Electronic supplies information database info database 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 information on mdm-37ph003b.
From April 2020 to June 2020, the demand for cars dropped sharply due to the spread of the COVID-19 epidemic. Automakers purchase parts according to Toyota’s “Just In Time” mode of operation, so, for example, Toyota canceled orders for in-car semiconductors for Denso, its main subcontractor, which canceled orders for in-car semiconductors such as Renesas, which then cancelled subsequent orders for 28nm, which was commissioned by TSMC. Due to the special needs of COVID-19 at home under the epidemic, the production of 28nm semiconductors such as TSMC game consoles and household appliances swarmed in, and the blank production line after the cancellation of car semiconductors was instantly filled with these semiconductors.
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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