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Technical Overviews
Keysight Technologies
Pre-5G Modulation Analysis 89600 VSA Software 89601B/BN-BHN
Verizon 5G Physical Layer Overview
Verizon Wireless, in cooperation with ecosystem partners, published a 5G radio specifi[1]cation (http://www.5gtf.org/) targeting fixed wireless access at 28/39 GHz, with initial trials and deployments at 28 GHz. The air interface closely relates to the 3GPP Release 13 LTE specification, with several changes. Table 1 provides a physical layer (PHY) comparison between LTE and Verizon 5G. The Verizon 5G PHY is based on the OFDMA multiple access scheme in the DL and UL, with a dynamic TDD mode of operation whereby UL and DL resources are allocated based on immediate traffic needs. The motivation for moving to millimeter wave (mmWave) is the availability of large blocks of contiguous bandwidth. As such, a single component carrier bandwidth of 100 MHz is supported and up to 8 component carriers can be aggregated to create instantaneous bandwidth of up to 800 MHz.
Frame structure
The Verizon 5G radio frame is 10 ms long and consists of fifty 0.2 ms long subframes (Figure 1). Each subframe contains two slots, each consisting of 7 OFDM symbols in the time domain and 100 physical resource blocks (PRBs) in the frequency domain. Each PRB consists of 12 subcarriers with a spacing of 75 kHz. UL or DL transmission can be dynamically switched on a subframe basis, except for control subframes, which are used for synchronization, cell and beam search, and random access.
Physical channels and signals
Given the propagation loss at high frequencies, beamforming becomes necessary to handle the challenging link budget. Verizon 5G uses beamforming for all PHY channels and signals. Table 2 shows the PHY channels and signals for the Verizon 5G air interface.
Pre-5G Modulation Analysis
The 89600 VSA software option BHN provides comprehensive analysis capabilities in the frequency, time, and modulation domains for pre-5G signals based on the Verizon 5G open trial specification (http://5gtf.org/). By exporting setup files from Keysight signal creation software or manually-configured signal parameters, the software can detect and demodulate an input signal to quickly and easily run modulation quality measurements when characterizing a pre-5G signal under test. The software provides frequency-, time-, and modulation-domain analysis results in a single measurement. By configuring result traces of spectrum, acquisition time, and pre-5G specific modulation quality traces and tables, system engineers can identify overall signal characteristics and troubleshoot intermittent error peaks or repeated synchronization failures. For automated testing, .NET API and SCPI remote interfaces are available to accelerate system design, which enables quick transition to the design verification and manufacturing phase. The Verizon 5G standard is among over 75 signal standards and modulation types supported by the 89600 VSA software. The software is a comprehensive set of tools for demodulation and vector signal analysis. These tools enable you to explore virtually every facet of a signal and optimize even the most advanced designs. As you assess your design tradeoffs, the 89600 VSA helps you cut through the complexity.
Analysis and Troubleshooting Analyze all subframe configurations: control, DL control/data and UL control/data Option BHN supports modulation analysis measurements according to the Verizon 5G specification (Figure 2). Supported features include:
1. Pre-defined DL and UL subframe configurations.
2. UL and DL channels and signals with corresponding modulation formats and individual
power boosting.
3. Multiple transmission modes—single antenna, transmit diversity, and spatial
multiplexing—to demodulate single-port MIMO signals where the signals from two layers are not mixed.
Easy setup with complete parameter control
Use one of the preconfigured subframe configurations to easily configure your VSA, while still being able to adjust a wide range of signal parameters for troubleshooting. If you use Signal Studio for Pre-5G (N7630C), you can export 89601B .setx file for an even easier configuration. Dynamic Help allows you to access help text, and learn about the pre-5G format and presets available for option BHN. Detaching the Dynamic Help window and moving it to the side of the screen, as shown in Figure 3, enables easier viewing as it follows your menu choices. You can even lock it to stay fixed on important Help data topics
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