3/9/2014 3g : Understanding WCDMA

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3G

Understanding WCDMA

3G technology also comes in various forms and platforms. Understanding the major ones willhelp you decide which one is the right tool. You should also tell the technical details, to know ifyou are getting the right kind of efficiency and accessibility. Getting information from the internetother various sources will never be as convenient as fast, since 3G is the newest available.There are new developments and changes as well to get you ahead.

Knowing WCDMA or UMTS

W-CDMA wideband code-division multiple-access is among the major technologies thatimplement the 3G or third generation cellular systems. This is founded on the radio accesstechnique suggested by the ETSI Alpha Group. The details and specifications were finalized in1999. The implementation of W-CDMA is going to be a technical challenge due to the complexityand versatility. The sophistication of the of the systems of W-CDMA can be seen from variousaspects.

These are namely the complexity of the overall system, computation complexity of the receiverand the complexity of ever single algorithm. W-CDMA link-level simulations or more than 10times the compute intensive compared to 2G simulations. In the interface of W-CDMA, thedifferent interface users can immediately transmit at varying information rates, with the datarates even varying in time. Networks of the UMTS are required to support every 2G service, plusnew services and applications.

The Technical Details

As for the FDD technical summary, the frequency band will range from 1920 MHz up to 1980 MHzand 2110 MHz and 2170 MHz or frequency division duplex. The minimum frequency bandneeded is 2 x 5 MHz. The frequency re-use is 1. Carrier spacing is between 4.4 MHz and 5.2MHz. The most number of voice channels on 2 x 5 MHz is 96 with a spreading factor of 256 ULand AMR or 7.95 Kbps and 98 with a spreading factor of 128 UL and AMR of 12.2 Kbps.

Other Specs

The voice coding includes AMR codecs ranging from 4.75 kHz up to 12.2 kHz, GSM EFR is at12.2 kHz. SID is also included at 1.8 kHz. The channel coding includes convolutional coding withturbo code for high rate data. The duplexer required is 190 MHz separation with asymmetricconnection supported. Tx and Rx isolation is MS:55db and BS:80dB. The Receiver is Rake,while receiver sensitivity is Node B.

More Information

Data type for the device is packet and circuit switch. Modulation is QPSK and pulse shaping isroot raised cosine, rolling off at 0.22. The chip rate is 3.84 Mcps while the channel raster is 200kHz. Maximum user data rate on the physical channel is 2.3 Mbps with a spreading factor of 4,and parallel codes of 3 DL / 6 UL, with limited interference. HSPDA will provide data speeds

going as fast as 8 to 10 Mps and 20 Mbps for MIMO systems. The channel it rate is 5.67 Mbpswith a frame length of 10 ms or 38400 chips.

There are 15 slots or frames, and 2560 chips. Handovers are soft and softer, plus a hardinterfrequency. The power control period has a time slot with a rate of 1500 Hz. Power controlstep size is 0.5, 1, 1.5 and 2 dB while power control range is UL 80 dB and DL at 30 dB.

3g demonstrations

3g history and background

3g uses and features

about the cdma2000

advantages of 3g

an introduction to 3g

technology

choosing a 3g unit

compatibility discussions with

3g

development from 2g to 3g

getting to know 3g

development

getting to know the iphone 3g

knowing the different 3g types

plus and minuses of 3g

technology

smartphone and 3g stories

some consequences of 3g

starting the smartphone and

3g

the 3g networks 101

the divisions of 3g

the evolution of 3g

the iphone 3g review

the platforms of 3g

the several uses of 3g

umts and 3g

understanding wcdma

where 3g is now

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step size is 0.5, 1, 1.5 and 2 dB while power control range is UL 80 dB and DL at 30 dB.

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