Synchronization techniques in DSBSC system

Answer 1

Case 1 -Frequency error

Multiplier

Multiplier

Low passfilter

Low passfilter Message signal

DSB-S

C

Local oscillator

c

(

t

)=

E

c

cos(

[

c

t+

([

)

Local oscillator

c

(

t

)=

E

c

cos(

[

c

t+

([

)

Condition:



Local oscillator has the same

phase

but

different

frequency

compared to carrier signal at thetransmitter.

[

m

2

[

c

+

[

m

2

[

c

-

[

m

Low pass filter

high frequencyinformation

)(cos]cos)([)(

[([[

t t t mt

y

cc

)2(cos)(cos)()(cos)()2(cos)()(

21212121

[(



[



[(

!

[(





[(



[

!

t t t t t t t

y

cc

[(

!

cos)()(

21

t t v