What is a mobile phone baseband?

The term "baseband" may not be familiar to most users. What is a mobile phone baseband? Let's help you popularize it.

What is a mobile phone baseband?

The full English name of baseband is Baseband, which can also be translated as "information source" (information source, also called the transmitting terminal) without modulation (spectrum shifting). The inherent frequency band (frequency bandwidth) of the original electrical signal (and transformation) is called the basic frequency band, or baseband for short. Baseband corresponds to frequency band. Frequency band: the frequency bandwidth occupied by the baseband signal before modulation (the difference from the lowest frequency to the highest frequency occupied by a signal). Nowadays, we generally discuss mobile phone baseband. In layman’s terms, it is the broadband frequency range in which mobile phones receive network signals.

Previous tips related to Apple iPhones usually mentioned the baseband, which is used to manage the iPhone’s phone calls and network access. If the baseband error will cause the phone to be unable to receive network signals, today's Android phones are also prone to baseband problems, especially if the Android phone is not flashed properly, or the flashed ROM is not very good, it may cause network instability and cause the phone to have no signal. A more classic phenomenon is that after flashing the Motorola ME525 Princess, it is easy for the phone to have no signal after moving across provinces. This is the tonal NE525 baseband bug.

What does the baseband version of a mobile phone mean?

The baseband version is a circuit in a mobile phone that is responsible for demodulating, descrambling, and decoding wireless signals in the mobile/China Unicom/Telecom network. Expansion and decoding work, and the final decoded digital signal is passed to the upper-layer processing system for processing. Our mobile phones usually consist of two major circuits. One part is the high-level processing part, which is equivalent to the computer we use; the other part is the baseband, which is equivalent to the Modem we use. What network standards does the mobile phone support (GSM, CDMA, WCDMA, TD-SCDMA, etc.) are all determined by it, just like the difference between ADSL Modem and ordinary narrowband Modem. When we use mobile phones to make calls, surf the Internet, send text messages, etc., all instructions (usually standard AT commands) are issued to the baseband part through the upper-layer processing system, and are processed and executed by the baseband part. After the baseband part completes the processing, it will be processed on the mobile phone and A logical channel is established between wireless networks, and our voice, text messages or Internet data packets are transmitted through this logical channel. With the development of software radio technology, the baseband part in mobile phones can now basically use software to decode wireless signals. At the same time, software radio technology can be used to easily upgrade the baseband part to meet different needs or Fixed the BUG in the baseband part.