What is the baseband? What does the baseband look like?
Since we entered the 4G era, various mobile phone manufacturers' new product launch conferences will hear a series of proper terms related to communication networks, such as full Netcom, x-mode x-frequency, etc. These technologies are mainly from one of the mobile phones. A chip support called baseband. So what is a baseband chip?
What is the baseband?
For the word baseband, many netizens are familiar with things. After all, in the "old" era, Android can freely write baseband, just as it is as simple as updating ROM. After brushing into the new baseband, it may also signal the phone. The call quality has been enhanced. However, here, the baseband we refer to is the baseband chip on the hardware.
The baseband chip is the communication module in the mobile phone. The most important function is to communicate with the base station of the mobile communication network to modulate, demodulate, encode and decode the uplink and downlink wireless signals. Without its support, your mobile phone can only be a display device, unable to play the communication function that the mobile phone should have, including a series of interconnection functions such as call, text message and Internet access. The role of the baseband is very similar to the role of the light cat and ADSL cat in our daily life, but the signal processing object is changed from light and electricity to electromagnetic waves.
The core part of the baseband chip is divided into two parts: the RF part and the baseband part. The radio frequency part is to modulate an electrical signal into an electromagnetic wave to transmit or demodulate the received electromagnetic wave, and to implement up-conversion and down-conversion of the baseband modulated signal. The baseband portion is generally for signal processing. Generally, the fixed function DSP provides powerful processing capability. In modern communication devices, the DSP is generally used as voice signal processing, channel codec, image processing, and the like.
Therefore, what kind of standard network and frequency band your mobile phone supports, the quality of the call, the speed of the network speed, and the strength of the signal are determined by the baseband chip. The difference in parameters, performance and experience between different baseband chips is very large. Therefore, the quality of the baseband has basically determined the experience of your mobile phone, the appearance of the beautiful and fine mobile phone, there is no strong baseband chip behind the silent support, it is just a vase thing, can not be used . The core part of the baseband chip phone is also the most technical part, and only a few manufacturers around the world have this technology.
What does the baseband look like?
Integrated in SoC:
At present, the mobile baseband tends to be integrated on the SoC (System on a Chip, on-chip system, which is a chip that integrates a lot of functions). Take the Qualcomm Snapdragon 835 as an example. On the entire SoC chip, the CPU, GPU, DSP, ISP, security module and X16 LTE Modem are integrated, which is the mobile baseband.
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