S. Mandayam/ ECOMMS/ECE Dept./Rowan University Electrical Communications Systems ECE.09.433 Spring 2019 Lecture 4a February 12, 2019 Shreekanth Mandayam ECE Department Rowan University http://engineering.rowan.edu/~shreek/spring19/ecomms/ S. Mandayam/ ECOMMS/ECE Dept./Rowan University Plan DSB-SC Modulation Signals Systems Time Domain Complex Envelope Spectrum Power Performance Transmitters Receivers Standards
Costas Loop QAM Complex Envelope Representation Spectrum of a bandpass signal Modulation Index Efficiency Bandwidth Noise S. Mandayam/ ECOMMS/ECE Dept./Rowan University ECOMMS: Topics E le c tr ic a l C o m m u n ic a tio n S y s te m s S ig n a ls D is c r e te S y s te m s C o n tin u o u s A n a lo g P r o b a b ility P o w e r & E n e r g y S ig n a ls AM
S w itc h in g M o d u la to r E n v e lo p D e te c to r In fo r m a tio n C o n tin u o u s F o u rie r T r a n s fo rm D S B -S C P r o d u c t M o d u la to r C o h e re n t D e te c to r C o s ta s L o o p E n tro p y D is c r e te F o u rie r T r a n s fo rm SSB W e a v e r 's M e th o d P h a s in g M e th o d F re q u e n c y M e th o d C h a n n e l C a p a c ity B a s e b a n d a n d B a n d p a s s S i g n a ls F r e q u e n c y & P h a s e M o d u la tio n N a rr o w b a n d /W id e b a n d V C O & S lo p e D e te c to r PLL D ig ita l D ig ita l C o m m T r a n s c e iv e r
B aseband CO DEC B andpass M O DEM S o u r c e E n c o d in g H u ffm a n c o d e s ASK PSK FSK E r r o r-c o n tro l E n c o d in g H a m m in g C o d e s BPSK S a m p lin g PAM Q PSK Q u a n tiz a tio n PCM M -a ry P S K L in e E n c o d in g Q AM
C o m p le x E n v e lo p e G a u s s ia n N o is e & S N R T im e D iv is io n M u x T 1 (D S 1 ) S ta n d a rd s R a n d o m V a r ia b le s N o is e C a lc u la tio n s P a c k e t S w itc h in g E th e rn e t IS O 7 -L a y e r P ro to c o l S. Mandayam/ ECOMMS/ECE Dept./Rowan University DSB-SC Modulation Signals Systems Performance Transmitters Receivers Time Domain Complex Envelope Spectrum Power Message Spectrum |M(f)|
-B DSB-SC Spectrum Standards 0 +B Matlab Demo f |S(f)| -fc-B -fc -fc+B 0 Modulation Index Efficiency Bandwidth Noise fc-B fc fc+B http:// engineering.rowan.edu/ ~shreek/spring11/ecomms/ demos/dsbsc.m f S. Mandayam/ ECOMMS/ECE Dept./Rowan University
DSB-SC: Balanced Modulator Accos2fct m(t) AM -m(t) -Accos2fct AM S. Mandayam/ ECOMMS/ECE Dept./Rowan University DSB-SC: Coherent Detector s(t) Product Modulator v(t) Aocos2fct Local Oscillator Baseband LPF ~ (t)
m S. Mandayam/ ECOMMS/ECE Dept./Rowan University Synchronous Coherent Detection: Costas PLL I-Channel Product Modulator Baseband LPF VCO s(t) v4(t) v1(t) v3(t) LPF -90o Phase Shift Product Modulator ~ (t) m
X Phase Discriminator Baseband LPF Q-Channel v2(t) S. Mandayam/ ECOMMS/ECE Dept./Rowan University Quadrature Amplitude Modulation (QAM) Tx m1(t) Rx I-Channel Product Modulator s(t) Product Modulator Local
Oscillator m2(t) LPF ~ (t) m 1 Local Oscillator -90o Phase Shift -90o Phase Shift Product Modulator Product Modulator Q-Channel LPF ~ (t) m 2
S. Mandayam/ ECOMMS/ECE Dept./Rowan University Complex Envelope Representation message: m(t) carrier: c(t) Modulator s(t): radio signal We want a common mathematical representation for information transfer from baseband to bandpass any bandpass signal any time of modulation signal/noise and signal+noise S. Mandayam/ ECOMMS/ECE Dept./Rowan University Spectrum of a Bandpass Signal S. Mandayam/ ECOMMS/ECE Dept./Rowan University Summary
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