W-CDMA

This article is about the multiple access technique. For the 3GPP air interface, see W-CDMA (UMTS).

It has been suggested that this article or section be merged with W-CDMA (UMTS). (Discuss)

Please help improve this article or section by expanding it. Further information might be found on the talk page. (January 2009)

Multiplex techniques

Circuit mode (constant bandwidth)
TDM · FDM · WDM Polarization multiplexing Spatial multiplexing (MIMO)
Statistical multiplexing (variable bandwidth)
Packet mode · Dynamic TDM FHSS · DSSS · OFDMA
Related topics
Channel access methods Media Access Control (MAC)
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W-CDMA (Wideband Code Division Multiple Access) is a wideband spread-spectrum channel access method that utilizes the direct-sequence spread spectrum method of asynchronous code division multiple access to achieve higher speeds and support more users compared to most time division multiple access (TDMA) schemes used today.

The term "W-CDMA" is also used to refer to the standard data interface used by the UMTS mobile communication system, W-CDMA (UMTS).

FDMA	OFDMA • WDMA • SC-FDMA

TDMA	MF-TDMA • STDMA

CDMA	W-CDMA • TD-CDMA • TD-SCDMA • DS-CDMA • FH-CDMA • OFHMA • MC-CDMA

SDMA	HC-SDMA

PDMA	•

PAMA	•

Collision recovery	ALOHA • Slotted ALOHA • R-ALOHA

Collision avoidance	MACA • MACAW • CSMA • CSMA/CD • CSMA/CA • DCF • PCF • HCF • CSMA/CARP

Collision free	Token ring • Token bus

Delay & disruption tolerant	DTN · Mobile Ad-Hoc Networking

v • d • e Wireless system generations

1G	NMT · AMPS · Hicap · CDPD · Mobitex · DataTAC · TACS · ETACS

2G	GSM · iDEN · D-AMPS · IS-95 · PDC · CSD · PHS · GPRS · HSCSD · WiDEN

2.75G	EDGE/EGPRS · CDMA2000 (1xRTT)

3G	UMTS (W-CDMA) · CDMA2000 (1xEV-DO/IS-856) · FOMA · TD-SCDMA · GAN/UMA · WiMAX

3.5G	UMTS (HSDPA) · UMTS (HSUPA) · CDMA2000 (EV-DO Rev.A)

3.75G	UMTS (HSPA+) · CDMA2000 (EV-DO Rev.B/3xRTT)

4G	Flash-OFDM · 3GPP LTE

Related articles	Comparison of mobile telecommunications standards · List of mobile telecommunications standards

v • d • e Spread spectrum in Digital Communications

Main articles	Spread spectrum & Code division multiple access History: Hedy Lamarr · Commercial use · More...

Spread spectrum Methods	Direct-sequence spread spectrum (DSSS) · Frequency-hopping spread spectrum (FHSS) · Chirp spread spectrum (CSS) · Time-hopping spread spectrum (THSS)

CDMA Schemes	W-CDMA · TD-CDMA · TD-SCDMA · DS-CDMA · FH-CDMA · MC-CDMA

Major implementations	Wi-Fi (IEEE 802.11) · Space Network (NASA) · GPS · Galileo · GLONASS · Bluetooth · Cordless phones: DECT Cellular: EV-DO Mobile · IS-95 (aka cdmaOne) · CDMA2000 (aka IS-2000) · Also: Qualcomm · Verizon

Major concepts	PN (pseudorandom noise) code · Chip · Near-far problem · Power spectral density (PSD) · Rake receiver · Low probability of intercept

See also: Digital communication · Modulation · Statistical multiplexing · Waveform