2006-10-18 23:36:47 · 6 answers · asked by amith 1 in Science & Mathematics ➔ Engineering
Code Division Multiple Access allows multiple users to use the same frequency at the same time. You just assign them a digital word (a Walsh code) that is unique to the cell phone and the base station can resolve the data, even though everyone is talking at once.
2006-10-19 03:48:23 · answer #1 · answered by Philip_Comer 3 · 0⤊ 0⤋
Code division multiple access (CDMA) is a form of multiplexing (not a modulation scheme) and a method of multiple access that does not divide up the channel by time (as in TDMA), or frequency (as in FDMA), but instead encodes data with a special code associated with each channel and uses the constructive interference properties of the special codes to perform the multiplexing. CDMA also refers to digital cellular telephony systems that make use of this multiple access scheme, such as those pioneered by Qualcomm, and W-CDMA by the International Telecommunication Union or ITU.
CDMA has since been used in many communications systems, including the Global Positioning System (GPS) and in the OmniTRACS satellite system for transportation logistics.
You could get more information from the link below...
2006-10-19 07:37:42 · answer #2 · answered by catzpaw 6 · 0⤊ 0⤋
A whole mobile telephone technology from the radio side and throughout the network. Used in USA and Japan but hardly anywhere else.
The rest of the world use GSM (which is also available in USA and Japan)
2006-10-19 07:12:06 · answer #3 · answered by amania_r 7 · 0⤊ 0⤋
stands for code division multiple access; is an alternative of GSM tech
2006-10-19 09:11:08 · answer #4 · answered by Sabure Kennedy 2 · 0⤊ 0⤋
a radio frequency used for phones that will be out in the country
2006-10-19 06:38:20 · answer #5 · answered by Ivy 2 · 0⤊ 0⤋
code division multiple access. it multiplexing technique used by US military. it is encrypted and only them can decode.
hope it helps.
2006-10-19 07:28:30 · answer #6 · answered by minnard m 2 · 0⤊ 0⤋