Rohde & Schwarz R&S SMM-K548 User Manual
Rohde & Schwarz R&S SMM-K548 User Manual

Rohde & Schwarz R&S SMM-K548 User Manual

Crest factor reduction

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®
R&S
SMM-K548
Crest Factor Reduction
User Manual
(;ÝGI2)
1179232502
Version 06

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Summary of Contents for Rohde & Schwarz R&S SMM-K548

  • Page 1 ® R&S SMM-K548 Crest Factor Reduction User Manual (;ÝGI2) 1179232502 Version 06...
  • Page 2 This document describes the following software options: ● R&S ® SMM-K548 Crest Factor Reduction (1441.1130.xx) ® This manual describes firmware version FW 5.30.175.80 and later of the R&S SMM100A. © 2024 Rohde & Schwarz Muehldorfstr. 15, 81671 Muenchen, Germany Phone: +49 89 41 29 - 0 Email: info@rohde-schwarz.com Internet:...
  • Page 3: Table Of Contents

    ® Contents R&S SMM-K548 Contents 1 Welcome to the R&S SMM-K548 option..........5 Accessing Crest Factor Reduction settings...............5 What's new........................5 Documentation overview....................6 1.3.1 Getting started manual....................6 1.3.2 User manuals and help....................6 1.3.3 Service manual....................... 6 1.3.4 Instrument security procedures..................7 1.3.5 Printed safety instructions....................
  • Page 4 ® Contents R&S SMM-K548 User Manual 1179.2325.02 ─ 06...
  • Page 5: Welcome To The R&S Smm-K548 Option

    ® Welcome to the R&S SMM-K548 option R&S SMM-K548 What's new 1 Welcome to the R&S SMM-K548 option Option R&S SMM-K548 is a software option that allows you to generate baseband sig- nals with reduced crest factor. R&S SMM-K548 key features ●...
  • Page 6: Documentation Overview

    ® Welcome to the R&S SMM-K548 option R&S SMM-K548 Documentation overview ● Editorial changes 1.3 Documentation overview This section provides an overview of the R&S SMM100A user documentation. Unless specified otherwise, you find the documents at: www.rohde-schwarz.com/manual/smm100a 1.3.1 Getting started manual Introduces the R&S SMM100A and describes how to set up and start working with the product.
  • Page 7: Instrument Security Procedures

    ® Welcome to the R&S SMM-K548 option R&S SMM-K548 Documentation overview 1.3.4 Instrument security procedures Deals with security issues when working with the R&S SMM100A in secure areas. It is available for download on the internet. 1.3.5 Printed safety instructions Provides safety information in many languages.
  • Page 8: Videos

    ® Welcome to the R&S SMM-K548 option R&S SMM-K548 Notes on screenshots 1.3.10 Videos Find various videos on Rohde & Schwarz products and test and measurement topics on YouTube: https://www.youtube.com/@RohdeundSchwarz On the menu bar, search for your product to find related videos. Figure 1-1: Product search on YouTube 1.4 Scope Tasks (in manual or remote operation) that are also performed in the base unit in the...
  • Page 9: About The Crest Factor Reduction

    ® About the crest factor reduction R&S SMM-K548 2 About the crest factor reduction Communication standards utilizing higher order modulation techniques or using multi- ple carrier and complex signals consisting of the signals of more than one digital stan- dard can feature a high crest factor. The signals of some digital standards can have high crest factors also particularly with many channels and long sequences.
  • Page 10 ® About the crest factor reduction R&S SMM-K548 The cancellation pulse bandwidth is configurable and the cancellation pulse transition bandwidth. The achieved resulting crest factor can be higher than expected, because of filters in the signal processing chain increasing the crest factor again after a previous crest factor reduction.
  • Page 11: Crest Factor Reduction Settings

    ® Crest factor reduction settings R&S SMM-K548 3 Crest factor reduction settings Access: ► Select "Baseband" > "ARB" > "Crest Factor Reduction". The dialog provides settings to configure and enable crest factor reduction. Enabling crest factor reduction Crest factor reduction requires an enabled "ARB" state and a valid waveform file loa- ded to the ARB application.
  • Page 12: State

