Rohde & Schwarz generates, analyses 5G signals as per ‘Verizon 5G Open Trial Specifications’


United States —

Rohde & Schwarz has demonstrated the generation and analysis of 5G network signals according to the characteristics as per the ‘Verizon open trial specifications’.

Rohde & Schwarz said in a press statement that the R&S SMW200A vector signal generator and the R&S FSW signal and spectrum analyzer both provide outstanding test and measurement capabilities, resulting in an EVM performance of 1 % when applying these 5G signals.

In July 2016, Verizon Wireless, along with SK Telecom, KT Corp, NTT DOCOMO, and other leading infrastructure, chipset and terminal manufacturers, published 5G technical specifications describing the physical layer characteristics of a 5G signal. The specified signal is derived from LTE and adapted to be used at cm frequencies, initially 28 GHz but also 39 GHz. Those frequencies were recently allocated for 5G wireless communications by the US telecom regulator, the Federal Communications Commission (FCC). The proprietary signal is a multicarrier OFDM signal with a subcarrier spacing of 75 kHz. It is aiming for a bandwidth of 100 MHz per component carrier. Up to eight carriers can be aggregated. The basic mode of operation is TDD.

R&S said that owing to their built-in flexibility, the Rohde & Schwarz signal generation and analysis instruments already support the basic characteristic of the specified 5G Verizon signal. The R&S SMW200A vector signal generator equipped with the R&S SMW-K114 5G waveform candidate software option makes it easy to configure OFDM signals with the required 75 kHz subcarrier spacing and 100 MHz bandwidth. Additionally, preamble and user data settings enable creation of 5G signal with the basic characteristics as specified by the Verizon 5G technical forum. This means that reference symbols can be set, and data modulation such as QPSK, 16QAM, 64QAM and even higher-order modulation schemes such as 256QAM can be applied.

Using the R&S FS-K96 OFDM vector signal analysis software in combination with the R&S FSW signal and spectrum analyzer allows the full characterization of such a 5G signal by simply loading into the software a configuration file that reflects the parameterization of the 5G Verizon signal.

When characterizing DUTs such as newly developed power amplifiers for the cm frequency range, test instruments themselves can influence the measurement results. Rohde & Schwarz said that it achieved outstanding performance with the R&S SMW200A and R&S FSW in the trial. When using the test instruments to measure the EVM of a 5G signal at 28 GHz, measurement results were below 1 % across a 10 dB power sweep, meaning that the test instruments did not impact the measurement.