W1716EP SystemVue Digital Pre-Distortion Builder
Key Features & Specifications
- Provides advanced wideband algorithms for both PA modeling and pre-distortion
- Quickly assess wideband, dual-band RF components with 4G/5G 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 (> 1 GHz), 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 algorithms for crest-factor reduction (CFR), DPD, signal generation, and instrument control 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
- Adds support for simultaneous dual-band DPD, with cross-coupling coefficients between DPDs in arbitrarily-spaced bands (typically 20MHz CCs, but hundreds of MHz apart).
- Now choose from 4 Pre-distorter models and Extraction methodologies: Memory Polynomial, Volterra, Look-up Table (LUT), and User-Defined .m MATLAB algorithms.
- 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.
- New streamlined GUI and single-connection measurement methodology.
- 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.
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.
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.
- W1902 Digital Modem Library (recommended for Satellite formats)
- 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
Follow the link below to view all SystemVue configurations: