Excellent electronic supplies information database? 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. Find extra info at abls2-8.000mhz-d4y-t.
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.
CPU (Central Processing Unit): It is the computing core and controls the core of a computer. The CPU consists of an arithmetic unit, controller and register, and the bus that realizes the data, control, and status of the connection between them. Almost all CPUs work in four stages: fetch, decode, execute, and write back. The CPU fetches instructions from memory or cache, puts them into instruction registers, decodes the instructions, and executes the instructions. The so-called programmability of a computer mainly refers to the programming of the CPU.
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