Brief Working of CDMA
CDMA takes an entirely different approach from TDMA. CDMA, after digitizing
data, spreads it out over the entire available bandwidth. Multiple calls are overlaid on
each other on the channel, with each assigned a unique sequence code. CDMA is a form
of spread spectrum, which simply means that data is sent in small pieces over a number
of the discrete frequencies available for use at any time in the specified range.
In CDMA, each phone's data has a unique code.
All of the users transmit in the same wide-band chunk of spectrum. Each user's signal is
spread over the entire bandwidth by a unique spreading code. At the receiver, that same
unique code is used to recover the signal. Because CDMA systems need to put an
accurate time-stamp on each piece of a signal, it references the GPS system for this
information. Between eight and 10 separate calls can be carried in the same channel
space as one analog AMPS call.
Raytheon
tdma and fdma
Qualcomm, Boost Mobile, MetroPCS, Leap Wireless International Inc., Net 10, Sprint, Verizon, Cricket, and Alltel use CDMA technology.
CDMA technology uses spread spectrum concept thereby giving users unique code to de-spread the information being sent to them. so CDMA is secure and occupies a large bandwidth of information compared to GSM technology.
no mts is 1600mhz cdma but nokia 2112 has only 800mhz cdma technology you can check also
A CDMA repeater is a device that extends the signal range for cell phone providers that use the CDMA technology. CDMA (Code Division Multiple Access) is one of the technologies cell phone companies use for their phone service. More information on CDMA is available here: http://en.wikipedia.org/wiki/CDMA
CDMA technology uses spread spectrum concept thereby giving users unique code to de-spread the information being sent to them. so CDMA is secure and occupies a large bandwidth of information compared to GSM technology.
Alltel phones run on CDMA technology, and there currently is no unlocking solution for CDMA phones.
Hand off
Metropcs phones run on CDMA technology and right now, there is no unlocking solution for CDMA-based phones, only for GSM phones.
Ting Wireless and Cricket wireless.
CDMA