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OFDMA changed that. By composing subcarriers into resource units (RU), OFDMA channels can dynamically divide the instantaneous bandwidth to different users. OFDMA has suddenly increased the number of users that are instantly supported. The 20MHz bandwidth in the following figure is an example. Through subcarrier allocation, 20MHz can support up to 9 devices to access at the same time, 40MHz can support 18 devices, and so on. Fig. 2 uses the number of resource units available under OFDMA’s 20MHz% 0AWi-Fi 6 in which each subcarrier is 78.125khz. 20MHz is 256 subcarriers. 6 Edge indicates that there are 6 subcarriers as protection bands from the edge. ) It can be said that OFDMA has brought about a qualitative change in the capacity of Wi-Fi channels.
Due to the spread of the global COVID-19 epidemic in 2020, automobile production is in the doldrums (figure 1). The number of cars produced worldwide, which was 92.18 million in 2019 before the COVID-19 epidemic, fell by 14.56 million to 77.62 million in 2020 and appears to have fallen by 1.2 million to 76.42 million in 2021. The decline in car production in 0A2020 was caused by the COVID-19 epidemic, which led to a sharp drop in demand. However, the downturn in car production in 2021 is mainly due to a shortage of semiconductors. In fact, by 2021, the shortage of semiconductors has made it impossible to build cars, and the governments of Japan, the United States and Germany, with automobile as the core industry, have made requests to TSMC to increase the production of on-board semiconductors through the government of Taiwan. The semiconductors in short supply at that time were 28nm logic semiconductors and MCU (Micro Controller Units, commonly known as “microcontrollers”).
System on Chip, referred to as Soc, is also a system on a chip. In a narrow sense, it is the chip integration of the core of the information system, which is to integrate the key components of the system on one chip; in a broad sense, SoC is a micro-miniature system. If the central processing unit (CPU) is the brain, then the SoC is It is the system that includes the brain, heart, eyes, and hands. Academic circles at home and abroad generally tend to define SoC as the integration of microprocessor, analog IP core, digital IP core, and memory (or off-chip memory control interface) on a single chip, which is usually customized or oriented for specific purposes. standard product.
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