency offset correction in high frequency bands while maximizing data subcarrier utilization for maintaining transmission capacity.
3Measurement precision
If the number of pilot subcarriers is increased for frequency offset correction, then data demodulation accuracy improves, but the spectrum utilization decreases
Solution Approach 1:
The patent dynamically adjusts the number of pilot subcarriers as a variable parameter based on the transmission bandwidth and frequency offset correction requirements. By optimizing this parameter according to actual channel conditions, the system achieves sufficient frequency offset correction accuracy without unnecessarily increasing the total number of subcarriers, thereby maintaining efficient spectrum utilization.
Data Source
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Figure 2b
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AI summary
A communication method, a communication apparatus, and a communication system are provided, are applied to a wireless local area network system that supports the 802.11 series protocols, for example, a next-generation Wi-Fi protocol of IEEE 802.11ax, such as 802.11be, Wi-Fi 7, or EHT, for another example, a next-generation of 802.11be, such as 802.11bn or Wi-Fi 8, 802.11ay, or 802.11aj, and may be further applied to a UWB-based wireless personal area network system, a sensing (sensing) system, and the like. A first communication apparatus generates and sends a PPDU. Correspondingly, a second communication apparatus receives and parses the PPDU. A bandwidth for transmitting the PPDU may include 128 subcarriers, and a quantity of pilot subcarriers in the 128 subcarriers is greater than 6. A packet error rate is effectively reduced by using the foregoing method.