Technical Overviews
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
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