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Virtual Field Test
Virtual Field Testing is a way of replicating field conditions in a lab environment within very short timescales. Digital TV Labs has a large library of benchmarked DVB-T, DVB-H and analogue TV RF recordings that can faithfully reproduce real RF field conditions in a lab environment
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The Virtual Field Testing cover:
♦ DVB-T, DVB-C, DVB-T2, ISDB-T, DVB-H and Analog Recordings
♦ Repeatable lab test
♦ Covers Europe’s RF Black-Spots
♦ Benchmarked and reference receiver comparison
♦ Client hosting for receiver optimization activity
♦ Mobile DVB-T testing
One of the most important features of a terrestrial receiver is the performance of the RF front-end, principally consisting of a tuner and a demodulator. Conventional field testing can take several weeks to cover Europe’s key markets and the resulting issues are often difficult to reproduce in a lab environment. In Virtual Field testing, RF performance is tested by replaying RF captures of the actual channels which include accurately reproduced impairments. Digital TV Labs can deliver - on demand - accurate reproducible simulated field testing in our lab, enabling field tests to be completed in a fraction of the time of a conventional field test.
RF Testing For Europe's Trouble Spots
Conventional RF lab testing to specifications such as MBRAI, D-Book and NorDig, can never accurately replicate the real field conditions that receivers will actually encounter. These specifications usually test only one type of signal impairment, such as an echo or interference, at any one time. Real field conditions are often a combination of multiple impairments, such as fading, impulse noise and echoes. The wide variation of complex waveforms that are actually encountered in the field cannot possibly be modeled with standard lab tests.
Digital TV Labs Virtual RF Test Suite
Digital TV Labs has built up a library of thousands of DVB-T, DVB-C, ISDB-T, DVB-H and analogue TV RF recordings and continuously adds in excess of 100 recordings per month. Our onsite, geographical knowledge of testing at over 350 sites across Europe allows us to make recordings of challenging conditions at numerous predetermined European trouble spots where our engineers have experienced and documented receiver failures in the past. We maintain a comprehensive record of information on the RF environment at the site, including comparison performance of a standard reference receiver. The Digital TV Labs Virtual RF Test Suite is a selected library of the most challenging RF captures from across Europe that enables field validation of TV front-ends in a repeatable and controlled environment.
Benchmarking RF Performance with the Virtual RF Test Suite
Virtual RF Field Testing can be performed by city or by selecting recordings with a particular interesting impairment. For DVB-T and DVB-H channels, using in-line attenuators the QEF or equivalent level is recorded and compared against the specification, a reference receiver and the benchmarked average performance of other receivers tested. For analogue TV, we use specialised test equipment and a reference receiver. All tests are fully repeatable at our Bristol Test Centre, enabling clients of Digital TV Labs to make improvements to systems and to re-run exactly the same tests. Clients can purchase the Virtual RF Test Suite for replication of issues in their own development labs, or Digital TV Labs can host engineers for on-site debugging and optimization.
Reporting and Issue Rectification
We understand the importance of quality reports and support services, to enable clients to fully understand the issues we find, to prioritize them and to quickly rectify them thereby reducing time-to-market. The culmination of the Virtual RF test is a detailed report containing comprehensive information on the receiver performance, reference receiver performance and the key parameters of the RF recording. Information is also provided on the modulation parameters of the channel under test, adjacent interferers, power levels and echo characteristics. In addition to the measurements, a report is delivered describing in detail the test performance criteria, how they were performed, graphs of correlated data, comments on performance and conclusions.
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