When we use the mobile phone to access the Internet, the mobile phone will be connected to the Internet through the signal tower. This process involves some key technologies, such as Frequency Division Multiplexing (FDM), Time Division Multiplexing (TDM), and Digital Signal Processing (DSP).
Firstly, the mobile phone will establish a connection with the nearest signal tower through radio signals. Then, the signal tower will transmit the data sent by the mobile phone to the farther base station or network equipment, which will then transmit the data to the Internet through the transmission line. On the contrary, when the phone receives data from the Internet, the data will be transmitted to the phone through the opposite path.
During data transmission, frequency division multiplexing technology can allocate different signals to different frequencies to avoid mutual interference; Time division multiplexing technology can divide data into different time slots and transmit them one by one to avoid collisions and data loss; Digital signal processing technology can convert analog signals into digital signals and perform compression, decompression, and other processing to facilitate transmission and storage.
