A DIGITAL SIGNAL PROCESSING METHOD FOR THE DETECTION AND EVALUATION OF I/Q IMPAIRMENTS IN RF DIGITAL TRANSMITTERS |
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| Leopoldo Angrisani, Raffaele Colella |
- Abstract:
- Troubleshooting of radiofrequency (RF) digital transmitters is here dealt with. Specifically, a new digital signal-processing method is developed, which is capable of both detecting and evaluating the most recurrent impairments in the I and Q paths of the transmitter. Only the acquisition either of intermediate frequency (IF) or RF output signal is needed, thus avoiding any difficulty connected with the inaccessibility of baseband and/or IF section in a fully assembled transmitter. Moreover, the method has the required features of automation and effectiveness, granted by the use of RLS-based algorithms and proved by the results obtained in many experiments on actual IF and RF output signals. Even though the experiments presented in the paper refer to W-CDMA (Wideband Code Division Multiple Access) technology, the method shows itself suitable to troubleshoot any digital transmitter implementing quadrature amplitudemodulation (QAM).
- Download:
- IMEKO-TC4-2002-178.pdf
- DOI:
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