What is baseband?
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For the term baseband, many users must be familiar with things, after all, in the \"ancient\" era of Android is free to brush the baseband, as simple as updating ROM, after brushing into the new baseband may also have a certain enhancement of the signal and call quality of the mobile phone. However, in this case, we refer to baseband is the baseband chip on the hardware.
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The baseband chip is the communication module in the mobile phone, and its main function is to communicate with the base station of the mobile communication network, and to modulate, demodulate, encode and decode the wireless signal up and down the line. Without its support, your mobile phone can only be a decoration, and it can not play the communication role that the mobile phone should have, including calls, SMS, and a series of interconnection functions. The role of baseband is very similar to the role of light cat and ADSL cat in our daily life, but the signal processing object is changed from light and electricity to electromagnetic waves.
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The core part of the baseband chip is mainly divided into two parts: the RF part and the baseband part. The radio frequency part is to modulate the electrical signal into an electromagnetic wave to send out or demodulate the received electromagnetic wave, and realize the up-conversion and down-conversion of the baseband modulated signal. The baseband part is generally for signal processing, generally by the fixed function of the DSP to provide powerful processing capabilities, in modern communication equipment, DSP is generally used as voice signal processing, channel encoding and decoding, image processing and so on.