'C:\Users\LR\AppData\Local\Temp\HZ$D.086.2595\HZ$D.086.2596\内部报表202312\[003-202312内部报表.xlsx]主要科目'!$O4 公式中!$O4 代表什么

时间: 2024-04-03 19:30:10 浏览: 48

Draft P802.11ax_D6.0

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### IEEE P802.11ax_D6.0: High Efficiency Wireless LAN Enhancements The IEEE P802.11ax_D6.0 draft standard, released in November 2019, represents an amendment to the IEEE 802.11 REVmd/D3.0 standard. This amendment introduces significant enhancements aimed at improving the efficiency and performance of wireless local area networks (WLANs), specifically addressing high-density environments where multiple devices need to share limited bandwidth effectively. #### Key Features and Enhancements 1. **Introduction to 802.11ax**: The draft standard is designed to provide high-efficiency WLAN capabilities by improving spectral efficiency, reducing latency, and enhancing the overall performance of wireless networks in dense deployment scenarios. It builds upon the previous standards, such as 802.11ac, but with specific focus on increasing network capacity and efficiency. 2. **PHY Layer Enhancements**: - **Orthogonal Frequency-Division Multiple Access (OFDMA)**: OFDMA allows for more efficient use of the frequency spectrum by dividing it into smaller subcarriers that can be allocated to individual devices. This feature significantly improves the utilization of available bandwidth, especially in crowded environments. - **Multi-User Multiple Input Multiple Output (MU-MIMO)**: The standard enhances MU-MIMO capabilities, enabling simultaneous data transmission to multiple devices, thereby increasing the overall throughput and reducing congestion. - **1024-QAM Modulation Scheme**: To achieve higher data rates, 802.11ax introduces a more advanced modulation scheme (1024-QAM) that increases the amount of information transmitted per symbol compared to 256-QAM used in 802.11ac. 3. **MAC Layer Enhancements**: - **Target Wake Time (TWT)**: TWT is a new feature that allows devices to schedule their "wake-up" times, reducing energy consumption by minimizing the time spent listening for incoming traffic. - **Enhanced Traffic Management**: The MAC layer improvements include better traffic management mechanisms, allowing for more efficient scheduling and prioritization of data transmissions. - **BSS Coloring**: Basic Service Set (BSS) coloring is introduced to reduce interference in dense deployments. This mechanism assigns a color to each BSS, and devices only transmit on their assigned color, helping to mitigate co-channel interference. 4. **Performance Improvements**: - **Increased Network Capacity**: The combination of OFDMA and MU-MIMO technologies significantly increases the capacity of the network, allowing for more concurrent users and devices without sacrificing performance. - **Improved Latency**: By allocating smaller chunks of bandwidth (subcarriers) to devices, OFDMA helps reduce latency, which is particularly beneficial for applications requiring real-time interactions like voice and video calls. - **Extended Range**: Enhanced transmission techniques improve the range of wireless signals, making it easier to cover larger areas with fewer access points. 5. **Energy Efficiency**: - **Power Consumption Reduction**: The introduction of Target Wake Time (TWT) helps reduce power consumption by enabling devices to enter sleep mode when not actively transmitting or receiving data. - **Battery Life Extension**: For battery-powered devices such as smartphones and IoT sensors, the reduced power consumption translates into longer battery life, making the technology more suitable for a wide range of applications. #### Compliance and Adoption It is important to note that the document is an unapproved draft subject to change. As such, it must not be utilized for any conformance or compliance purposes until it has been finalized and officially approved by the IEEE. Permission is granted for IEEE Standards Committee participants to reproduce this document for purposes of international standardization consideration. Entities seeking permission to reproduce this document, in whole or in part, must obtain permission from the IEEE Standards Activities Department. #### Conclusion The IEEE P802.11ax_D6.0 draft standard represents a significant leap forward in wireless networking technology, addressing the challenges posed by high-density environments. With its advanced features such as OFDMA, MU-MIMO, and TWT, 802.11ax promises to deliver improved performance, increased capacity, and better energy efficiency. These enhancements make it ideal for use in densely populated areas, including offices, schools, airports, and other public venues, ensuring that the next generation of wireless networks is capable of handling the growing demand for high-speed connectivity.

在公式'C:\Users\LR\AppData\Local\Temp\HZ$D.086.2595\HZ$D.086.2596\内部报表202312\[003-202312内部报表.xlsx]主要科目'!$O4中，'!$O4'代表Excel工作表中的单元格引用。其中，'!'表示引用的是同一工作簿中的单元格，'$O4'表示引用的是第4行、第15列的单元格。$符号表示该列的引用是绝对的，不会随着公式的拖动而改变。因此，'!$O4'表示引用的是同一工作簿中第4行、第15列的单元格。

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