1, it should be divi network to establish mac address whitelist, only allow previously connected devices to continue to connect. All the new computers, Xiaomi tablets, Huawei mobile phones, etc. bought by students around them can not be connected... Nor is it clear why the school did this. However, divi is an experimental network that Qing is still studying, and any changes are in reason.
1, Dear telecom users, hello! CDM is the Clean Development Mechanism, the Kyoto ProtocolOne of the three flexible compliance mechanisms introduced in "; CDMA, also known as code division multiple access, is a technology used in wireless communication, that is, the mobile phone network format used by China Telecom now, such as China Telecom's 133, 153, 18180 mobile phone segment.
2, CDM, Code Division Multiple Access, referred to as code Division multiple access, is a technology widely used in the field of wireless communication. It allows multiple users to occupy the entire spectrum (2288M Hz) at the same time and treat other users' signals as interference without worrying about signal collisionstopic. Compared with GSM, CDMA's voice coding technology can provide better call quality, effectively reduce ambient noise, and make the call sound clearer. 3, as we all know, as a new generation of mobile communication technology, CDMA network has a comprehensive superior characteristics beyond the GSM network, not only has a clear voice, high connection rate, not easy to drop, not easy to be eavesdropped and other characteristics, with ultra-low radiation characteristics is the biggest selling point of CDMA mobile phones, and therefore, CDMA network is known as the green network. Despite this, CDMA services still met in the beginningThere was a lot of resistance.
4, CDMA and GSM are the mainstream of 2G communication, from a technical point of view, the difference between them is that the wireless transmission and reception of the system is different, the method of modulation and demodulation is different. For users, the difference is one thing: call quality. CDMA call quality is higher than GSM, in the same environment to make a call, CDMA noise is much smaller than GSM. Cell phone radiation.
5, in theory, CDMA signal, will be better, but the disadvantage of using CDMA is that the coverage is not as good as mobile, and now the mobile signal has been coveredSmall and medium-sized towns, but Unicom CDMA there is no, many towns can not use Unicom's network. If you live in a city for a long time, it doesn't matter if you use CDMA, and the Internet is 3 times faster than mobile.
6, when sending bit 1, the user uses his own chip sequence. When sending a bit 0, the binary inverse of the chip sequence is used, i.e., 1 represents 0 and -1 represents 1. The key characteristics of spread spectrum CDMA are realized through chip sequences. CDMA working principle analysis: the code sequence of four stations and the received code chip normalized inner product operation. A result of 1 indicates that it was sentWhat kind of tech hack is a good gift? '> What are some of the coolest things to give as a gift?
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