ANNA UNIVERSITY IT THIRD YEAR DIGITAL LAB MANUAL REGULATION 2013
digtal communication
digital communication
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This material covers all aspects of Spread Spectrum Modulation like dsss and fhss for VTU students. This material also covers have question bank of questions appearing in VTU examFull description
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Telecommunication knowledge about transmission
unit 2
unit 2
Digital and Analog Communication Systems
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it is a good book for a&d communicationDescription complète
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DIGITAL COMMUNICATION FORMULAS r 1 H R
Pulse Code Modulation (PCM) Number of Levels and Scale Factor ; SF
2n M
Rate of Information H R T T t1P1 t 2P2 t3P3 ...
1 M
Bandwidth and Data rate
BWPCM fb nf nfS
Information Capacity
Dynamic Range V DR max V min DR 2n 1 DRdB 20logDR
Shannon-Hartley Theorem
I 2B log2 M
Hartley’s Theorem
Line Code Parameters Code Type Bandwidth NRZ f
Resolution or Quantization Step V resolution max 2n
b
2
Maximum Quantization Error resolution Qe max 2
RZ
f b
Manchester
f b
AMI
f b 2
Coding Efficiency
S I B log2 1 N H
Frequency Shift Keying B 2 fb f
Bmin Bmax
fm fs f Aliasing falias N f Nfs f folding
nf b 2
MSK
Phase Shift Keying and Quadrature Amplitude Modulation System Bitrate/Baudrate ratio Binary 1 Quadrature 2 83 16 4 32 5
f s 2
Signal to Quantzation Noise Ratio 6. 6.02n 1.76 1.76 SQNRideal sin SQNR peak 6.02n 4.76 SQNRaveragetri 6.02n
Probability of Error
uLaw Companding
Pe erfc
V in ln 1 V max Vout V max ln 1
v out
N o
Pe 0.5e Pe erfc
A-law Companding
v in A V v max max 1 ln A v in 1 ln A v max V max 1 ln A
2E b
Pe erfc if
if
0
1 A
v in Vmax
v in V max
E b N o
S 2N
S N
Coherent Systems / Matched Filter
Noncoherent Systems
On-Off Binary Polar Binary
1 A
1
Information Measure 1 Ii logb logb P i P i
Hamming Distance ( m + n , m ) Hamming distance for correction HdD e 1
HdC 2e 1
Hamming distance for detection
2 m n1
Relationship between data and correction
n
Bit Error Rate error BER total E E b 1 1 N t dt 1 erfc N 2 e 2 o E N b o
Average Information / Entropy H P1I1 P2I2 P3I3 ...
BERQPSK
2
b
o
Hmax logb N Relative Entropy H H R H max Redundancy electronreview.wordpress.com – Leslie Caminade