What does baseband mean?

Baseband is a circuit in the mobile phone, which is responsible for demodulating, descrambling, despreading and decoding the wireless signals in the mobile network, and transmitting the finally decoded digital signals to the upper processing system for processing. Baseband is commonly known as BB, which can be understood as communication module.

Baseband is a general term used to name some components inside the iPhone. Baseband is used to manage phone and network access of iPhone. Baseband is a very small and special independent computer system, which runs inside the iPhone. It runs separately from the main system that controls iPhone software (e-mail, Google Maps) and communicates with the main system of iPhone through the internal network.

Mobile phones usually consist of two circuits, one is the advanced processing part, which is equivalent to the computer we use; The other part is baseband, which is equivalent to the modem we use. What kind of network standard does the mobile phone support (GSM, CDMA, WCDMA, TD-SCDMA, etc.)? ) is determined by it, just like the difference between ADSL modem and ordinary narrowband modem.

When a mobile phone makes a call, accesses the Internet, sends a message, etc. It sends instructions (usually standard AT instructions) to the baseband part through the upper processing system, which is processed and executed by the baseband part. After the baseband part is processed, it will establish a logical channel between the mobile phone and the wireless network, and transmit our voice, messages or Internet data packets through this channel.