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M9071A GSM/EDGE/EVO, X-Series Measurement Application for PXI Vector Signal Analyzers

Technical Overviews

GSM/EDGE/EVO X-Series Measurement Application for Modular Instruments

Expand the capabilities of your M9391A and M9393A PXIe vector signal analyzers (PXI VSAs) with the Keysight Technologies, Inc. library of X-Series measurement applications - the same applications used to increase the capability and functionality of its X-Series signal analyzers. Eleven of the most popular applications are now available for use with Keysight's new M9393A PXI Performance VSA and the M9391A PXI VSA. When you combine the raw hardware speeds of the PXI VSA and the X-Series measure­ment applications for modular instruments, you can test more products in less time while ensuring measurement continuity from design to manufacturing.

The M9071A GSM/EDGE/EVO X-Series measurement appli­cation for modular instruments transforms the PXI VSAs into standards-based GSM, EDGE, and EDGE-Evolution transmitter testers by adding fast RF conformance measurements to help you speed up manufacturing of your GSM/EDGE devices. The measurement application is further enhanced to support mul­ticarrier (MC) BTS and voice services over adaptive multi-user channels on one slot (VAMOS)—allowing you to stay on the leading edge of your design and manufacturing challenges.

The GSM/EDGE/EVO measurement application is just one in a common library of several measurement applications in the Keysight X-Series, an evolutionary approach to signal analysis that spans instrumentation, measurements, and software. Proven algorithms and a common user interface across the X-Series analyzers and modular PXI VSAs create a consistent measurement framework for signal analysis that ensures repeatable results and measurement integrity so you can leverage your test system software through all phases of product development. You can further extend your test assets by utilizing up to four PXI VSAs with one software license.

Keysight's X-Series applications for modular instruments also include a unique “Resource Manager” that provides direct access to PXI VSA hardware drivers for the fastest power and spectrum-based measurements, while simultaneously using the X-Series applications for fast modulation quality measure­ments and 89600 VSA for fast spectrum measurements.

GSM/EDGE Technology Overview

The global system for mobile communications (GSM) digital cellular standard is a time division multiple access (TDMA) channel access scheme that uses Gaussian minimum shift keying (GMSK) modulation. It uses 200 kHz RF channels, time division multiplexed, to enable up to eight users to access each carrier.

Enhanced data rates for GSM evolution (EDGE) technology is an upgrade to the GSM standard, providing higher data rates in the same frequency spectrum by using higher density modulation, 3π/8 rotating 8PSK modulation. The rotation prevents symbol transitions through the origin, reducing the peak-to-average power, thereby minimizing spectral re-growth and improving power efficiency. The 3π/8 rotating 8PSK is not a constant amplitude modulation; hence a standard Gaussian filter (non-linear) will distort the signal. Therefore, EDGE uses a special “linearized” version of the Gaussian filter from GSM resulting in a spectrum that is very similar to that of GSM, while minimizing non-linear distortion in the baseband signal.

EDGE Evolution or EGPRS2 is a technology to offer near-UMTS (universal mobile telecommunications system) level data throughput with more than double the spectrum efficiency. For a higher data rate, the EDGE Evolution signal configuration has normal burst (NB) and higher symbol rate (HSR) burst including new modulation formats such as QPSK, 16QAM, and 32QAM. New pulse shaping filters are defined as narrow and wide filters for HSR. This is necessary to adjust the HSR spectrum with normal EDGE mask tests because GSM, EDGE, and EDGE Evolution will coexist in commercial services.

Now included in 3GPP Release 9 is voice services over adap­tive multi-user channels on one slot (VAMOS). VAMOS can double the channel number assignment capacity of existing GSM networks by sending two sub channels on one slot. It utilizes adaptive QPSK (AQPSK), which is PSK with four state points whose positions are adjustable via a parameter Alpha.

RF Transmitter Tests

With the modular PXI VSAs, and the GSM/EDGE/EVO measurement application, you can perform RF transmitter measurements on BTS and mobile devices in time, frequency, and modulation domains. Measure basic GSM and EDGE sig­nals as well as EDGE Evolution signals with Level A (normal burst) and Level B (high symbol rate) with all modulation formats and transmit filters. In addition, MC-BTS and VAMOS transmitter measurements according to Release 9 of the 3GPP standard is supported.

For high-speed manufacturing, a single acquisition combined GSM/EDGE measurement is available where the speed is up to 20 times faster than traditional one-button measurements (for details refer to Ordering Information).

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