In [1]:

```
import math
#Variable declaration
Pdiff=-3.; #in dB
AMR1=12.2; #in kbps
AMR2=7.95; #in kbps
AMR3=4.75; #in kbps
#Calculations
#CG(dB)=10math.log{(DPDCH(kbps)+DPCCH)/(DPDCH(AMR bit rate (kbps))+ DPCCH)}
CG1=10*math.log10((AMR1+AMR1*10**(Pdiff/10))/(AMR2+AMR1*10**(Pdiff/10)));
CG2=10*math.log10((AMR1+AMR1*10**(Pdiff/10))/(AMR3+AMR1*10**(Pdiff/10)));
#Results
print 'By reducing the AMR bit rate from 12.2 to 7.95 kbps coverage gain becomes %.2f dB'%CG1;
print 'By reducing the AMR bit rate from 7.95 to 4.75 kbps coverage gain becomes %.2f dB'%CG2;
```

In [2]:

```
import numpy as np
import sympy
from sympy import symbols
#Variable declaration
K=4; #constraint length
r=1./2; #code rate(n/k)
x=symbols('x');#Defining x as a ploynomial variable
G1=1+x**2+x**3;
G2=1+x+x**2+x**3;
ins=np.array([1, 0, 1, 1, 1]);#input(first bit first)
#Calculations&Results
#with reference to Fig 8.9 on page no 239
g1=np.array([1, 0, 1, 1]); #converting from G1 polynomial to bit form
g2=[1, 1, 1, 1];##converting from G2 polynomial to bit form
x1=np.convolve(g1,ins)
x2=np.convolve(g2,ins)
V1=x1%2;
V2=x2%2;
print "Multiplexing the V1 and V2 to get required output sequence as"
a=5;
for i in range(0,6):
print '%d%d'%(V2[a],V1[a]);
a=a-1;
```

In [3]:

```
import numpy as np
#Variable declaration
BitStream=np.array([0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 1]);#Last bit to first bit
# Interleaver
Input1=[[1, 0, 0, 0],[1,0,0,0],[1,1,1,0],[0,0,0,0]] #Writing data row wise
#Calculations&Results
print "GIven Bit stream is",BitStream
print "Input to interleaver is",Input1
Output1=np.array([0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1]); # Reading data column wise
print "Output of interleaver is",Output1
#De-interleaver
Input2=[[1, 1, 1, 0],[0,0,1,0],[0,0,1,0],[0,0,0,0]] #Writing o/p data row wise
# Let From 6th to 9th bits have Burst Error
print "Input to de-interleaver is",Input2
#Output of deinterleaver
Output2= [0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 1];
print "Output of de-interleaver is",Output2
print "Bits with Burst error were from 6th to 9th. But in output of de-interleaver, they relocated to positions 3rd, 6th, 10th and 14th.";
```