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               Using SystemVue to Integrate
               a Flexible R&D Testbed for LTE



               Application Note


Introduction   As wireless communications evolve, the structure of wireless systems is becom-
               ing ever more complex. New test signals and measurements are needed to test
               the performance of these systems according to the quickly evolving wireless
               standards. Sometimes, however, the required waveforms and measurements
               are not available on existing hardware instruments. At such times it is valuable
               to have software in the test system that can generate the new waveforms and
               perform advanced measurements.

               To construct test systems that meet the requirements of new wireless standards,
               a number of different instruments are used. If we simply connect these instru-
               ments one by one and manually configure the test system, the task of getting
               this system to operate correctly will be difficult and time-consuming. A much
               more efficient approach is to integrate all the instruments and automate the
               system-level performance tests using a software tool.

               System-level performance tests usually require a golden transmitter and a golden
               receiver to provide test references. However, during the initial development of
               a new product, the product's transmitter and receiver are not yet complete. It is
               useful, therefore, to have a software receiver to test the new product design and
               early hardware.

               This application note describes an integrated solution for testing wireless
               communication systems based on the quickly evolving LTE standard. Agilent
               SystemVue is recommended as the core software in this test solution to
               integrate all test instruments, create new test waveforms, enable advanced mea-
               surements, and provide a software reference receiver. An integrated test system
               configured for LTE base station receiver measurements is used as an example. It
               is well known that receiver sensitivity is an important measurement for describ-
               ing LTE receiver performance. To test receiver sensitivity according to the latest
               3GPP LTE specifications, Agilent proposes a test system using SystemVue with a
               built-in reference receiver and certain auto-configuration capabilities. In this con-
               figuration, this system can be used to test both frequency division duplex (FDD)
               and time division duplex (TDD) uplink receivers that are specified in LTE. Receiver
               performance curves for throughput vs. signal-to-noise ratio and for block-error-
               rate vs. signal-to-noise ratio are generated quickly, with reasonable test accuracy.
Test System Structure and Functions

                           The basic configuration of the integrated test system, shown in Figure 1, includes
                           the SystemVue software, a device under test (DUT), and instruments such as
                           vector signal generators with deep ARB memory, vector signal analyzers with
                           deep capture memory, and a channel emulator. In this configuration, baseband
                           data is generated by SystemVue and sent to the PXB channel emulator. Faders
                           can be used in the channel emulator to set up single input-single output (SISO)
                           or multiple input-multiple output (MIMO) channels with multipath fading. The
                           signal generators, driven by the channel emulator, generate receiver RF and
                           IF signals that are used for testing the DUT. The signal analyzers capture the
                           received signals from the DUT outputs and send them back to SystemVue. In the
                           SystemVue platform, the software receiver can demodulate, deframe, and decode
                           received signals and provide a measure of receiver performance. In Figure 1, the
                           test data flow is indicated by the red arrows.

                           SystemVue plays the key role in integrating all the instruments in the test
                           system. The flow of test system control is shown in Figure 1 by the blue arrows.
                           The main functions of SystemVue include the following:
                           

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