The value of 25m for cell phone jammer is got under the condition ...

The general term for IMT-2000, opened the era of 3G, 3G become a synonym of the IMT-2000. In 2007, the ITU has approved the WiMAX, bringing the total of five IMT-2000 3G specification [2]. Reasons for the coexistence of multiple specifications, the fundamental reason lies in what kind of radio frequency technology to transmit information, and a variety of techniques can be done with a task, both merits and demerits of each technology, no technology to the overwhelming the winner, so there?s game situation. Mobile network to solve the core problem is to simultaneously support two-way communication for multiple mobile phone users, there are two key words here, a multiple handsets at the same time communication, namely the Multiple Access (MA), Chinese translated as ?multiple access?. This new type of GPS? cell phone jammer has a very attractive and eye-catching characteristic.
Communicating parties is a two-way communications, instead of broadcasting, as I said, you listen, that is, the Double Duplex, Chinese translated as ?two-way duplex. There are three typical multiple access mobile communication, frequency division multiple access (FDMA), time division multiple access (TDMA) and Code Division Multiple Access (CDMA). FDMA is the basic idea is to split the available spectrum into several bands, each speaker exclusive to one band. Of course, this is a rough image of the statement, the content of the communication of voice, but also the packet, such as SMS MMS and Internet access. If the signal strength is too strong, the shielding radius of cell phone jammer will be decreased correspondingly.
In addition, the main body of the communication is not people, but mobile phones or base stations. TDMA basic idea is the same band, divided into several periods, we take turns to speak, but each time only allows one person to speak. FDMA and TDMA can be mixed with, for example, first the entire available spectrum into several bands, which is the practice of FD, the implementation of time-sharing system in each frequency band, which is the practice of TD. CDMA and TDMA shared a band, but different from the time-sharing system for TDMA, CDMA encoding (the Code) to distinguish between different people speak, the equivalent of everyone to speak, to produce their own brand name, but speaking time of varying lengths. The GPS? cell phone jammer can be prevent from being found when the customer doesn?t want others knows the use and existence of the GPS cell phone jammer.
CDMA technology than both complex because there are two, one needs to speak with a band of rushes record, according to a spokesman for cutting, and then the same person to speak fragments spliced together, (2) squeeze too many people talking in the same band, will interfere with each other, so the need to spread spectrum, the speaker also is distributed to the different frequency bands. And FD, each band would not let a person or a few exclusive, but they must attack, dynamic allocation of the number of people to speak equally in each band. This technique is called spread spectrum (Spread Spectrum, SS), spread spectrum there are a variety of implementations, such as the DS spread spectrum (DSSS) and Frequency Hopping Spread Spectrum (FHSS). Two-way duplex multiple access, also in the band and time to think of a way. The charger of? cell phone jammer is the plug and charge type.
Usually referred to as the communication channel from the phone to the base station uplink (Uplink), the base station to the mobile communication channel called the downlink (Downlink). For voice communications, the uplink and downlink traffic was essentially flat. However, for data communications, the downlink traffic is much larger than the upstream traffic, this is because the paste the visitors to see far more than posting a people. For 3G, had a heavy load of data communications, so make sure the downlink bandwidth than uplink bandwidth. Frequency division duplex (FDD) to the entire available spectrum into several bands. For data communications, FDD majority band is assigned to the downlink, a small number of left upstream. For the business of voice calls, the FDD to each phone is assigned the two bands, one for uplink and one for downlink. Time division duplex (TDD) implementation of time-sharing system, according to the uplink and downlink traffic, according to need periods. More and more customers are being interested in the GPS? cell phone jammer .

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Source: http://www.jammer-cell-phone.com/the-value-of-25m-for-cell-phone-jammer-is-got-under-the-condition/

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