DTMB (CTTB) X-Series Measurement Application N6156A & W6156A

• Measure DTMB (CTTB) transmitters, exciters, modulators, gap-fillers, tuners, or amplifiers performance
• Perform one-button tests with pass/fail limit per DTMB (CTTB) standards
• Use hardkey/softkey manual user interface or SCPI remote user interface
• Leverage built-in, context-sensitive help
• Move the application between X-Series signal analyzers with transportable licensing

The Keysight Technologies, Inc. DTMB (CTTB) measurement applica­tion provides one-button standard-based power and modulation analysis capabilities to help your design, evaluation, and manufacturing of DTMB (CTTB) modulators, transmit­ters, amplifiers, tuners, and gap-fill­ers/repeaters. Furthermore, with the optional analog baseband IQ inputs in the PXA or MXA signal analyzer, it can provide you the flexibility of mea­suring the signal quality and modula­tion accuracy with RF input or analog IQ input.

The DTMB (CTTB) measurement application is just one in a common library of more than 25 measurement applications in the Keysight X-Series, an evolutionary approach to signal analysis that spans instrumentation, measurements, and software. The X-Series analyzers, with upgradeable CPU, memory, disk drives, and I/O ports, enable you to keep your test assets current and extend instrument longevity. Proven algorithms, 100% code-compatibility, and a common UI across the X-Series create a consis­tent measurement framework for sig­nal analysis that ensures repeatable results and measurement integrity so you can leverage your test system software through all phases of prod­uct development. In addition to fixed, perpetual licenses for our X-Series measurement applications, we also offer transportable licenses which can increase the value of your invest­ment by allowing to you transport the application to multiple X-Series analyzers

Key parameter setup

Carrier mode: OFDM (C = 3780) and single carrier (C = 1)

Device type: Transmitter/exciter

Bandwidth: 6 and 8 MHz

Header type: PN 420/595/945

Modulation: 4QAM-NR/4QAM/16QAM/32QAM/64QAM

Input: RF or analog IQ (available in the N9030A PXA or N9020A MXA) for signal quality and modulation accuracy measure­ments

Technology Overview

Digital terrestrial/television multi­media broadcasting (DTMB), also known as China terrestrial television broadcasting (CTTB), is the Chi­nese national terrestrial digital TV broadcasting standard which was announced on August 18, 2006 and implemented from August 1, 2007.

DTMB supports both multi-carrier (C=3780) and single-carrier (C=1) modulation scheme. Both schemes use low density parity check (LDPC) coding in forward error correction (FEC), which can provide superior error correction capability for a bet­ter sensitivity especially at higher code rate. Time domain synchronized orthogonal frequency division multi­plexing (TDS-OFDM ) is implemented to deliver fast system synchronization and precise channel estimation.

The DTMB (CTTB) measurement ap­plication gives more convenience to your DTMB (CTTB) system develop­ment and manufacturing, including both multi-carrier and single-carrier schemes with one-button measure­ments including standard presets and remote SCPI programming capabili­ties on X-Series signal analyzers

The RF transmitter test requirements for DTMB transmitter and exciter are defined in GY/T 229.4 2008 and GY/T 229.2 2008 standards. Table 1 shows RF transmitter and exciter tests defined by the specification along with the corresponding measure­ments provided by the DTMB (CTTB) measurement application

All of the RF transmitter measure­ments as defined by the DTMB (CTTB) 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 PXA or MXA signal analyzer equipped with BBIQ hardware. Supported baseband mea­surements include all of the modula­tion quality plus I/Q waveform and CCDF measurements