Signal and Noise

1
Signal and Noise
2
Combined Signal and Noise
V1
V2
V3
SNR 1
3
Binary Decision Table
4
Binary Decision Table
5
Probability Density Function - Noise
Normal or Gaussian Distribution
mN
6
PDF Signal and Noise
mSN
7
Detectivity (Detection) Index
Processed SNR
8
Example ROC Curve
9
Receiver Operating Curves
d40
d10
d0
d 40
10
ROC Curves
Chance diagonal
P(D) 50 P(D) 0.2 d ?
11
Nyquist Theorem

• The sampling rate must be at least twice the
  bandwidth, Df, of the received power so that no
  signal information is lost.

12
Correlation Process
Signal or signal plus noise
Display
Compare
Threshold, Vo
Replica of signal
13
Correlation Detector (active)
14
Square Law (Energy Detector) Process
Signal or signal plus noise
Display
Compare
Threshold, Vo
Signal or signal plus noise
15
Energy Detector (passive)