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Impairments affecting the baseband modulator of digital transmitters, which are commonly called I/Q impairments, are responsible for the deviations of symbols from their original position on the I/Q diagram. They cause a reduction in the noise margin and ultimately worsen the probability of error. This is why their measurement is so important in all stages in the life cycle of digital transmitters...
Impairments affecting the baseband modulator of digital transmitters, commonly named I/Q impairments, are responsible for deviations of symbols on the I/Q plane from their original position. They consequently cause a reduction of noise margin and can ultimately increase the probability of error. This is the reason why their evaluation is so important in troubleshooting and testing activities. The...
The paper describes the hardware architecture and software strategies of two prototypes of ultrasonic-based distance meter. Prototypes are based on a digital signal controller (DSC), mandated to supervise its whole functioning. Besides driving the piezoelectric transducer, the DSC manages the digitization of received ultrasonic signal, processes acquired samples according to two different measurement...
The paper deals with distance or level measurements based on ultrasonic time-of-fight estimation. Starting from a past experience concerning the use of the discrete extended Kalman filter (DEKF) to overcome some limitations affecting already available ultrasonic-based techniques, the authors are going to present a new digital signal-processing method capable of improving the cited advantages. The...
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