NEW DIGITAL SIGNAL-PROCESSING APPROACH FOR TRANSMITTER MEASUREMENTS IN DVB-C SYSTEMS |
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| Leopoldo Angrisani, Aldo Baccigalupi, Massimo D’Apuzzo, Mauro D’Arco |
- Abstract:
- An innovative digital signal-processing method, aimed at testing and troubleshooting QAM (Quadrature Amplitude Modulation) transmitters used in DVB-C (Digital Video Broadcasting-Cable) systems, is presented and validated. It takes advantage of a suitable clustering procedure, which is capable of recognizing the distorted pattern of symbols, produced by the transmitter under test, even when different impairments disturb, at the same time, the standard functioning of the transmitter itself. Right identification of the impairments along with accurate evaluation of their amount is then achieved through the application of original and straightforward measurement algorithms to the aforementioned pattern, properly corrected. The results of a number of experiments, conducted on emulated QAM signals, show the superior effectiveness and reliability of the proposed method with respect to those assured by the measurement techniques suggested by ETSI (European Telecommunications Standard Institute).
- Keywords:
- Transmitter measurements, Troubleshooting, I/Q impairments, QAM, Clustering
- Download:
- IMEKO-TC4-2002-139.pdf
- DOI:
- -