    ® Crest factor reduction settings R&S SMM-K548 Maximum Filter Order....................15 Cancellation Pulse Bandwidth..................15 Transition Bandwidth.....................15 State Requires an active "ARB" state, see "Enabling crest factor reduction" on page 11. Activates crest factor reduction calculation. Note: You cannot activate the crest factor reduction and the notch filter simultaneously. Enabling the notched filter automatically disables the crest factor reduction.
  • Page 13: Original Crest Factor

    ® Crest factor reduction settings R&S SMM-K548 Original Crest Factor Displays the original crest factor of the waveform after the calculation of the resulting crest factor is completed. The original crest factor is calculated as an average over the whole waveform, including any idle periods that can be present in TDD waveforms. Remote command: on page 20 [:SOURce<hw>]:BB:ARBitrary:CFR:OCFactor?
  • Page 14: Channel Spacing

    ® Crest factor reduction settings R&S SMM-K548 "Enhanced" In the enhanced filter mode, you can specify the passband and stop- band frequencies of the lowpass filter. Figure 3-2: Enhanced filter mode Remote command: on page 19 [:SOURce<hw>]:BB:ARBitrary:CFR:FILTer Channel Spacing Requires "Algorithm" > "Clipping and Filtering" and "Filter Mode" > "Simple". Sets the channel spacing.
  • Page 15 ® Crest factor reduction settings R&S SMM-K548 Maximum Filter Order Requires "Algorithm" > "Clipping and Filtering" and "Filter Mode" > "Enhanced". Sets the maximum filter order. Remote command: on page 20 [:SOURce<hw>]:BB:ARBitrary:CFR:FORDer Cancellation Pulse Bandwidth Requires "Algorithm" > "Peak Cancellation". Sets the bandwidth of the cancellation pulse.
  • Page 16: Remote Control Commands

    ® Remote control commands R&S SMM-K548 4 Remote control commands The following commands are required to perform signal generation in a remote envi- ronment. We assume that the R&S SMM100A has already been set up for remote operation in a network as described in the R&S SMM100A user manual. Knowledge about the remote control operation and the SCPI command syntax is assumed.
  • Page 17 ® Remote control commands R&S SMM-K548 SOURce1:BB:ARBitrary:CFR:CSPacing 20E6 SOURce1:BB:ARBitrary:CFR:SBANdwidth 18E6 // Configure enhanced filtering. SOURce1:BB:ARBitrary:CFR:FILTer ENHanced SOURce1:BB:ARBitrary:CFR:PFReq 9E6 SOURce1:BB:ARBitrary:CFR:SFReq 11E6 SOURce1:BB:ARBitrary:CFR:FORDer 100 Example: Applying peak cancellation algorithm // Set for peak cancellation CFR algorithm. SOURce1:BB:ARBitrary:CFR:ALGorithm PCANcellation SOURce1:BB:ARBitrary:CFR:DCFDelta -3 // Set a cancellation pulse bandwidth of 800 kHz. SOURce1:BB:ARBitrary:CFR:CPBandwidth 800000 // Set a transition bandwidth of 10 kHz.
  • Page 18: [:Source]:Bb:arbitrary:cfr[:State]

    ® Remote control commands R&S SMM-K548 ................ 22 [:SOURce<hw>]:BB:ARBitrary:CFR:SFReq ..............22 [:SOURce<hw>]:BB:ARBitrary:CFR:TBANdwidth ............23 [:SOURce<hw>]:BB:ARBitrary:CFR:WAVeform:CREate [:SOURce<hw>]:BB:ARBitrary:CFR[:STATe] <ArbCfrState> Enables the crest factor reduction calculation. Parameters: <ArbCfrState> 1 | ON | 0 | OFF *RST: Example: Example "Activating and monitoring CFR characteristics" on page 17.
  • Page 19: [:Source]:Bb:arbitrary:cfr:cspacing

    ® Remote control commands R&S SMM-K548 Example: Example "Applying peak cancellation algorithm" on page 17. Manual operation: "Cancellation Pulse Bandwidth" on page 15 [:SOURce<hw>]:BB:ARBitrary:CFR:CSPacing <ArbCfrChanSpac> Sets the channel spacing, if is set to [:SOURce<hw>]:BB:ARBitrary:CFR:FILTer SIMPle. Parameters: <ArbCfrChanSpac> float Range: 0 to depends on the sample rate of the loaded file Increment: 0.1 *RST: 250E6...
  • Page 20: [:Source]:Bb:arbitrary:cfr:forder

