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10-2016

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Fachzeitschrift für Hochfrequenz- und Mikrowellentechnik

RF & Wireless Software

RF & Wireless Software OLYMP Engineering Designs a Complex LTE UMTS Repeater Using NI AWR Software The Design Challenge Designers at OLYMP Engineering were challenged to design an LTE universal mobile telecommunications system (UMTS) repeater (Figure 1) that would work with a very complex algorithm. Successful deployment would only be possible with exacting modeling and simulation, so NI AWR Design Environment, specifically Visual System Simulator (VSS) software, was chosen as the best solution for the design. OLYMP Enigneering LCC Yerevan Armenia www.olympengineering. com National Instruments www.ni.com/AWR Figure 1: The OLYMP Engineering LTE UMTS repeater OLYMP Engineering LLC is a leading company in the field of RF and wireless systems, offering its customers a range of communication and information technologies such as development of various communication protocols, algorithms, and RF hardware for different applications. The Solution One of the key requirements was that after the system was designed in VSS, it must be simulated and measured with real signals. Thanks to the tight integration between VSS and NI hardware/LabVIEW software, the designers were able to use LabVIEW to generate the LTE signal, then the NI vector signal transceiver (VST) to acquire Figure 2: RFP block diagram of UMTS transmitter with matching of components 54 hf-praxis 10/2016

RF & Wireless Figure 3: Single carrier UMTS transmitter diagram in VSS simulation environment that signal and, with LabVIEW call functions, use VSS to evaluate the model with the recorded signal. Why NI AWR Design Environment Figure 4: Dependence of output power, ACPR, and EVM on input power OLYMP Engineering designers chose VSS because of the tight integration with LabVIEW and NI hardware. The combined solution delivered innovative technologies in a single integrated platform that enabled higher productivity. The designers were impressed with the breadth of the VSS libraries and its unique models, as well as tools within VSS such as the radio frequency planning (RFP) utility. RFP enabled the engineers to complete the frequency planning quickly and avoid unexpected spurs in the signal bands of the UMTS repeater transmitter, as shown in Figure 2. The resulting design, as shown in Figure 3, was then used to perform various measurements (Figure 4) such as spectral compliance, adjacent channel power ratio (ACPR), and error vector magnitude (EVM), and was optimized in VSS to ensure that all the requirements were met. The design phase of the LTE repeater took only a week, enabling OLYMP to meet a very tight deadline before starting the real hardware development. The designers were even more pleased that first results showed good correlation to simulation results. ◄ CST Announces Technology Acquisition of Portunus System Simulator Computer Simulation Technology AG (CST) announces the acquisition of a source code license for the Portunus system simulator, a product of Adapted Solutions GmbH and the start of a multi-year collaboration contract. tools and offers comprehensive thermal and power electronics component libraries. CST’S acquisition of the Portunus source code, supported through Adapted Solutions, will enable this technology to be integrated seamlessly into the CST Studio Suite product environment. Access to the Portunus multi-domain system simulation will be available as an extension to the CST Studio Suite license. Models generated by CST simulation software can be implemented in Portunus system simulations, expanding the capabilities of both tools. System simulation helps engineers working on applications such as electrical, energy systems, power electronics and drives with many elements interacting in multiple domains. The Portunus simulator models systems using approaches such as network, block diagram and state machine in order to simulate electrical, mechanical and thermal systems in time and frequency domain as well as for steady-state (DC calculation) and operating point (OP). It also supports VHDL-AMS and SPICE to exchange models with other simulation “Being able to simulate entire systems unlocks new possibilities for hybrid and multi-domain simulation,” commented Dr. Peter Thoma, Managing Director, CST. “Our vision is to create a seamless system simulation environment for our customers, and the integration of Portunus into CST Studio Suite is a key part of this strategy.” ■ CST AG info@cst.com www.cst.com hf-praxis 10/2016 55

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