lecture16

lecture16 - EE455/591 C r Am arrie plitudeModulation Re...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
EE455/591 Carrier Amplitude Modulation Reading: Read Section 7.4 Review: Geometric Representation of Signals Topics: 1. 1. Binary Phase Shift Keying (BPSK) 2. 2. Quaternary Phase Shift Keying (QPSK) 3. 3. Quadrature Amplitude Modulation (QAM) & MPSK 4. 4. Error Probability of MPSK and QAM
Background image of page 1

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

View Full DocumentRight Arrow Icon
Review: Antipodal and Orthogonal Signals Basis: 2-PPM Antipodal sine and cosine ψ 1 (t) ψ 2 (t) Signals: s 1 (t) (E s /T) Ψ 1 (t) s Ψ 1 (t) s Ψ 1 (t) s 2 (t) s Ψ 2 - s Ψ 1 (t) s Ψ 2 (t) Signal space: Error Probability: T 1/ T t T t T t T t T A t (2/T) No Ψ 2 (t) Ψ 1 Ψ 2 s 1 s 2 E s E s Ψ 1 Ψ 2 s 1 s 2 E s E s Ψ 1 s 1 E s s 2 - E s 0 0 0 2 N E Q N E Q N E Q s s s
Background image of page 2
Review: Antipodal and Orthogonal Signals Basis: 2-PPM Antipodal cosine and sine ψ 1 (t) ψ 2 (t) Signals: s 1 (t) (E s /T) Ψ 1 (t) s Ψ 1 (t) s Ψ 1 (t) s 2 (t) s Ψ 2 - s Ψ 1 (t) s Ψ 2 (t) Signal space: Error Probability: T 1/ T t T t T t t t (2/T) No Ψ 2 (t) Ψ 1 Ψ 2 s 1 s 2 E s E s Ψ 1 Ψ 2 s 1 s 2 E s E s Ψ 1 s 1 E s s 2 - E s T c <<T T c 0 0 0 0 2 N E Q N E Q N E Q s s s
Background image of page 3

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

View Full DocumentRight Arrow Icon
1. Carrier Amplitude Modulation Pulse Code Modulation for baseband communications For wireless or co-axial cables, wave propagation requires: A carrier with carrier frequency f c We can use PCM to modulate the carrier Can multiplex different frequency channels with different f c Information can be carried, just like we have learned in first half of course for analog modulation, through: AM: Changing the amplitude of the carrier A in y(t)=Acos(2 π f c t+ Θ ) FM: Changing the frequency of the carrier f c in y(t)=Acos(2 π f c Θ ) PM: Changing the phase of the carrier Θ π f c Θ )
Background image of page 4
Antipodal signaling + cos modulation = BPSK (in-phase) Data a i Filter h(t) cos(2 π f c t)
Background image of page 5

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

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/01/2009 for the course EEE 455 taught by Professor Hui during the Spring '09 term at ASU.

Page1 / 18

lecture16 - EE455/591 C r Am arrie plitudeModulation Re...

This preview shows document pages 1 - 6. Sign up to view the full document.

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