How cdma work

CDMA uses spread spectrum technology to transmit data. This technology permits several phones to send and receive through a single channel. Each part of these separate conversations is labeled with a specific digital code. The carriers that use CDMA technology include Sprint, Verizon, Alltel, and NEXTEL.

1. How does GSM and CDMA work?
2. How do phones use CDMA make calls?
3. How CDMA is implemented?
4. How CDMA works in wireless LAN?

How does GSM and CDMA work?

GSM stands for Global System for Mobile communication, while CDMA stands for Code Division Multiple Access GSM uses FDMA (Frequency division multiple access) and TDMA (Time division multiple access). GSM supports transmitting data and voice both at once, but CDMA does have not this feature.

How do phones use CDMA make calls?

Verizon, Sprint and most other U.S. carriers use CDMA, which means no SIM card. 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.

How CDMA is implemented?

It is achieved in below steps: A signal is generated which extends over a wide bandwidth. The code which performs this action is called spreading code. Later on, a specific signal can be selected with a given code even in the presence of many other signals.

How CDMA works in wireless LAN?

To permit this without undue interference between the users, CDMA employs spread spectrum technology and a special coding scheme (where each transmitter is assigned a code). CDMA optimizes the use of available bandwidth as it transmits over the entire frequency range and does not limit the user's frequency range.