Recently, at the 2024 World Mobile Communications Conference, a domestic technology company released a new optical modem. This product not only supports the latest Wi Fi 7, but also connects the entire smart home network of the home, which immediately attracted widespread attention online and was called "a cat with three heads and six arms" by netizens. In recent years, smart home networks have attracted much attention. With its network system built based on new adaptive wireless frequency hopping technology, it has successfully overcome multiple technical challenges. The charm of frequency hopping technology goes far beyond that. Whether for civilian or military use, as long as it involves modern information and communication fields such as Wi Fi, Bluetooth, CDMA, radar, radio... almost all well-known modern wireless communication technologies cannot do without the word "frequency hopping". After more than 80 years of development, what significant impact has frequency hopping technology brought to human society? How will it ignite the wave of interconnected things? From piano to radio - a somewhat magical "origin" story. Before introducing frequency hopping technology, we need to first understand wireless communication. Wireless communication is a communication method that utilizes the characteristics of electromagnetic wave signals that can propagate in free space for information exchange. Early wireless communication could only transmit on one channel at a time, which led to the phenomenon of frequency band congestion in daily use of wireless communication. For example, the remote control for one's own garage door sometimes sends a signal to the neighbor's garage door, or one's own phone projects a screen onto the neighbor's TV. On the battlefield, the transmission of information through a single channel also makes it easy for the enemy to implement electromagnetic noise interference. Due to the various inconveniences of wireless communication, spread spectrum communication and its derivative wireless frequency hopping technology have emerged. Spread spectrum communication, also known as spread spectrum communication technology. As the name suggests, it refers to the bandwidth of the signal used to transmit information being much greater than the bandwidth of the information itself. Frequency hopping technology is one of the implementation methods of spread spectrum communication, which requires synchronous frequency hopping at both ends of the signal during the transmission and reception process in order to maintain communication. This technology enables the signal to improve spectrum utilization during transmission, effectively solving the problem of frequency band congestion, and achieving the goals of anti-interference and anti eavesdropping. The inventor of frequency hopping technology was an American woman named Heidi Lamar. Heidi Lama focused on communication during his college years. During her marriage to her arms dealer husband, Heidi Lama acquired a wealth of technical knowledge in radio, spread spectrum communication, torpedoes, and other related fields, which led to the idea of researching radio controlled torpedo anti-interference issues. This laid the foundation for her later invention of frequency hopping technology. In 1940, inspired by piano synchronized automatic performance, Heidi Lamar creatively applied this principle to control the frequency of lightning signals, giving birth to the earliest radio frequency hopping technology. Heidi Lamar's technology consists of two "sister systems". A system is set up with 88 random channels, and the system uses certain rules to synchronize the variable wavelength radio between the receiving and transmitting ships and torpedoes to jump on these 88 channels. At the same time, it ensures that the transmitter on the ship and the receiver on the torpedoes can synchronize to achieve frequency hopping, just like two automatic playing machines
Edit：Luo yu Responsible editor：Wang er dong
Source：81.cn
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