Basic Instrument Concept - Rohde & Schwarz R&S SLG Manual De Instrucciones

R&S SLG

2.2 Basic Instrument Concept

The SLG simulates an uplink or downlink. It has six modes: DVB 1, DVB 8, DVB 32,
Turbo 32, ISDB-S 32, and ISDB-S2 32. All modes are very similar in their functionality
but there are some differences as depicted in the following block diagrams. The
primary differences are the symbol rate range and number of carriers supported.
There are three kinds of carriers: data, load and AWG. Data carriers are generated by
an FEC block and they carry data from one of many possible sources. A load carrier
can be generated only by feeding a pseudorandom symbol stream to the constellation
mapper. It doesn't carry any data but does present a load to the receiver. Depending
on the receiver, it may or may not be possible to demodulate the carrier. An AWG
carrier is produced by feeding data from a waveform file to an intermediate point in the
digital upconverter. Depending on how that waveform file was produced, a receiver
may or may not be able to demodulate and/or decode it.
The following is a block diagram of DVB 1 mode, which supports a single DVB-S2
wideband carrier (compliant with Annex M) from 45 to 416 Msps. It can only support
one data, load, or AWG carrier and the data carrier can only be DVB-S2. It cannot be
DVB-S or DVB-DSNG.
Block Diagram for DVB 1 Mode
Getting Started 2116.9035.02 - 07
Brief Introduction
Basic Instrument Concept
15