MaxEye DAB/DAB+/DMB Receiver Test Solution - Application Note

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This document describes the measurement configurations and procedures for DAB receiver testing using National Instruments PXI Vector Signal Generators and MaxEye DAB/DABPlus/T-DMB Signal Generation software.

Transcript of MaxEye DAB/DAB+/DMB Receiver Test Solution - Application Note

  • 1. DAB/DAB+/DMB Receiver Test Solution Application Note Using National Instruments PXI Vector Signal Generators, Vector Signal Transceivers and MaxEye DAB/DAB+/T-DMB Signal Generation Software

2. 2 Contents 1. Introduction ............................................................................................................................. 3 2. Test System Hardware and Software Requirements ............................................................... 3 2.1. Test Setup......................................................................................................................... 4 3. DAB/DAB+/T-DMB Signal Generation Software.................................................................. 5 3.1. Set up MaxEye DAB Signal Generation Software .......................................................... 6 4. Receiver Test Procedure........................................................................................................ 10 4.1. Receiver Performance Tests........................................................................................... 10 4.1.1 Sensitivity and Maximum Input Power Level Tests .................................................... 10 4.1.2 Receiver Performance in Multipath Fading Channel ................................................... 11 4.1.3 Receiver Selectivity Tests ............................................................................................ 15 4.1.4 Receiver Reacquisition Time........................................................................................ 16 4.2. Receiver Functionality Tests.......................................................................................... 17 5. MaxEye DAB/DAB+/DMB Toolkit API.............................................................................. 18 3. 3 1. Introduction Digital Audio Broadcasting (DAB) is a digital radio technology for broadcasting radio stations, used in several countries, particularly in Europe. The DAB family of standards includes DAB, DAB+ for digital radio and DMB for mobile TV. They are flexible, global and open standards and are a means for transmission of terrestrial digital radio signals. When the original DAB (Digital Audio Broadcasting) was first developed in the late 1980s, it was based on MPEG Audio Layer II coding, which is still commonly used in broadcasting today. The integration of AAC into DAB allowed higher efficiency, meaning the same audio quality at lower bitrates - hence the birth of DAB+. Another important innovation was the addition of video/multimedia capabilities to Digital Audio Broadcasting, allowing DAB to become a digital mobile television platform DMB (Digital Multimedia Broadcasting) as well as a multimedia digital radio platform. Both for DMB and DAB+ the technical basis remains DAB. This document describes the measurement configurations and procedures for DAB receiver testing using National Instruments PXI Vector Signal Generators and MaxEye DAB/DABPlus/T-DMB Signal Generation software. 2. Test System Hardware and Software Requirements The following are the hardware and software requirements for the test setup. Table 1 DAB, DAB+ and DMB Test Configuration Product Name Model Number Options NI PXI Chassis 8-Slot 3U PXI Express Chassis NI PXIe-1082 - NI PXI Controller 2.3 GHz Quad-Core PXI Express Controller NI PXIe-8135 4 GB Upgrade/Replacement RAM for PXIe-8135 NI Vector Signal Generator NI PXIe-5671 NI PXIe-5672 NI PXIe-5673/5673E NI PXIe-5644R/5645R/5646R With 512MB RAM NI RFSG driver version 1.7 or later MaxEye DAB Signal Generation Software MAXEYE-MET- DABTDMB_V001 - NI LabVIEW 2011, 2012 and 2013 NI Modulation Toolkit Version 4.3 or later 4. 4 The MaxEye DAB Signal Generation software is available for free 30-days evaluation in LabVIEW Tools Network. For more information about free evaluation of the MaxEye toolkit please write to info@maxeyetech.com. Download the software now from NI LabVIEW Tools Network and evaluate the software before you purchase. 2.1.Test Setup The diagram below shows the test setup using the hardware and software listed above. In the diagram NI PXIe-5673E is used as a Vector Signal Generator. Please see the table above to see the list of the other supported hardware. 5. 5 3. DAB/DAB+/T-DMB Signal Generation Software The MaxEye DAB signal generation toolkit extends LabVIEW tools and functions with National Instruments Vector Signal Generator to generate DAB/DAB+/DMB test signals that confirm to the ETSI standard specifications for various standards. Table 2 gives the details of the standard specifications for each of the supported standard. The toolkit coding, modulation and other parameters can be easily configured using the LabVIEW API VIs to generate custom waveform for specific test requirements. NI PXIe-5673E DAB/DAB+/DMB Receiver BER Receiver Sensitivity Channel Search (Manual/Auto) Search Results Analysis Channel Up/down time (Mute detection) Audio/Video Quality Analysis TS Packet Analysis EPG, Subtitles and other Receiver Functionality Tests DAB Signal Generation Figure 1 Test Setup for Receiver Performance and Functionality Tests 6. 