Complex Baseband Representation of Real-valued Bandpass Signals and Systems
3{1
Lecture 3
Complex Baseband Representation of
Real-valued Bandpass Signals and
Systems
ECE 645
Professor Joon Ho Cho
Handout #3
Sept. 10, 2001
Why real-valued bandpass signals and systems?
Review of signals and systems
Complex baseband representation of real-valued
bandpass signal
{ analytic signal = pre-envelope
{ complex envelope
{ narrowband bandpass signal
{ I-Q demodulator
{ I-Q modulator
Complex baseband representation of real-valued
bandpass LTI system
{ relations among input complex envelope, output
complex envelope, and complex envelope of
impulse response