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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.
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.
In the onboard system shown in the figure above, the green rectangle represents the printed circuit board (PCB), and the small rectangles of various colors above represent various functional modules in the system, such as memory. The functions of these modules are implemented by independent silicon chips, and they are connected by metal traces on the PCB to finally form a complete system. The System-on-Chip refers to the realization of the functions of the entire system on a single silicon chip. The schematic diagram is as follows: As shown in the figure above, a system-on-a-chip (SoC) implements various functional modules such as storage, processing, logic, and interfaces in one chip, rather than requiring several different physical chips to be implemented like a system-on-board. Compared with system-on-board, SoC solutions are lower cost, enable faster and more secure data transfer between different system units, have higher overall system speed, lower power consumption, smaller physical size, and better reliability.
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