    ® Remote control commands R&S SMM-K548 [:SOURce<hw>]:BB:ARBitrary:CFR:FORDer <ArbCfrMaxFilOrd> Sets the maximum filter order, if [:SOURce<hw>]:BB:ARBitrary:CFR:FILTer set to ENHanced. Parameters: <ArbCfrMaxFilOrd> integer Range: 0 to 300 *RST: Example: Example "Applying clipping and filtering algorithm" on page 16. Manual operation: "Maximum Filter Order" on page 15 [:SOURce<hw>]:BB:ARBitrary:CFR:ITERations <ArbCfrMaxIter>...
  • Page 21: [:Source]:Bb:arbitrary:cfr:pfreq

    ® Remote control commands R&S SMM-K548 Return values: <ArbCfrOCrestFac> float Range: 1 to 100 Increment: 0.01 *RST: Example: Example "Activating and monitoring CFR characteristics" on page 17. Usage: Query only Manual operation: "Original Crest Factor" on page 13 [:SOURce<hw>]:BB:ARBitrary:CFR:PFReq <ArbCfrPassBFreq> Sets the passband frequency, if [:SOURce<hw>]:BB:ARBitrary:CFR:FILTer set to ENHanced.
  • Page 22: [:Source]:Bb:arbitrary:cfr:sbandwidth

    ® Remote control commands R&S SMM-K548 [:SOURce<hw>]:BB:ARBitrary:CFR:SBANdwidth <ArbCfrSignalBw> Sets the signal bandwidth, if is set [:SOURce<hw>]:BB:ARBitrary:CFR:FILTer to SIMPle. The value of the signal bandwidth should not be higher than the channel spacing SOURce<hw>]:BB:ARBitrary:CFR:CSPacing). Parameters: <ArbCfrSignalBw> float Range: 0 to depends on the sample rate of the loaded file Increment: 0.1 *RST: 250E6...
  • Page 23 ® Remote control commands R&S SMM-K548 [:SOURce<hw>]:BB:ARBitrary:CFR:WAVeform:CREate <CreateWvFile> With enabled signal generation, triggers the instrument to save the current settings in a waveform file. Waveform files can be further processed. The filename and the directory it is saved in are user-definable; the predefined file extension for waveform files is *.wv.
  • Page 24: List Of Commands

    ® List of commands R&S SMM-K548 List of commands [:SOURce<hw>]:BB:ARBitrary:CFR:ALGorithm....................18 [:SOURce<hw>]:BB:ARBitrary:CFR:CPBandwidth..................18 [:SOURce<hw>]:BB:ARBitrary:CFR:CSPacing....................19 [:SOURce<hw>]:BB:ARBitrary:CFR:DCFDelta....................19 [:SOURce<hw>]:BB:ARBitrary:CFR:FILTer..................... 19 [:SOURce<hw>]:BB:ARBitrary:CFR:FORDer....................20 [:SOURce<hw>]:BB:ARBitrary:CFR:ITERations....................20 [:SOURce<hw>]:BB:ARBitrary:CFR:MEASure[:STATe]?.................20 [:SOURce<hw>]:BB:ARBitrary:CFR:OCFactor?....................20 [:SOURce<hw>]:BB:ARBitrary:CFR:PFReq....................21 [:SOURce<hw>]:BB:ARBitrary:CFR:RCFactor?....................21 [:SOURce<hw>]:BB:ARBitrary:CFR:SBANdwidth................... 22 [:SOURce<hw>]:BB:ARBitrary:CFR:SFReq....................22 [:SOURce<hw>]:BB:ARBitrary:CFR:TBANdwidth................... 22 [:SOURce<hw>]:BB:ARBitrary:CFR:WAVeform:CREate................. 23 [:SOURce<hw>]:BB:ARBitrary:CFR[:STATe]....................18 User Manual 1179.2325.02 ─ 06...
  • Page 25: Index

    ® Index R&S SMM-K548 Index Service manual ..............6 Specifications ..............7 Application cards ..............7 Application notes ..............7 User manual ................ 6 Brochures ................7 Videos ................. 8 Calibration certificate ............7 What's new ................5 Algorithm ..............12 White papers ...............

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