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In the past Wi-Fi technology, intercell co-channel interference (Co-Channel Interference,CCI) is another important factor affecting channel capacity. The core of CSMA/CA is to listen before you speak (listen before talk,LBT). The device monitors the wireless channel first and sends data without being occupied. In the case of multi-AP mesh networking (AP,Access Point, wireless access point), the equipment in the cell will listen to the interference signal of the cell adjacent to the same channel, causing the device to mistakenly think that the wireless channel of the cell is being occupied at this time, so stop transmitting. This kind of interference will significantly reduce the network capacity when the network is not optimized or the number of available channels is very small. As shown in the figure below, the four Wi-Fi AP are networked with three channels. However, since there are only three channels available, AP1 and AP2 have to be deployed on the same channel Channel 6, when the signal of AP2 is interference to the user equipment belonging to AP1-Overlapped Basic Service Set (OBSS, overlapping basic service units, which can be understood as overlapping cells with the same frequency).
With the increasing degree of automation of cars and electric vehicles, the number of semiconductors required will increase sharply. Most semiconductors are traditional analog and power semiconductors. These traditional analog and power semiconductors are produced by 8-inch factories. Because it is difficult to ensure 8-inch manufacturing equipment, it is difficult to add new 8-inch semiconductor factories. In short, self-driving cars certainly need state-of-the-art semiconductors to run advanced artificial intelligence (AI), but the need for a large number of traditional analog and power semiconductors has become the Achilles’ heel of automobile production, and it is not easy to solve this problem. Although the automobile industry has ushered in an once-in-a-century period of great change in CASE (Connected, Autonomous/Automated, Shared, Electric), it is also an era suffering from the shortage of 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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