Professional provider: explosion-proof wireless bridge AGV wireless communication PLC wireless communication mesh self-organized network explosion-proof wireless APOver the past 20 years, WiFi has gradually become the most commonly used wireless connection technology. From common desktop terminals, mobile terminals, furniture appliances, to cars, WiFi can be seen everywhere, providing internet access services for billions of devices. The first generation of WiFi standard specifications emerged in the 1990s, when IEEE established an 802.11 group to be responsible for the development and development of WLAN protocols. IEEE introduced the first generation 802.11 protocol in June 1997. The first generation Wireless Local Area Network (WLAN) standard defined the physical layer to operate at 2.4GHz, with a maximum data transfer rate of 2 Mbps. The second generation WiFi standard specification 802.11a was released in 1999, and the IEEE working group defined the protocol at 5GHz, with a maximum data transfer rate of 54 Mbps. In the same year, the IEEE working group introduced the 802.11b standard defined at 2.4 GHz with a maximum transmission rate of 11 Mbps. In this year, the Wi Fi Alliance was also officially established. On WiFi chips, the first three companies to launch WiFi chips based on the 802.11a protocol were Cisco, Intersil (acquired by Renesa in 2016), and Atheros (acquired by Qualcomm in 2011).The third generation WiFi standard specification, 802.11g, was released in 2003. The IEEE working group used OFDM technology in the 802.11a protocol, which combines the 2.4GHz frequency band of 802.11b and the highest transmission rate of 54 Mbps in 802.11a to produce the 802.11g protocol. At the same time, starting from the third generation WiFi standard, the new standard will be compatible with the old version forward. Chip manufacturers have gradually launched WiFi chips that comply with the new protocol since July of that year. At that time, the main chip manufacturers were Broadcom, Texas Instruments, Agere, and Intersi, and Broadcom was the main supplier under the 802.11g protocol at that time. The fourth generation WiFi standard specification 802.11n (WiFi4) was released in 2009. With the development of the Internet and the emergence of streaming media, terminal devices have put forward higher requirements for the speed and stability of wireless connection technology. In the fourth generation standard, the IEEE working group introduced new concepts such as MIMO, wave velocity shaping, and double bandwidth (40MHz). MIMO and double bandwidth increase the maximum transmission rate, while wave velocity shaping increases the maximum transmission distance. 802.11n operates in the 2.4 GHz frequency band, with a maximum transmission rate of 600 Mbps using a 40Mhz bandwidth and 4 * 4 MIMO. WiFi4 chips are widely used in the Internet of Things market, such as smart homes or white batteries. WiFi 4 chips can be divided into traditional routing chips, chips used in conjunction with MCU, and SoC chips. The fifth generation WiFi standard specification 802.11ac (WiFi5) was released in 2013, and the IEEE working group once again expanded the RF bandwidth (increased to 160MHz, but chip manufacturers only implemented 80MHz bandwidth), introducing higher-order modulation technology (256-QAM), with transmission rates up to 1.73 Gbps. However, WiFi5 only runs in the 5GHz frequency band and does not support the 2.4GHz frequency band. As early as January 2012, Broadcom released its fifth generation WiFi chip in Taipei and received support from 14 device manufacturers, including LG, Asus, Huawei, ZTE, Youxun, and Microsoft. In 2015, IEEE released the Wave 2 phase of 802.11ac, which mainly improved the concurrent processing ability of multi user data and network resource utilization through MU-MIMO technology.The sixth generation WiFi standard specification 802.11ax (WiFi6) was released in 2015. With the rapid increase in the number of mobile terminals brought about by the mobile internet and the wider emergence of the Internet of Things in household life, the number of access devices in a single Wi Fi network is increasing. How to simultaneously connect more devices and ensure the user experience of different access devices has become a new challenge facing IEEE. WiFi6 supports both 2.4 GHz and 5 GHz dual frequency bands, designed to address the issue of reduced efficiency caused by more and more terminals accessing the network. WiFi6 has three major characteristics: high speed, low latency, and low power consumption. Upgrading the encoding method to 1024-QAM brings high speed. The application of OFDMA technology in WiFi 6 allows all users to transmit data simultaneously, reducing latency. In OFDM systems, once a large number of users simultaneously make data requests, it can cause network congestion. At the same time, the newly added uplink MU-MIMO in WiFi 6 improves the utilization of network resources when devices transmit data to routers. The newly introduced TWT technology in WiFi6 can automatically adjust the time for sending or receiving data based on the device's situation, while also increasing the device's sleep time, thereby reducing power consumption. The WiFi 6 chip is widely used in mobile WiFi, wireless routers, the Internet of Things, smart homes, and the AR/VR market. According to a report by Strategy Analytics, Qualcomm, Broadcom, and MediaTek have become the top three WiFi chip manufacturers in 2021. In terms of domestic manufacturers, Botong Integration has launched the world's first WiFi 6 IoT chip, BK7236. Lexin Technology has launched a 32-bit RISC-V SoC chip ESP32-C6 that combines WiFi 6 and Bluetooth 5 (LE). The International WiFi Alliance announced that certification for WiFi 6E will begin in January 2021. The main upgrade brought by WiFi 6E is focused on the addition of a 6 GHz frequency band, and more channels and spectrum resources will help alleviate channel congestion and improve the user experience under high concurrency conditions. The seventh generation WiFi standard specification 802.11be (WiFi7) was released at the end of 2022. The new standard further expands the bandwidth (up to 320 MHz) on the basis of the sixth generation, using updated 4096-QAM modulation technology to improve speed, and innovatively adopts new technologies such as Multi RU, Multi Link, and enhanced MU-MIMO. The arrival of WiFi 7 will meet users' needs for high-definition 4K/8K videos, VR/AR, low latency games, and remote collaborative work.