How far is WiFi 7 from us?

发布时间:2022-03-11 文章来源: 阅读量:341
Professional provider: explosion-proof wireless bridge AGV wireless communication PLC wireless communication mesh self-organized network explosion-proof wireless APThe maximum bandwidth of 30Gbps, support for 16 spatial streams, and latency of less than 5ms are the performance indicators defined by the WiFi 7 technology working group. In the past year or so, from chip manufacturers to terminal device manufacturers, WiFi 7 products have been introduced one after another, and a new generation of standards seems to be within reach. On the basis of the WiFi 6 standard, WiFi 7 has introduced many new technologies, mainly reflected in supporting a maximum bandwidth of 320MHz: limited and congested spectrum in the 2.4GHz and 5GHz frequency bands without authorization. Existing Wi Fi inevitably encounters low QoS issues when running emerging applications such as VR/AR. In order to achieve a maximum throughput of no less than 30Gbps, WiFi 7 will continue to introduce the 6GHz frequency band and add new bandwidth modes, including continuous 240MHz, discontinuous 160+80MHz, continuous 320 MHz, and discontinuous 160+160MHz. Support for Multi RU mechanism: In WiFi 6, each user can only send or receive frames on a specific RU assigned to them, greatly limiting the flexibility of spectrum resource scheduling. To address this issue and further improve spectral efficiency, WiFi 7 defines a mechanism that allows multiple RUs to be allocated to a single user. Of course, in order to balance the complexity of implementation and spectrum utilization, the protocol imposes certain restrictions on the combination of RU, that is, small specification RU (RU less than 242 Tone) can only be merged with small specification RU, and large specification RU (RU greater than or equal to 242 Tone) can only be merged with large specification RU, and mixing of small specification RU and large specification RU is not allowed. The introduction of higher order 4096-QAM modulation technology: The highest modulation mode of WiFi 6 is 1024-QAM, in which the modulation symbols carry 10 bits. In order to further improve the speed, WiFi 7 will introduce 4096-QAM, allowing modulation symbols to carry 12 bits. Under the same encoding, WiFi 7's 4096-QAM can achieve a 20% rate increase compared to WiFi 6's 1024-QAM. Supporting more data streams and enhancing MIMO functionality: In WiFi 7, the number of spatial streams has increased from 8 to 16, theoretically increasing the physical transmission rate by more than twice. Supporting more data streams will also bring more powerful features&ndash& Flash; Distributed MIMO means that 16 data streams can be provided by multiple access points simultaneously, rather than by a single access point. This means that multiple APs need to work together. In the past few years, WiFi has been continuously improving, adapting, and evolving, with increased speed, performance optimization, and expanding usage scenarios. For the demand for wireless connectivity, on the one hand, it is evolving towards high bandwidth and low latency, and on the other hand, it is also necessary to reduce interference and have better stability. After the large-scale application of WiFi6, users' requirements for wireless network performance are further improving, and the era of WiFi7 is approaching. Based on the optimized combination of delay, speed and capacity, WiFi7 will become the core of cutting-edge application scenarios such as Extended Reality (XR), Metauniverse, social games and edge computing. WiFi7 enables faster connections. The available spectrum of WiFi is increasing, and the spectrum bandwidth is also expanding. At present, the characteristics of 160MHz bandwidth are already covered in the 5GHz and 6GHz spectra. With the introduction of WiFi7, support for 240MHz or even 320MHz bandwidth has been added. And the advanced 4K QAM modulation and demodulation technology can provide higher throughput as much as possible in limited bandwidth. A major technical feature of WiFi 7 is the use of multi connection technology, which allows all data to be transmitted simultaneously or alternately. In scenarios where 5GHz and 6GHz spectra are superimposed, the system where the phone and router are located can achieve higher throughput, and of course, the system can also selectively connect. WiFi7 also has the ability to adaptively connect. For example, the innovative solution of "Pre amble Puncturing" supports AP access points to use continuous channels while not being affected by the aforementioned interference.