Wi-Fi 6 technical analysis/ Wallys

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Since the advent of Wi-Fi technology in 1997, although the bandwidth is only 1Mbit/s~2Mbit/s, this connection mode makes people get rid of the bondage of wired connection, and with its convenient and effective characteristics, it has become the preferred way for people to suRF the Internet. In the next decade, 802.11a, 802.11b and 802.11n emerged one after another. Until the appearance of 802.11ac in 2014, people have been committed to improving the transmission rate of the network from the initial 2Mbit/s to 1.73Gbit/s. In addition to the increase in transmission rate,Wi-Fi also introduces wider RF bandwidth (up to 160MHz) and higher modulation technology (256-QAM).

In recent years, due to the rapid development of wireless technology and smart home, more and more devices have appeared in the home wireless network. In addition to the traditional equipment of computers and mobile phones, wireless audio, network TV, camera and other new smart home appliances have also appeared in people's lives. Online education and 4K high-definition, AR, VR and other new industries have also joined the wireless network. People enjoy the convenience brought by the network, but also put forward higher requirements for the network. The wireless infrastructure that runs on the traditional Wi-Fi standard (802.11a/b/g/n/ac) cannot cope with the increasing number of WLAN terminals and the increasing bandwidth demand. Therefore, it is urgent to introduce a new generation of Wi-Fi technology. 802.11ax comes into being at this moment.
Devices can no longer cope with the increase in the number of WLAN terminals and the increase in bandwidth demand, so it is urgent to introduce a new generation of Wi-Fi technology,802.11ax comes into being. 802.11ax has been under development since May 2013. The draft standard was developed by the IEEE Standards Institute's TGax Working Group, which was established in May 2014 and completed D2.0 in November 2017, D3.0 in May 2018, and D5.0 in October 2019. As of now, the latest version This is D6.0.
With the evolution of the Wi-Fi standard, the Wi-Fi Alliance organization WFA selects a digital number to rename each generation of Wi-Fi standard to facilitate Wi-Fi users and device manufacturers to know the device connection or supported Wi-Fi standard. Wi-Fi6 is short for 802.11ax.
1024QAM
Quadrature Amplitude Modulation (QAM) is quadrature amplitude modulation, which converts the data signal "01" into radio waves. The purpose of QAN is to enable signals to transmit enough information at once by modulating raw data. Wi-Fi 6 supports 1024QAM, or 2 to the 10th bit, up 25% from Wi-Fi 5's 256QAM (2~8th 8bit).
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ODFMA
ODFMA is called orthogonal frequency division multiple access technology. The purpose of this technology is to divide the transmission loan into a series of orthogonal, non-overlapping subcarrier sets, and assign different subcarrier sets to different users, so as to realize the purpose of connecting more users. In contrast, each user in traditional ODFMA occupies the whole channel frequency, which leads to user queuing and network information congestion. The advantage of ODFMA lies in the segmentation of frequency band in terms of time and bandwidth, accommodating more users while ensuring transmission rate.
ODFMA transmits data to multiple users at the same time through channel partitioning, which greatly improves the transmission under multi-user conditions. In terms of specific products, in Wi-Fi6, the number of carriers on the 20MHz signal channel is increased to 256, among which 234 transmit data, and the rest are system communication and verification information, which can support a large number of users and meet the communication needs of existing customers.
To illustrate the progress of this technology, we can think of the wireless data transmission technology as a trucking model. The goods to be carried are data. On the Wi-Fi5 router, no matter how big or small the goods are, we use fixed size trucks to transport them. But on an OfDMA-enabled Wi-Fi6 router, a single van can be packed together in several different sizes, making full use of the van space and reducing this waste. Professionally speaking, Wi-Fi 6 allows multiple mobile terminals to be connected at the same time for data transmission, thus saving transportation space and improving efficiency. It is because of such functions that the terminal will choose the sub-channel with good wireless performance to centrally send power communication, so it also has the characteristics of expanding coverage area and improving coverage quality
MU-MIMO: Multi-user multi-input and multi-output. MU-MIMO supports data sending and receiving by multiple users at the same time.
Before MU-MIMO appeared, routers only supported Single User multiple-input multiple-output protocol. In this protocol, the signal of the router was single, and it ranked the communication distance between the terminal and the host in order to realize the network connection of multiple devices. In this case, if one device needs to transfer data in a familiar way, the other devices may be stuck. Even worse, if multiple devices are connected at the same time, the communication efficiency of multiple devices may be affected. MU-MIMO signals are sorted in three dimensions of time, frequency band and space at the same time, which is equivalent to having three signals communicate with devices. In this way, there are more channels to connect to the network, and queuing and delay are greatly reduced.

In fact, Wi-Fi 5 already uses 4×4 MU-MIMO downlink. What is more valuable is that the MU-MIMO supported by Wi-Fi6 is increased on the basis of the previous MU-MIMO, and the upstream and downstream links can support up to 8×8 MU-MO. Compared with Wi-Fi 5, The capacity of the downlink is increased by two times and the capacity of the uplink by eight times, greatly increasing the total wireless access capacity.

Wallys communication (suzhou) co., LTD. (http://www.wallystech.com, which is a focus on wireless communications product design, manufacture, and provide high quality OEM/ODM/JDM professional service providers. As professional manufacturers and exporters of these products in China, we sincerely wish to establish business relations with you. Company main development Quacomm chip on the high power wireless products, such as ipq6000 / IPQ6018 IPQ6010 / IPQ4019 / IPQ4029 / IPQ8072 / IPQ8074 / QCN9074, etc.

Getaway

芯片的内部的结构很详细