What is CDMA and how it differs from WCDMA?

hei wha is CDMA and what is the difference between wcdma

how stuffworks cdma

http://en.wikipedia.org/wiki/W-CDMA

**broken link removed**


google.com

cdma dcs korea encode

Hello,



CDMA is the USA cellular system and WCDMA is the European UMTS or the 3G standard.

spread codes


CDMA


It is CODE DIVISION MULTIPLE ACCESS technique where for each subscriber in a cellular network he got his own encryption code .It has better sound quality but has the disadvantage of not changing the service provider (wrt GSM technique )
It sends synchronisation frame to make the receiver synchronized to it . But has no reception technique of TV signals and Video .




WCDMA

It is WIDEBAND CODE DIVISION MULTIPLE ACCESS technique (where for each subscriber in a cellular network he got his own encryption code ) and It is faster than the Old CDMA technique and is a 3rd generation mobile technique nowadys mostly used in JAPAN . It supports Video transfer , MMS and TV signal reception .
It is almost 4 times wider in bandwidth than 2G network techniques .

Re: what is CDMA

# (Code Division Multiple Access): A technology for digital transmission of radio signals between, for example, a mobile telephone and a radio base station. In CDMA, a frequency is divided into a number of codes.
www.ceva-dsp.com/news/glossary.php

# A spread spectrum approach to digital transmission. With CDMA, each conversation is digitized and then tagged with a code. Also known as IS-95A or cdmaOne.
bestcellularrates.indranet.com/bestcellularrates1.html

# Code Division Multiple Access. Refers to a multiple-access scheme where stations use spread-spectrum modulations and orthogonal codes to avoid interfering with one another.
www.spidersat.net/glossary/glossary_c.htm

# A method of frequency reuse whereby many radios use the same frequency but each one has a unique code. GPS uses CDMA techniques with Gold's codes for their unique cross-correlation properties.
www.eurofix.tudelft.nl/glossary.htm

# Code Division Multiple Access: a digital wireless telephony transmission technique. 1. CDMA allows multiple frequencies to be used simultaneously (Spread Spectrum). The CDMA idea was originally developed for military use over 30 years ago. 2. The CDMA standards used for second-generation mobile telephony are the IS-95 standards championed by QUALCOMM.
www.polyphonic-ringtones-ring-tones.co.uk/glossary.html

# Stands for Code Division Multiple Access, a mobile technology, operated in several countries including the USA and South Korea.
www.cellhire.com/content/glossary.htm

# Code Division Multiple Access: A spread spectrum air interface technology used in some digital cellular, personal communications services and other wireless networks.
www.braddye.com/glossary.html

# (code division multiple access;
www.business2.com/b2/web/articles/0,17863,527365,00.html

# Code Division Multiple Access. CDMA technology was originally developed for military use in the late 1960's, and is a multiple access technique, using sequenced code to divide traffic channels within the same radio channels.
free-cell-phone-shop.com/freecellphonesguy-wireless-glossary.cfm

# Code-Division Multiple Access. Further info in Technical Archive.
www.dynamic-webs.co.uk/information/glossary.html

# Code Division Multiple Access got its start as a military technology, developed by the Allies in WWII. Much like data sent over the Internet, CDMA conversations are "spread" when sent, then reassembled upon arrival. The technology allows multiple calls to be carried over one channel. CDMA is the fastest-growing transmission technology and is basically the multiplexing platform for 3G. ...
www.10meters.com/communications_glossary.html

# Code Division Multiple Access, the second type of digital cellular system to be deployed in the United States (See TDMA).
www.nhtsa.dot.gov/people/injury/research/wireless/append.htm

# Technique that spreads a signal over a frequency band that is larger than the signal to gain interface immunity; users transmit different spreading codes over a communications channel.
www.sprint.com/sprint/ir/it/ig.html

# Code Division Multiple Access. An access technique in which every earth station may transmit at the same frequency and at the same time, but only at a given, limited power level. This technique requires that each earth station use a unique identifying code, which is modulated with the communications signal. CDMA is the access technique used with spread-spectrum data distribution and some VSAT and mobile satellite systems.
www.telesat.ca/satellites/terminology.htm

# Code Division Multiple Access - a technique by which each conversation is sent over multiple frequencies with each conversation having a unique code. Forms the basis of W-CDMA which is the European proposed standard for 3G. ...
www.orange.com/English/glossary/glossaryc.asp

