EMF Protection Cellphone Radiation Mobile Phone SAR Electromagnetic Prevention EMF Qlink Protect EMF Cell Phone Radiation

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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.

CDMA cell phone technology, each phone's data has a unique code
In CDMA, each phone's data has a unique code.


2G is a cell phone network protocol. Click here to learn about network protocols for Smartphones.

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. CDMA technology is the basis for Interim Standard 95 (IS-95) and operates in both the 800-MHz and 1900-MHz frequency bands.

Ideally, TDMA and CDMA are transparent to each other. In practice, high-power CDMA signals raise the noise floor for TDMA receivers, and high-power TDMA signals can cause overloading and jamming of CDMA receivers.

2G is a cell phone network protocol. Click here to learn about network protocols
for Smartphones.

Now let's look at the distinction between multiple-band and multiple-mode technologies

To read about any of the technologies click on the blue links  2G cell-phone networks for transmitting information (we'll discuss 3G technologies in the 3G section):

   Frequency division multiple access (FDMA)

   Time division multiple access (TDMA)

   Code division multiple access (CDMA)


Learn how to protect yourself from harmful radiation
emitted by your cell phone.
Click on the picture below.

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Try any Q-Link or cell chip for 3 months, absolutely  RISK-FREE If you do not feel Q-Link improves your focus, energy, or well-being, simply return it for a full refund. Airtube headsets have 30 day refund.


Research Center For Wireless Technology


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