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Software adds AWGN simulation to mobile carrier-noise test

Posted: 30 Aug 2005 ?? ?Print Version ?Bookmark and Share

Keywords:aeroflex? awgn? additive white gaussian noise? iqcreator? software?

Letting you test mobile handsets for real-world noise conditions, test equipment maker Aeroflex is now including an AWGN (additive white Gaussian noise) source to its existing IQCreator software. The addition of the AWGN feature transforms two of the company's RF signal generator into noise generators.

IQCreator is a free Windows-hosted application that lets you set up a wireless carrier modulation scheme and then create an arbitrary waveform file for use with Aeroflex's IFR 3410 and 3020 PXI Series signal generators.

Many modulation types

IQCreator supports a wide variety of modulation types. It's also constantly updated by Aeroflex. In use, IQCreator with AWGN lets you accurately add AWGN to any modulated signalwithout complex calibration.

IQCreator's AWGN feature can generate standalone AWGN power and repeatable SNRs (signal-to-noise ratios: carrier noise or C/N). A precise and repeatable in-channel AWGN is important when determining a mobile receiver's sensitivity threshold.

The AWGN feature can also add noise in defined bandwidths, as a single interferer on one carrier signal, or within multi-carrier applications. Noise can also be added in-channel or in adjacent channelson a single signal or among signals in a multi-carrier application.

The underlying bits

For its part, Aeroflex's existing IQCreator software lets you set up a modulation scheme and then create an arbitrary waveform generator file. Graphical displays of a waveform's spectrum, vector and constellation diagrams can be viewed and exported for use in other Windows applications.

The arbitrary waveform generator file can also be saved or downloaded into the instrument itself. User-defined configurations can also be saved. Consequently, it's possible to load previously saved setups to regenerate arbitrary waveform generator files.

Other capabilities of IQCreator include generic modulation, TDMA digital standards, modulation impairments, WLAN (including IEEE-802.11a/b/g), CDMA digital standards and extensive graphical capabilities.

- Alex Mendelsohn


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