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Digital communication

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... process in the phase discriminator is based on the noisy inputs ... Using erfc function. Using Q function. Bandwidth calculation. 1 ASK BW=2rb. 2 PSK BW=2rb ... – PowerPoint PPT presentation

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Title: Digital communication


1
Digital communication
H V KUMARASWAMY
2
Topics in this session
M-ary Modulation Technique M-ary PSK and
FSK Problems Bandwidth calculation
3
M - ary PSK
Orthogonal Functions
4
Signal Constellation for octaphase shift -
keying
M8
5
The decision making process in the phase
discriminator is based on the noisy inputs

Receiver for Coherent M-ary PSK
6
M - ary QAM
7
Block Diagram of M ary QAM System - Transmitter

8
Block Diagram of M ary QAM System - Receiver
9
Signalling Constellation M16
M-ary QPSK
M-ary QAM
10
M-ary FSK
Serial to Parallel
D / A
VCO
Binary Data
M-ary FSK
11

12
(No Transcript)
13
Problems
A bandpass data transmission scheme uses a PSK
signalling scheme with
The Carrier Amplitude at the receiver input is
1mV and the PSD of the Additive white gaussian
Noise at the input is 10-11 Watts/Hz. Assume
that an ideal correlation receiver is used.
Calculate average bit error rate of the receiver.
14
Using erfc function
15
Using Q function
16
(No Transcript)
17
Bandwidth calculation
1 ASK BW2rb 2 PSK BW2rb 3 FSK BWgt2rb
18
Conclusion
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