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Earlier today I attended the Wireless Test World 2008 at the Le Meridien, Bangalore, a day-long seminar presented by Agilent Technologies. My particular interest was in learning about the test solutions they had in place for WiMAX and LTE standards. The former is fairly mature in both its flavours – Fixed and Mobile. The latter is not only new but also incomplete.

Lots of items in LTE standardization are still for further study (FFS). As can be expected, Agilent’s solution for LTE is an initial offering to test early PHY layer implementations. A full-fledged solution that incorporates a validated Conformance Test suite for full stack testing is still sometime away. Core standards are getting ready right now. We can expect the first test specifications later this year. Something concrete can be expected on this front from Agilent at about the same time since they are involved closely in the standardization process. Building upon their existing partnership with Anite for the conformance of GSM/UMTS implementations, LTE conformance solution from Agilent will take a similar route.

The interest on the day was greater for WiMAX, arguably because more companies in India are working on it than on LTE. The immediate future may be more promising for WiMAX, but LTE stands an equal chance from 2011 and beyond.

The seminar was primarily presentations about established and emerging technologies, and the test capabilities Agilent offers for these. There was sufficient time in between to look at Agilent’s test solutions and see live demonstrations of their equipment. The keynote address by Mr Bhaktha Keshavachar was about the challenges faced in integrating wireless connectivity into mobile devices. In particular, the future is about bringing different radio standards into the laptop. WiFi and Bluetooth are already standard on almost all laptops. We expect the same with GPS, 3G, WiMAX and LTE in the coming years. Well, some of these models are already out in the market. We are not talking about external plugin modules but about MiniCards fully integrated into the laptop. Apparently, MiniCard are standardized and they have an extremely small form factor. Key challenges are the co-existence of multiple radio standards on the same device (interference), platform noise, high peak currents, overheating, inter-working, system performance, battery life… let’s be assured that there may challenges that we may not yet be aware of.

When it comes to WiMAX, Agilent has an impressive line-up of equipment to meet all needs of a WiMAX programme – R&D, Design Verification, Pre-Conformance, Conformance, Manufacturing, Network Deployment, Service Assurance. An OFDM signal analyzer was available as early as 2004 and a signal generator in 2005. A one-box solution was available in 2007 which today has Wave 2 and MIMO functionalities.

Agilent WiMAX Test Equipment

Agilent WiMAX Test Equipment

There are many hardware models with accompanying software packages which are sold as licensed options. These support standard WiMAX test requirements – signal generation, signal analysis, modulation analysis, constellation diagrams, power measurements, peak-to-average metrics, spectral flatness, ACLR measurement, CCDF measurement, SEM measurement. This includes support for OFDM, OFDMA and MIMO.

Small companies with limited budget would have to make choices. The availability of similar equipment under different model numbers can make it difficult to choose the right one. The best option is to talk to the sales team and get as much information as possible. It’s about knowing if a particular choice meets one’s requirement. It’s also about knowing if we are buying more than what we really need.

Based on my understanding, I have put together a subset of WiMAX test equipment from Agilent. This covers only equipment specific to WiMAX. Of course, there are lots of complementary equipment that can be used for any radio standard – power supplies, logic analyzers, oscilloscopes, battery drain analysis equipment and others.

Model Number

Name

Remarks

N5181A MXG

Vector signal generator

  • Upto 6GHz.

N5182A MXG

Vector signal generator

  • Upto 6GHz.

  • Has capability to be used with N7615B.

E4438C ESG

Vector signal generator

  • Has capability to be used with N7615B.

E8267D PSG

Vector signal generator

  • Has capability to be used with N7615B.

N7615B

Signal Studio for 802.16 WiMAX

  • Software that can be used with vector signal generators.

  • Enables application specific signal generation without having to spend time in signal creation.

N9010A EXA

Signal Analyzer

  • Option 507 enables operation upto 7 GHz. Higher options are available.

  • Better value for money than MXA series.

  • Sophisticated user interface with colour coding of channels.

  • Provides enhanced spectrum analysis.

  • Provides support for measurement applications as optional extra – N9075A is for WiMAX.

  • Generally comes with 89600 series vector signal analysis software. Examples are 89601A and 89601X.

N9020A MXA

Signal Analyzer

  • Higher specs of N9010A. For example, has WiFi testing capability which its EXA counterpart doesn’t have.
89601M

Vector signal analysis measurement application

  • Can be used with N9010A EXA.

89601X

VXA signal analyzer measurement application

  • Can be used with N9010A EXA.

N9075A

WiMAX measurement application

  • Can be used with signal analyzers N9010A and N9020A.

  • Enables WiMAX specific signal analysis.

N8300A

Wireless Networking Test Set

  • One box solution with signal generator and analyzer.

  • Only for Mobile WiMAX.

  • Generally preferred over E6651A for manufacturing.

  • Used with N6301A.

N6301A

WiMAX measurement application

  • Used for WiMAX transmitter testing.

  • Used with N8300A.

E6651A

Mobile WiMAX Test Set

  • One box solution with signal generator and analyzer.

  • Only for Mobile WiMAX.

  • For R&D, pre-conformance and conformance testing.

  • For conformance testing, used with N6430A.

  • Used for Radiated Performance Test (RPT) by ETS-Lindgren.

N6430A

WiMAX IEEE 802.16-2004/Cor2 D3 PCT

  • For Protocol Conformance Test (PCT).

  • Based on E6651A.

  • In partnership with Anite supplied software.

  • TTCN-3 runtime environment and interfaces from Testing Technologies.

N6422C

WiMAX Wireless Test Manager

  • Software with ready-to-use tests.

  • Simplifies automated testing but not as formal as TTCN-3 based testing.

  • Can be used for pre-conformance testing.

  • Can be used with E6651A.

  • Can be used with E4438C ESG or N5182A MXG with N7615A/B license.

Note: It’s easy to find information about WiMAX on Agilent’s website. Go to URL http://www.agilent.com/find/wimax

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