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

Rohde & Schwarz R&S SMCVB-K548 User Manual

Crest factor reduction
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R&S
SMCVB-K548
Crest Factor Reduction
User Manual
(;Ý<ë2)
1179129302
Version 05

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

  • Page 1 ® R&S SMCVB-K548 Crest Factor Reduction User Manual (;Ý<ë2) 1179129302 Version 05...
  • Page 2 This document describes the following software options: ● R&S ® SMCVB-K548 Crest Factor Reduction (1434.5640.xx) ® This manual describes firmware version FW 5.20.043.xx and later of the R&S SMCV100B. © 2023 Rohde & Schwarz GmbH & Co. KG Muehldorfstr. 15, 81671 Muenchen, Germany Phone: +49 89 41 29 - 0 Email: info@rohde-schwarz.com...

  • Page 3: Table Of Contents

    ® Contents R&S SMCVB-K548 Contents 1 Welcome to the R&S SMCVB-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 SMCVB-K548 User Manual 1179.1293.02 ─ 05...

  • Page 5: Welcome To The R&S Smcvb-K548 Option

    ® Welcome to the R&S SMCVB-K548 option R&S SMCVB-K548 What's new 1 Welcome to the R&S SMCVB-K548 option The R&S SMCVB-K548 is a software option that allows you to generate signals with reduced crest factor. R&S SMCVB-K548 key features ● Reduces the crest factor of a baseband signal through clipping the high signal peaks and filtering the waveform afterwards.

  • Page 6: Documentation Overview

    ® Welcome to the R&S SMCVB-K548 option R&S SMCVB-K548 Documentation overview Compared to the previous version, it provides peak cancellation algorithm for crest fac- tor reduction: ● Background information on the algorithm "Peak cancellation algorithm" on page 9 ● Algorithm settings, see "Algorithm"...

  • Page 7: Instrument Security Procedures

    ® Welcome to the R&S SMCVB-K548 option R&S SMCVB-K548 Documentation overview The service manual is available for registered users on the global Rohde & Schwarz information system (GLORIS): https://gloris.rohde-schwarz.com 1.3.4 Instrument security procedures Deals with security issues when working with the R&S SMCV100B in secure areas. It is available for download on the internet.

  • Page 8: Videos

    ® Welcome to the R&S SMCVB-K548 option R&S SMCVB-K548 Notes on screenshots 1.3.9 Videos Find various videos on Rohde & Schwarz products and test and measurement topics on YouTube: https://www.youtube.com/@RohdeundSchwarz 1.4 Scope Tasks (in manual or remote operation) that are also performed in the base unit in the same way are not described here.

  • Page 9: About The Crest Factor Reduction

    ® About the crest factor reduction R&S SMCVB-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 SMCVB-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 SMCVB-K548 3 Crest factor reduction settings Access: ► Select "Baseband" > "ARB" > "Crest Factor Reduction". The dialog provides settings to configure and activate crest factor reduction. Activating crest factor reduction Crest factor reduction requires an active "ARB" state and a valid waveform file loaded to the ARB application.
  • Page 12 ® Crest factor reduction settings R&S SMCVB-K548 Signal Bandwidth......................14 Stopband Frequency.....................14 Passband Frequency....................14 Maximum Filter Order....................15 Cancellation Pulse Bandwidth..................15 Transition Bandwidth.....................15 State Requires an active "ARB" state, see "Activating crest factor reduction" on page 11. Activates crest factor reduction calculation. Note: You cannot activate the crest factor reduction and the notch filter simultaneously.
  • Page 13 ® Crest factor reduction settings R&S SMCVB-K548 Remote command: on page 20 [:SOURce<hw>]:BB:ARBitrary:CFR:ITERations 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.
  • Page 14 ® Crest factor reduction settings R&S SMCVB-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 SMCVB-K548 Maximum Filter Order Requires "Algorithm" > "Clipping and Filtering" and "Filter Mode" > "Enhanced". Sets the maximum filter order. Remote command: on page 19 [: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 SMCVB-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 SMCV100B has already been set up for remote operation in a network as described in the R&S SMCV100B user manual. Knowledge about the remote control operation and the SCPI command syntax is assumed.
  • Page 17 ® Remote-control commands R&S SMCVB-K548 // Configure simple filtering. SOURce1:BB:ARBitrary:CFR:FILTer SIMPle 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.

  • Page 18: [:Source]:Bb:arbitrary:cfr[:State]

    ® Remote-control commands R&S SMCVB-K548 ................ 22 [:SOURce<hw>]:BB:ARBitrary:CFR:SFReq ..............22 [:SOURce<hw>]:BB:ARBitrary:CFR:TBANdwidth ............22 [: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. Manual operation: "State"...

  • Page 19: [:Source]:Bb:arbitrary:cfr:cspacing

    ® Remote-control commands R&S SMCVB-K548 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:iterations

    ® Remote-control commands R&S SMCVB-K548 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> Sets the number of iterations that are used for calculating the resulting crest factor. The iteration process is stopped when the desired crest factor delta is achieved by 0.1 dB.

  • Page 21: [:Source]:Bb:arbitrary:cfr:pfreq

    ® Remote-control commands R&S SMCVB-K548 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. Frequency components lower than the passband frequency are passed through unfiltered.
  • Page 22 ® Remote-control commands R&S SMCVB-K548 Parameters: <ArbCfrSignalBw> float Range: 0 to depends on the sample rate of the loaded file Increment: 0.1 *RST: 250E6 Example: Example"Applying clipping and filtering algorithm" on page 16. Manual operation: "Signal Bandwidth" on page 14 [:SOURce<hw>]:BB:ARBitrary:CFR:SFReq <ArbCfrStopBFreq>...
  • Page 23 ® Remote-control commands R&S SMCVB-K548 Example: Example"Activating and monitoring CFR characteristics" on page 17. Usage: Setting only Manual operation: "Generate Waveform" on page 12 User Manual 1179.1293.02 ─ 05...

  • Page 24: List Of Commands

    ® List of commands R&S SMCVB-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....................19 [: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................... 21 [:SOURce<hw>]:BB:ARBitrary:CFR:SFReq....................22 [:SOURce<hw>]:BB:ARBitrary:CFR:TBANdwidth................... 22 [:SOURce<hw>]:BB:ARBitrary:CFR:WAVeform:CREate................. 22 [:SOURce<hw>]:BB:ARBitrary:CFR[:STATe]....................18 User Manual 1179.1293.02 ─ 05...

  • Page 25: Index

    ® Index R&S SMCVB-K548 Index Application cards ..............7 User manual ................ 6 Application notes ..............7 Videos ................. 8 Brochures ................7 What's new ................5 White papers ............... 7 Algorithm ..............12 Cancellation pulse bandwidth ........15 Channel spacing ............14 Desired delta ...............

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