Wi-FM: FM radio signals can greatly improve the wireless network speed.

Wi-FM: FM radio signals can greatly improve the wireless network speed.

With the popularization of smart devices, people require a higher transmission rate of Wi-Fi wireless technology. Sometimes, multiple wireless connections may interfere with each other, resulting in a sudden decrease in the network speed. Researchers from the College of Engineering at the Northwestern University of America got along with a clever method to improve the data throughput of wireless signals by using FMFM radio signals and smart time-sharing systems, it also prevents sudden decrease in network speed.

Researchers turn this technology into Wi-FM, which can avoid conflicts when devices in the same group receive packets while transmitting network data. Conflicting with each other will lead to the occurrence of Back-Off. Back-Off refers to the forced retransmission delay when the network node sends data in conflict, which will seriously affect the network speed. The Wi-Fi-FM technology uses a network protocol that allows devices to automatically monitor data transmission at network nodes and transmit network data through FM radio frequency modulation signals at idle time. "It can monitor network conditions, and choose to transmit data with FM during idle hours to bypass other people's network lines to avoid Back-Off," said Marcel Flores, a doctoral researcher ."

The team transmits wireless network signals through commercial FM radio frequency modulation signals. The frequency ranges from 87.5Mhz ~ Between Two MHz. These signals can be received and synchronized to digital signals by Radio Data System devices) the sub-carrier is used to send the radio station name, program type, program content and other information in digital form in the FM broadcast transmitting signal. Currently, FM chips of many mobile devices, including smartphones, can receive RDS signals. The FM radio frequency modulation signal is more penetrating than Wi-Fi, and it is very reliable when sending and receiving signals. Currently, the operating FM system is compatible with this technology. The team said that devices could receive Wi-Fi signals only after small software upgrades.