[WEBINAR] Bulletproof: How Today's Business Leaders Stay on Top

Wideband Code Division Multiple Access (WCDMA)

Definition - What does Wideband Code Division Multiple Access (WCDMA) mean?

Wideband Code Division Multiple Access (WCDMA) is a third-generation (3G) standard that employs the direct-sequence code division multiple access (DS-CDMA) channel access method and the frequency-division duplexing (FDD) method to provide high-speed and high-capacity service. WCDMA is the most commonly used variant of the Universal Mobile Telecommunications System (UMTS). It was developed by Japan’s NTT DoCoMo and formed the basis of its Freedom of Multimedia Access (FOMA) 3G Network.

Techopedia explains Wideband Code Division Multiple Access (WCDMA)

The WCDMA system is part of the UMTS. It is developed by the 3G Partnership Program, which is composed of evolved core cellular networks that belong to the Global System for Mobile (GSM) communications networks worldwide.

WCDMA features two modes:

  • Frequency Division Duplex (FDD): Separates users by employing both codes as well as frequencies. One frequency is used for the uplink, while another is used for the downlink.
  • Time Division Duplex (TDD): Separates users by employing codes, frequencies and time, wherein the same frequency is used for both uplink and downlink.

Although WCDMA is designed to operate on evolved GSM core networks, it uses code division multiple access (CDMA) for its air interface. In fact, the majority of the 3G systems in operation employ CDMA, while the rest use time division multiple access (TDMA). The TDD mode of WCDMA actually employs a combination of TDMA and CDMA.

CDMA allows multiple users to share a channel at the same time, while TDMA allows users to share the same channel by chopping it into different time slots. CDMA offers the benefits of multipath diversity and soft handoffs.

As an air interface technology, WCDMA is able to artificially increase a signal's bandwidth. It does so by modulating each baseband symbol with a binary or quaternary signature with a much higher rate than that of the original data symbol.

Share this:

Connect with us

Email Newsletter

Join thousands of others with our weekly newsletter

The 4th Era of IT Infrastructure: Superconverged Systems
The 4th Era of IT Infrastructure: Superconverged Systems:
Learn the benefits and limitations of the 3 generations of IT infrastructure – siloed, converged and hyperconverged – and discover how the 4th...
Approaches and Benefits of Network Virtualization
Approaches and Benefits of Network Virtualization:
Businesses today aspire to achieve a software-defined datacenter (SDDC) to enhance business agility and reduce operational complexity. However, the...
Free E-Book: Public Cloud Guide
Free E-Book: Public Cloud Guide:
This white paper is for leaders of Operations, Engineering, or Infrastructure teams who are creating or executing an IT roadmap.
Free Tool: Virtual Health Monitor
Free Tool: Virtual Health Monitor:
Virtual Health Monitor is a free virtualization monitoring and reporting tool for VMware, Hyper-V, RHEV, and XenServer environments.
Free 30 Day Trial – Turbonomic
Free 30 Day Trial – Turbonomic:
Turbonomic delivers an autonomic platform where virtual and cloud environments self-manage in real-time to assure application performance.