RF signal monitoring

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DVB-T2 networks with multi-PLP

Signal monitoring has proven to be an effective technique when it comes to identifying and correcting quality problems in television signals broadcast across the territory. For a DVB-T2 signal that uses multiple ‘pipes’ at the physical level (multi-PLP), a separate receiver is required to analyze each PLP.

The R & S®DVMS digital TV monitoring systems are extremely flexible and can be configured to meet multiple customer needs – from sequential PLP monitoring systems with a single receiver to systems that provide seamless multi-PLP parallel analysis .Activities to be performed

Network operators appreciate the high channel capacity and flexible configuration of transmission parameters offered by the DVB-T2 standard. The use of multiple ‘conduits’ (PLP) in the physical signal layer allows you to carry multiple services in a single channel. Each PLP can have different modulation and error protection parameters.

This makes it possible, for example, to transmit HD services with 64QAM modulation for reception over roofs in PLP1 together with services transmitted with QPSK modulation for mobile reception in PLP2 on a single transmission frequency. For optimal utilization of available channel capacity, the standard allows dynamic allocation of data to individual PLPs during operation to accommodate changes in data rate requirements.

The complex nature of DVB-T2 signals with multi-PLP conceals an increased potential for error – from the generation of the non-standard T2-MI signal in the gateway to problems in the modulator.

For this reason, DVB-T2 signals are automatically monitored in the test phase and, subsequently, in the operational DVB-T2 network. By analyzing each PLP of a broadcast signal, operators can immediately respond to quality problems and failures, and quickly restore the expected performance and coverage area of ​​their networks.
Measurement solution

The extremely compact R & S®DVMS monitoring systems for digital TV ensure high-quality and cost-effective monitoring of DVB-T2 signals with multi-PLP, at the RF level (MER, BER, etc.) and at the transport stream level, in according to ETSI TR 101 290. An option allows operators to simultaneously monitor T2-MI signal feeds.

Any detected faults can be automatically notified, in real time, to a network management system via SNMP protocol. PLP monitoring can be done directly at the transmission site and at representative reception sites to account for possible sources of interference, such as adjacent mobile radio channels. Alternatively, PLP monitoring can be performed at the transmitting site or at the most representative receiving sites.

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