W1716EP SystemVue Digital Pre-Distortion Builder
Key Features & Specifications
- Advanced 4G-ready algorithms for both PA modeling and pre-distortion
- Quickly assess 3G components for reuse in 4G systems with real 4G test vectors, without committing to a vendor-specific hardware implementation
- Step-by-step GUI wizard for easy set-up, extraction, and validation
- Links to the latest wideband test equipment (up to 800MHz), as well as simulators, such as Keysight ADS
- Accommodates proprietary DPD models, extraction IP, test vectors, and allows creation of a custom GUI
The W1716 Digital Pre-Distortion (DPD) Builder quickly models and corrects common sources of nonlinearities and memory effects in 4G power amplifiers and transceiver IC’s. It contains several sophisticated crest-factor reduction (CFR), DPD, signal generation, and instrument control capabilities rolled into a single, easy, wizard-based UI. System architects and RF component designers can use the W1716 to quickly assess and improve link-level performance, partitioning, and component selection. Baseband algorithm developers, RF architects and RF component designers can also use the W1716 to accelerate the actual implementation of linearization networks.
The W1716 DPD Builder is an add-on personality to the base W1461 SystemVue core environment.
- Read: Practical Digital Pre-Distortion Techniques for PA Linearization in 3GPP LTE
- Watch: Wideband DPD Using Keysight SystemVue and Keysight PXI Modular Hardware
- Webcast: Watch our July 26, 2012 webinar
Recently Added (as of SystemVue 2013.08)
- Now choose from 4 Pre-distorter models and Extraction methodologies: Memory Polynomial, Volterra, Look-up Table (LUT), and User-Defined .m math algorithms. LUT DPD is widely used for high-volume PA applications, such as mobile handsets, femtocells, and WLAN infrastructure.
- Built-in high-performance Crest-Factor Reduction (CFR) algorithms that work with virtually any modulation or standard, in addition to standards-specific CFR blocks for WCDMA, LTE, and LTE-A. Gives PA design teams access to commercial-grade CFR IP for realistic signal generation. Or just use the standalone CFR block in system-level simulations without DPD.
- New streamlined GUI and single-connection measurement methodology. Allows faster and repetitive test or simulation-based modeling automation.
- Choice of verification with or without automated power back-off.
- New support for M9381A VSG and M9391A VSA PXI Modular instruments, as well as wideband AWGs and digitizers.
- Swept EVM & ACP Verifications give you an early understanding of the correctability of a PA over a range of input powers and numbers of coefficients, prior to investing in a real-time hardware implementation
- Accepts custom IP and test waveforms, which allows researchers to control proprietary model and extraction algorithms but still use a supported, commercial modeling platform
See Measurement Solution Example: Digital Pre-Distortion (DPD)
Years of research, now minutes on the bench
The DPD process is simple, and only takes minutes. First, the W1716 DPD wizard downloads 4G or user defined waveforms to a Keysight signal generator to stimulate a real device. The distorted output carrier response is captured into SystemVue using a Keysight VSA. The W1716 DPD Builder then compares the output waveform to an undistorted passthrough waveform, and extracts a nonlinear memory polynomial (MP), Volterra, or Look-up Table (LUT) model. From the extracted model, the W1716 creates a digital pre-distortion network.
The DPD network minimizes adjacent-channel (ACP) spectral regrowth typically by 20dB (depending on amplifier and signal type). This allows higher operating power levels, extending the effective distance of the device. It also indirectly maximizes the DC-RF efficiency of infrastructure and handset PAs, reducing operating expenses, prolonging battery life, and increasing overall system throughput.
The same modeling approach can be used to predict DPD coefficients for simulated RF components in Keysight ADS and GoldenGate, and X-parameters. (For X-parameter support in SystemVue, refer to the W1719 RF System Design Kit.)
The W1716 puts high-performance, commercial-grade linearization IP into the hands of anyone in the 4G/mobility ecosystem, and uses simulation and calibrated test equipment to work around gaps in early prototypes, vendor relationships, hardware availability, and IP access (including test vectors, algorithms, and acceptance tests). The result is earlier and concurrent validation of system-level performance, in a neutral platform that can be shared easily between RF/PA, Baseband/FPGA, System, and Test/Compliance groups.
Figure 2. Verify your DPD results vs. input power or number of memory coefficients to quickly assess how correctable your analog PA design will be. Shown here is a result from a CMOS PA in Keysight GoldenGate.
Who should use Keysight’s W1716 DPD module?
- RF design & verification teams can quickly quantify the corrected performance of an Analog/RF amplifier for a particular systems integrator, using reconfigurable Keysight tools to fill important gaps, including IP access to test vectors and CFR/DPD algorithms, and wideband AWGs and digitizers. Keysight completes your virtual system.
- Baseband architects have a friendly, open platform to import existing linearization IP in .m, C++, and HDL formats, yet improve their connectivity to RF EDA models, Test & Measurement equipment, and trusted standards reference IP. Keysight brings key wireless strengths into your mainstream Digital/EDA flow.
- System architects can explore realistic system-level performance scenarios, propose solutions more quickly and aggressively, and directly exchange working design files with both Baseband and RF teams as the design flows into verification. Keysight unites your teams, enables higher system performance, and maximizes asset re-use.
- Aerospace/Defense architects will benefit just as much as Wireless. The same technology applies to MilComm, SatComm, and Radar systems, and because of the virtualized signal interfaces, allows flexible choices of AWGs, sources, and digitizers to accommodate almost any bandwidth.
Figure 3. SystemVue and Keysight instruments replace key components of your DPD training loop, allowing earlier offline validation of designs before they are committed to hardware. Algorithm designers can even virtualize the analog component, using co-simulation with ADS.
LTE and the Evolution to 4G Wireless Book
SystemVue applications featured in this book:
- MIMO channel/OTA
- Multi-Standard Radio (MSR)
- DPD, Crest-factor Reduction
- Integration with Test
For more information, refer to http://www.keysight.com/find/LTEbook
SystemVue Environment. W1716 DPD builder can be added to any SystemVue environment
- W1461 SystemVue Comms Architect
- W1462 SystemVue FPGA Architect
- W1464 SystemVue RF Architect
- W1465 SystemVue System Architect
Standards Libraries. The W1716 DPD builder allows users to define their own test vectors, and does not require additional libraries. However, the W1716 is most often used with the appropriate standards-based library, because of the convenient level of integration. Of all the SystemVue libraries quoted with the W1716 DPD builder, these are the most popular.
- W1910 LTE Baseband Verification Library
- W1916 3G Baseband Verification Library (recommended for “MSR” applications”, along with W1910 or W1918)
- W1917 WLAN Baseband Verification Library (includes 802.11ac)
- W1918 LTE-Advanced Baseband Verification Library
Test Equipment. The following hardware configurations are recommended most often with the W1716 DPD builder. (Refer to the configuration table in application note 5990-8883EN for more details):
Up to 160 MHz bandwidth:
- N5182B MXG signal generator, with internal baseband generator
- N9030A PXA signal analyzer
- 89601B VSA software, with Options 105, 300
Up to 250 MHz bandwidth:
- M9330A PXI arbitrary waveform generator
- E8267D PSG signal generator
- M9392A PXI Microwave vector signal analyzer
- 89601B VSA software, with Options 105, 300
Follow the link below to view all SystemVue configurations: