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Digital Video Broadcasting (DVB) Transmitter
This example illustrates a DVB transmitter, based on the ETSI EN 300 744, V 1.5.1 (2004-06) technical specifications.
Configuration parameters are described below.
- TRANSMISSION_MODE determines the inner interleaving (Section 4.3.4) and signal constellation and mapping (Section 4.3.5). Available options are:
- QPSK Non-hierarchical
- 16QAM Non-hierarchical
- 64QAM Non-hierarchical
- 16QAM Hierarchical
- 64QAM Hierarchical
- OPERATION_MODE is defined in Section 4.1 and can be set to:
2K and 8K modes are defined for both DVB-T and DVB-H. 4K mode is used exclusively in DVB-H systems and is defined in Annex F.
- RANDOMIZE can disable randomization of input data, which may be useful for testing purposes. This is achieved by setting the RANDOMIZE parameter to Off.
- CODE_RATE determines the rate of the convolutional inner encoder. Available rates are:
- MOD_ALPA determines constellation proportions (Section 4.3.5). It is always 1 for Non-hierarchical modes, so in this case it is ignored. The available settings for Hierarchical modes are:
- CHANNEL_BW defines the standard channel spacing defined in Section 4.1. Available options are:
- 8 MHz
- 7 MHz
- 6 MHz
- 5 MHz
5 MHz channel spacing is defined for use outside the traditional broadcast bands and parameters for operating with such spacing are given in Annex G.
- G determines the guard interval for the OFDM modulation. The available options are:
- TX_OUT_LEVEL determines the output level of the transmitter and is defined in units defined in Options/Project Options/Global Units, in the Power window.
- TX_CARRIER_FREQ determines the carrier frequency in units defined in Options/Project Options/Global Units, in the Frequency entry.
- SMPSYM determines the number of samples per symbol used at the transmitter.
This example implements a typical Device-Under-Test (DUT), which includes amplitude and phase imbalance, DC offset, phase noise, and a file-based power amplifier. The test bench monitors the following measurements:
- The CCDF at the input and output of the
- The signal spectrum at the input and output of the
- EVM %rms vs. output
- AM-to-AM conversion caused by the power
- Distortion of the signal constellation caused by the power amplifier
Note the amplifier model is based on a text data file. It can be replaced with an MWO circuit or a VSS behavioral amplifier model that accounts for frequency dependency. This test bench is used to illustrate several capabilities of VSS.