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Nowadays, Wi-Fi devices are ubiquitous in our lives. Casually open the home wireless routing management interface, there may be no less than 10 Wi-Fi devices online at the same time. The increase in the number of devices leads to network congestion, performance degradation, increased delay and other problems. These problems became more serious in the era of Wi-Fi 5 (802.11 ac). Therefore, when designing Wi-Fi 6 (802.11 ax), experts made improvements and innovations specifically for the problem of network congestion. So, what new technologies does Wi-Fi 6 use to improve wireless channel capacity? When the user equipment receives the AP signal, it will compare whether the color it receives is consistent with the current associated AP color. When the color is the same, the user will think that the signal is the signal in the cell. If the color of the received signal is different from that of the associated AP, the user determines that the signal belongs to the interference signal. As shown in the following figure, due to the use of different color codes, the channel 1 of the green cell is no longer interfered by the adjacent cell channel 1 (blue and red).
Then, as demand for cars picks up in the fall of 2020, Toyota Denso Renesa plans to order 28nm semiconductors from TSMC again, but there is no room to produce in-car semiconductors because TSMC lines are occupied by other semiconductors. Although the inventory in the autumn and winter of 2020 exceeded the limit, by 2021, inventory had bottomed out, coupled with the shortage of 28nm semiconductors, cars could not be made. 28nm is the last generation of planar transistors (FinFET from 16 / 14nm to 3D) (2) do not use self-aligned double pattern (SADP) (will use SADP from FinFET) (3) Renesas vertical integration (integrated equipment manufacturer IDM), for example, outsource production to FinFET from this generation. In short, 28nm semiconductors produced by TSMC and other contract factories have a good performance-to-price ratio, so many electronic devices, including automobiles, use this semiconductor. At the invitation of the Japanese government, the TSMC Kumamoto plant, which will begin operation in 2024, will also mainly produce such 28nm semiconductors.
SoC (SystemonChip): refers to a system on a chip, that is, integrating multiple electronic systems into a single chip, which can process digital signals, analog signals, and even mixed signals, and is often used in embedded systems. SoC is a system-level chip, which has the characteristics of high integration of MCU and supercomputing power of MPU, that is, it has built-in RAM and ROM and is as powerful as MPU. The SoC can store and run system-level code, that is, it can run an operating system (mainly LinuxOS). It can be compared in this way: MCU is only a chip-level chip, while SoC is a system-level chip. It integrates the advantages of MCU and MPU, that is, it has built-in RAM and ROM and is as powerful as MPU.
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