ch3.5apm_handout

ch3.5apm_handout - 1 1 EEN 404 EEN 404 Communication...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 1 EEN 404 EEN 404 Communication Systems Communication Systems Ch3.5: Analog Pulse Modulation Ch3.5: Analog Pulse Modulation 2 Ch2.8 Sampling Theory Ch2.8 Sampling Theory Sampling theorem: If a signal x(t) satisfies then the signal is completely described by instantaneous sample values with sampling frequency 2W: Nyquist frequency Sampled signal: Reconstruction: from samples to recover the signal x(t) The signal x(t) can be exactly reconstructed from the sampled signal by passing it through an ideal lowpass filter with bandwidth B where W<B<f s-W and f s =1/T s 3 FT: 3 lowpass filtering for reconstruction Spectrum of sampled signal Sampled signal: Eq. (2.136): reconstruction f s > 2W no overlap between spectra W<B<fs-W recover x(t) without distortion B 2 4 Aliasing if f s < 2W Non-ideal lowpass filter Possible distortion 5 Sampling bandpass signals: if a bandpass signal x(t) satisfies then the signal can be recovered by sampling at integer floor...
View Full Document

Page1 / 4

ch3.5apm_handout - 1 1 EEN 404 EEN 404 Communication...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online