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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.
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.
Key Technologies of SoC Design: SoC key technologies mainly include bus architecture technology, IP core reuse technology, software and hardware co-design technology, SoC verification technology, testability design technology, low-power design technology, ultra-deep sub-micron circuit implementation technology, and embedded software porting. A circuit system capable of realizing certain functions is composed of multiple modules, such as processors, interfaces, memories, analog-to-digital converters, and so on. These functional modules can be implemented by discrete devices, and then combined on a printed circuit board (PCB) to finally form a system-on-a-Board. A schematic diagram of the on-board system is shown below.
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