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N6155A & W6155A ISDB-T with Tmm X-Series Measurement Application

Technical Overviews

ISDB-T with Tmm Digital Video Test Measurement Details 

This demonstration guide follows the list on this page, which shows the demonstrations included in this document. Each demonstration is given a brief description of its function and the corresponding measurement steps on the signal generator and/or signal analyzer. Most of the RF transmitter measurements as defined by the ISDB-T standard, as well as a wide range of additional measurements and analysis tools, are available with a press of a button. These measurements are fully remote controllable via the IEC/IEEE bus or LAN, using SCPI commands. Analog baseband measurements are available on the Keysight Technologies, Inc. PXA or MXA signal analyzer equipped with BBIQ hardware. Supported baseband measurements include all of the modulation quality plus I/Q waveform measurements. 

Demonstration Preparation 

The following demonstrations use the X-Series signal analyzer and the MXG N5182A vector signal generator. Keystrokes surrounded by [ ] indicate front-panel keys; keystrokes surrounded by { } indicate softkeys located on the display. 

Connect the PC, X-Series, and MXG 

Connect a PC (loaded with Keysight N7623B Signal Studio for Digital Video software and Keysight I/O libraries) to the N5182A MXG via GPIB or LAN. Follow the Signal Studio instructions to complete the connection, and then perform the following steps to interconnect the X-Series signal analyzer (see Figure 1 for a graphical overview): A. Connect the MXG RF Output port to the X-Series signal analyzer RF Input port B. Connect the MXG 10 MHz Out to the X-Series signal analyzer Ext Ref In port (rear panel) 

Set up ISDB-T/ISDB-Tmm Digital Video Signal Studio on MXG 

The Keysight N7623B Signal Studio for Digital Video is a Windows-based utility that simplifies the creation of standards-based or customized digital video signals. The waveform is downloaded into the MXG vector signal generator, which generates RF or IQ signals. 

Channel power 

The channel power measurement has two views: RF spectrum and shoulder attenuation. – RF spectrum view measures and reports the integrated power in an ISDB-T defined bandwidth and power spectral density (PSD) displayed in dBm/Hz or dBm/MHz. – Shoulder attenuation view measures shoulder attenuation compliant with the ISDB-T standard. 

Adjacent channel power (ACP) 

The ACP test verifies the ability of the modulator or transmitter to limit the interference produced by the transmitted signal to other receivers operating in the adjacent in-band or adjacent out-band RF channel. The limit can be defined to measure the power in adjacent channels relative to the transmitted power. The ACP measurement results should look like Figure 6. The text window shows the power in the adjacent channels. 

Power stat CCDF 

The power stat complementary cumulative distortion function (CCDF) is a statistical method used to interpret the peak-to-average ratio of digitally modulated noise-like signals. It is a key tool for the power ampliier design in ISDB-T/TSB/Tmm transmitters, which is particularly challenging because the ampliier must be capable of handling the high peakto- average ratio while maintaining good adjacent channel leakage performance. 

Spectrum emission mask 

The spectrum emission mask (SEM) measurement can compare the total power level within the defined carrier bandwidth and the given offset channel on both sides of the carrier frequency to levels allowed by the ISDB-T/TSB/Tmm standard. This measurement rebounds to the design of the power amplifier in the ISDB-T/ TSB/Tmm transmitter, and it is a key measurement linking amplifier inearity and other performance characteristics to the stringent system specifications. During the SEM measurement process, the amplitude correction function is employed to address situations where the dynamic range of the input signal may be larger than that of the signal analyzer. For more details, refer to Appendix A. To support all spectrum limits defined in ISDB-T/TSB standards, six limit types are available under the Meas Setup, Limit Type panel, as follows: – Manual – JEITA: defined in ARIB STD B31 – ABNT non-critical: defined in ABNT NBR 15601 – ABNT sub-critical: defined in ABNT NBR 15601 – ABNT critical: defined in ABNT NBR 15601 – ISDB-TSB: defined in ARIB STD B29 For JEITA limit type, there are another four options (auto sense, 30 dB mask, 40 dB mask, and 50 dB mask) that enable you to set the spectrum mask compliant with ARIB STD B31 version 1.7. For more details about ARIB STD B31 V.17 spectrum mask definition, use case, and settings in the N6155A and W6155A SEM measurement, refer to Appendix B. 

Modulation accuracy 

The modulation accuracy measurement is necessary to perform the ISDB-T-defined tests and to ensure proper operations. It provides the EVM, MER, magnitude error, phase error, frequency error, quadrature error, amplitude imbalance, channel frequency response, and channel impulse response results for ISDB-T/ TSB/Tmm signals. Additionally, for ISDB-T/TSB signals, you can measure the EVM/MER results on each layer or segment in I/Q error view, TMCC decoding results in the TMCC decoding view, and AC decoding results in AC decoding view which lists the earthquake information carried in the AC bits. For ISDB-Tmm signals, you can measure the EVM/MER results on each super segment, layer, or segment and check the ISDB-Tmm configurations for the current signal in the ISDB-Tmm config view. The procedure for and the results from making modulation accuracy measurements on ISDB-T/TSB and ISDB-Tmm signals are different and are introduced separately in this demo. 

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