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Waveforms

Waveforms. Waveform Properties. Select from: Blackman envelope, Chirp, Gaussian, Gaussian derivative, Hamming envelope, Hanning envelope, Raised cosine, Root raised cosine, Sinusoid, Tukey envelope, User-defined waveform

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Waveforms

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  1. Waveforms

  2. Waveform Properties • Select from: • Blackman envelope, Chirp, Gaussian, Gaussian derivative, Hamming envelope, Hanning envelope, Raised cosine, Root raised cosine, Sinusoid, Tukey envelope, User-defined waveform • Carrier frequency: Used to determine the reflection, transmission, and diffraction coefficients of materials • Pulse width / bandwidth: Defines width of pulse in the time- or frequency-domain • If the dispersive option is engaged, calculation of E-field as a function of time will include the dispersion on the waveform pulse as it propagates

  3. Waveform Properties (2)

  4. Default Waveform: Sinusoid • Defined by carrier frequency, effective bandwidth, and phase offset • The effective bandwidth, B, is used to calculate the carrier-to-interferer ratio when transmitted waveforms overlap

  5. Sinusoid Waveform

  6. Other Waveform Types • Generic pulse shapes: • Gaussian, Gaussian derivative • DSP filter shapes: • Blackman envelope, Hamming envelope, Hanning envelope, Tukey envelope • Digital communications pulse shapes: • Raised cosine, Root raised cosine

  7. User-Defined Waveform • Specify time-domain or frequency-domain samples of a waveform by referencing an external file • Time-domain samples must be real and causal; frequency-domain samples are typically complex pass-band values

  8. User-Defined Waveform (2)

  9. Effect of Waveforms on Calculations • Frequency-dependent materials consider the carrier frequency of rays that interact with it • Carrier-to-interferer ratio is computed based on the spectral overlap of collected rays whose waveforms are not orthogonal • E-field versus time and power delay profile (PR vs. time) is computed with the effects of dispersion, if enabled

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