6 Table 2 DAB/DAB+/DMB Standard Specifications Sl.no Standard Name Specifications 1 DAB/DAB+/DMB ETSI EN 300 401 V1.4.1 (2006-06) - Radio Broadcasting Systems; Digital Audio Broadcasting (DAB) to mobile, portable and fixed receivers ETSI TS 102 427 V1.1.1 (2005-07) - Digital Audio Broadcasting (DAB); Data Broadcasting - MPEG-2 TS streaming ETSI TS 102 428 V1.1.1 (2005-06) - Digital Audio Broadcasting (DAB); DMB video service; User Application Specification One of the significant feature of the toolkit is it allows storing the generated waveform in file and then playing the waveform in realtime using NI RFSG Streaming mode. This feature enables the testing of the received video/audio signals continuously for hours. The duration of the generated waveform in this mode is limited only by the available disk memory. The MaxEye Digital Video toolkit software provides support for MPEG 2 Transport streams as a one of the payload option with complete channel coding and modulation to support the specific needs of the design and verification of the digital video receivers, digital video transmitters and their components. The software also supports other payload options like Test Patterns, User Defined Bits, Binary file and PN Sequence. The toolkit coding, modulation and other parameters can be easily configured using the Labview API Vis to generate custom waveform for specific test requirements. The toolkit also supports adding impairments like AWGN, IQ impairments, frequency and clock offsets to stress the receivers under real world conditions. 3.1.Set up MaxEye DAB Signal Generation Software The following step by step procedure explains how to configure the signal generation software to generate DAB/DAB+ and DMB signals. 7. 7 Steps Operations User Configuration and Software Functionality Open the DAB Signal Generation Example Open LabVIEW 2011 or higher version Click Start > All Programs > MaxEye > Digital Video Toolkits > DAB_TDMB > Generation and open MaxEye DAB TDMB RFSG Signal Generation.vi Opens the front panel of the DAB signal generation example Configure the Hardware Settings Select Hardware Configuration Tab and configure the following properties Use the RFSG resource name configured in the NI MAX software for the VSG. Configure Carrier Frequency, Power Level, External Attenuation if used, Headroom and Arbitrary waveform generator pre-filter gain. Configure the Headroom value equivalent to the maximum expected PAPR value of the signal. The default value is 12dB Configure the DAB Standard specific Global Settings Select Global Configuration Tab and configure the following properties DAB has a number of country specific transmission modes (I, II, III and IV) based on the frequency band. Select the transmission mode. Configure Number of Transmission Frames to generate, this determines the duration of the selected waveform Select the Input mode, if the Input Mode is ETI File the Service and Subchannel configurations are read from the file. No other user configuration is required. 8. 8 WorldDMB forum provides ETI Library for the receiver testing. WorldDMB ETI Library assists receiver manufacturers in testing their products ensuring they include the minimum set of function requirements set out in the WorldDMB Receiver Profiles, making them compatible on a pan-European and worldwide basis If the Input Mode is user configuration configure the Number of Services and Subchannels and for each Subchannel configure the Protection Mode, Protection Level, Subchannel ID, UEP Table Index and EEP n value. Note: Standard uses two protection methods, UEP Unequal Error Protection and EEP Equal Error Protection Note: For BER measurements as per BS EN 50248 specification, BER should e measured in MSC using Equal Error Protection with code rate of . For this Protection Mode should be set to Long Form and Protection Level should be EEP-3A. Configure DAB Service Configurati on Settings Select the Service Configuration Tab and configure the following properties. If the Input Mode is ETI File skip this step. Set Service Level configurations like Service Reference number, Service Label and Number of Service components in each service. For each service component configure Transport Mechanism Id for DAB and DAB+ select MSC-Stream Mode (audio) for T-DMB select MSC-Stream Mode (Data). Select DABPlus as Audio Service 9. 9 Component Type for DABPlus mode. Select the subchannel identifier of the service component. Each subchannel carries one service component. For T-DMB mode set Data Service Component Type as T-DMB. Configure the Service component Identifier and label. Select the payload mode for DAB audio test choose MPEG Layer II audio and for DAB+ select MPEG4 HE AAC Version 2. For T-DMB testing select MPEG2TS file. The other suppo