# Code Division Multiple Access. A spread spectrum air interface protocol that uses radio frequencies to provide mobile telecom services, including interoperability with the wireline PSTN (public switched telephone network). A so-called "second generation" (2G) service, CDMA was developed in the US by Qualcomm and, with TDMA and GSM TDMA, is one of three main protocol implementations used in delivering PCS mobile voice services. French: AMRC.
www.crtc.gc.ca/dcs/eng/glossary.htm

# Code Division Multiple Access - a technology for cellular networks.
www.intoweb.co.za/it-terms.php

# Code Division Multiple Access. Also known as spread spectrum, allowing several users to share a channel by allocating "codes" that allow each one to distinguish between them, even though they use the same frequency bands at the same time.
www.flw.com/define_c.htm

# This technology converts analogue signals into digital which are then transmitted over a network. CDMA enables multiple phone calls to be carried on the same frequency by using a voice-coding system. For more information see How cell phones work – cellular access technologies (How Stuff Works, USA).
www.science.org.au/nova/022/022glo.htm

# A method of digital wireless transmission that allows a large number of users to share access to a single radio channel by assigning unique code sequences to each user.
www.interdigital.com/glossary.jsp

# Code division multiple access is a modulation scheme whereby a fixed bandwidth is used by multiple users. Each users’ carrier is modulated with a unique pseudo random code, usually be means of either direct sequence or frequency hopping spread spectrum modulation. The signal of one user hence looks like noise to another user. Individual signals are extracted at the receiver by a correlation process (both the transmitter and receiver use the same pseudo random sequence).
www.poynting.co.za/tech_training/glossary.shtml

# Code Division Multiple Access. A digital spread-spectrum wireless transmission technology that transmits data from calls across the entire frequency band with codes for proper signal recovery at the other end (see PCS).
www.mnta.org/publications/publications_industry_glossary.html

# Code Division Multiple Access. A standard using spread spectrum transmission, the same frequencies being used by other CDMA or narrowband systems. The term CDMA is often used to refer to IS-95 or cdmaOne.
www.keep-talking.net/glossary.htm

# Code Division Multiple Access, a method of encoding and carrying digital cellphone messages which is commonly used in America and elsewhere. It rivals GSM in other countries (particularly Europe) as the standard for digital cellular. In New Zealand, Telecom's mobile service is based on CDMA, while Vodafone runs on GSM. Variants of CDMA that will be used in high-speed cellphone data services include W-CDMA and cdma2000.
www.techwriter.co.nz/nerd-ad.html

# CDMA is a digital communication technology to provide PCS service used by some carriers in which an air interface assigns a code to each data packet sent over the air. The name CDMA is often used to refer to the IS-95 communications standard. Other technologies used are TDMA and GSM.
www.ideacellular.com/Glossary02.htm

# Generically (as a multiplexing scheme), code division multiple access (CDMA) is any use of any form of spread spectrum by multiple transmitters to send to the same receiver on the same frequency channel at the same time without harmful interference. Other widely used multiple access techniques are Time Division Multiple Access (TDMA) and Frequency Division Multiple Access (FDMA). ...

apart from wikipedia consult the following

**broken link removed**

http://www.tech-faq.com/cdma-2000-1xrtt.shtml

http://www.wisegeek.com/what-is-the-difference-between-gsm-and-cdma.htm
(will tell u the dif b/w gsm and cdma)

Re: what is CDMA

plz refer
www.sss-mag.com/w-cdma1.h
www.mobiledia.com/glossary/271.html
searchmobilecomputing.techtarget.com/sDefinition/0,,sid40_gci505610,00.html

Re: what is CDMA

Code division multiple access (CDMA) is a form of multiplexing and a method of multiple access that divides up a radio channel not by time (as in time division multiple access), nor by frequency (as in frequency-division multiple access), but instead by using different pseudo-random code sequences for each user. CDMA is a form of "spread-spectrum" signaling, since the modulated coded signal has a much higher bandwidth than the data being communicated.

what is CDMA

thank you good

Re: what is CDMA

similat post here :
#843190

what is CDMA

CDMA stands for code division multiplexing access. it uses a +1 for 1bit and -1 for 0 bit.