Electronic supplies information database information aggregation platform today? Orthogonal frequency division multiple access OFDMA: Friends who are familiar with Wi-Fi should know that the empty port of Wi-Fi adopts orthogonal frequency division multiplexing (OFDM) modulation, that is, the whole bandwidth is composed of orthogonal subcarriers. In Wi-Fi 6, the 802.11 working group introduced OFDMA access from LTE. The addition of such an “A” word can be said to have brought a qualitative change to the network capacity. As shown in the figure on the left below, Wi-Fi 5-based OFDM can only allocate all the bandwidth in the channel to one user at any one time, even if that user’s data needs do not need to take up all the bandwidth. When other users connect to the network, they need to wait for the next sending opportunity window (TXOP). This is very inefficient in the use of channel resources, especially when there is a significant increase in equipment. See even more info on ab2040b-lw100-r.
From the perspective of automakers, semiconductors will not be enough until 2024,” read next to the big news in the April 30 edition of the Nikkei News. In this article, Intel CEO Pat Gelsinger said at its financial results conference on April 28 that “due to capacity and production equipment constraints, semiconductor shortages will last until at least 2024. How long will this shortage of semiconductors last? I began to think that, as Intel’s chief executive said, “at least until 2024”, the semiconductor shortage will not disappear, and the semiconductor shortage will last for a long time. In this article, I would like to discuss the basic principles. If we come to a conclusion first, we speculate that there will be a long-term shortage of traditional analog and power semiconductors in the future due to the following reasons.
The integration density of the current CPU is very high. The above functions are now integrated into the CPU and become a chip. For example, the K60 chip I am using now has these peripheral functions. The four chips of the early CPU peripherals are now integrated into one chip, so the current System is in one chip. That is, System on Chip (SoC), so theoretically there is a difference between CPU and SoC. The standard CPU refers to the early chips that only contain arithmetic units and controllers, and SoC has integrated the system into a whole chip. Therefore, the chips you buy now are all SoCs, and the standard CPUs are not too big to buy. Today’s CPUs have integrated many peripherals inside.
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