RF Overview

RF is radio frequency current, which is the abbreviation of high-frequency alternating electromagnetic waves. RF technology plays a wide and irreplaceable role in the field of wireless communication. The application of RF technology in the field of communication is still in the development stage and is not widely used. However, as RF communication technology matures, the future market demand is huge and the prospects are broad.
Bluetooth wireless technology adopts a digital coding technology that extends the narrowband signal spectrum. Through coding operations, the number of transmitted bits is increased and the bandwidth is expanded. Bluetooth uses frequency hopping to expand the spectrum. Frequency hopping spread spectrum reduces the signal power spectrum density on the bandwidth, thereby greatly improving the system's ability to resist electromagnetic interference and crosstalk interference, making Bluetooth wireless data transmission more reliable. In terms of frequency band and channel allocation, the Bluetooth system generally operates in the 2.4GHz ISM band. The starting frequency is 2.402GHz, the ending frequency is 2.480GHz, and a 2MHz protection band is set at the low end and a 3.5MHz protection band is set at the high end.
The first-generation WLAN radio frequency technology solution has very limited ability to respond to changes in user density and cannot effectively optimize bandwidth resources. Next-generation systems will make full use of the entire software framework to detect access point failures and automatically adjust based on the working conditions of nearby access points. By controlling the output transmission power and operating frequency of each access point, the system can allow specific access points to fill possible coverage gaps by increasing power or changing channels, or to mitigate interference between access points, thereby increasing network stability.
Ultra-wideband (UWB) is a wireless radio frequency technology that supports home appliances, computer peripherals and mobile devices to transmit data at high speeds over short distances with very low power consumption. This technology is ideal for wireless transmission of high-quality multimedia content. UWB technology uses broadband wireless spectrum to transmit data over short distances, which can transmit more data wirelessly in a specific period of time than traditional wireless technologies. This feature, combined with low-power pulse data delivery capabilities, speeds up data transmission without interference from other existing wireless technologies. One advantage of ultra-wideband technology is that the circuit is simpler, especially on the receiving end, because there is no need to generate carriers locally, nor is it necessary to provide multiple stages of hybrid circuits, shaping filters, etc.
One of the most promising ultra-wideband technologies is impulse radio (IR). IR signals consist of extremely narrow pulse trains that appear pseudo-randomly in time. Pseudo-randomness is achieved by time-hopping codes, which randomize the transmitted signal to facilitate user separation and spectrum shaping to avoid eavesdropping. Signal modulation can be pulse amplitude modulation or pulse position modulation. To ensure low-cost ultra-wideband devices, all pulses have the same waveform.
RF plays a completely different role in the entire wireless network medium. Although the physical layer is not responsible for device and user authentication, nor is it responsible for encrypting data packets transmitted over the air, it can provide important data for unauthorized access points or suspicious client device behavior. RF management is to ensure that RF energy is transmitted without causing any pollution - let the energy go where it is needed and away from where it is not needed.