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N6158A & W6158A CMMB X-Series Measurement Application

Technical Overviews

Demo Guide

Introduction

This demonstration guide follows the list from page 2, 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.  

CMMB Measurement Details

Measurement Details

All of the RF transmitter measurements as defined by the CMMB standard, as well as a wide range of additional measurements and analysis tools, are available with a press of a button (Table 2). 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. MXA signal analyzer equipped with BBIQ hardware. Supported baseband measurements include all of the modulation quality plus I/Q waveform and CCDF measurements. 

Demonstration Preparation

Minimum equipment configuration requirements

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

Demonstration Setup

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 instruction to complete the connection, and then perform the following steps to interconnect the X-Series signal analyzer and MXG (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) 

Demonstration 1:

Set up Signal Studio for Digital Video setup on an N5182A 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. 

Demonstration 2:

Channel power 

The channel power measurement has two views: RF Spectrum and shoulder attenuation. 

– The RF spectrum view measures and reports the integrated power in a CMMB defined bandwidth and power spectral density (PSD) displayed in dBm/Hz or dBm/MHz 

– The shoulder attenuation view measures the power difference between the center frequency (CF) and the shoulder point (4.2 MHz from CF)

Demonstration 3:

Adjacent channel power (ACP) 

ACP is a measurement of the power in adjacent in-band or out-band channels relative to the transmitted power. The ACP test verifies the ability of the modulator or transmitter to limit the interference produced by the transmitted signal to other receivers operating at the adjacent in-band or adjacent out-band RF channel. 

The ACP measurement results should be similar to Figure 5. The text window shows the power inside and outside the adjacent channels as the standard requires. 

Demonstration 4:

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 amplifier design in CMMB transmitters, which is particularly challenging because the amplifier must be capable of handling the high peak-to-average ratio while maintaining good adjacent channel leakage performance. 

Demonstration 5:

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 CMMB standard.

This measurement rebounds to the design of the power amplifier in the CMMB transmitter, and it is a key measurement linking amplifier linearity and other performance characteristics to the stringent system specifications. 

In an SEM measurement, you may need to use the amplitude correction function. For more details, refer to Appendix A. 

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