ebtono.m

来自「Electronic Communication Systems的Matlab源」· M 代码 · 共 61 行

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% Energy per bit to noise density ratio assuming a noise temperature of 350K.
% The user enters the transmitted and received powers, frequency, bit rate 
% and minimum and maximum antenna spacing
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f=input('Enter the Transmitter carrier frequency in Megahertz  ');
bit_rate=input('Enter the system bit rate in bits/sec  ');
Pt=input('Enter the transmitter power in watts  ');
Gt=input('Enter the transmitter antenna gain in dBi  ');
Gr=input('Enter the receiver antenna gain in dBi  ');
dmin=input('Enter the minimum distance between receiver and transmitter in km  ');
dmax=input('Enter the maximum distance between receiver and transmitter in km  ');


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% obtain distance vector
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dstep=(dmax-dmin)/100;
d=dmin:dstep:dmax;


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% Compute the overall loss in dB
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loss =(Gt + Gr - (32.44+20*log10(d)+20*log10(f)));

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% Compute the received power
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Pr = Pt*(10.^(loss/10));

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% Compute energy bit rate to noise density ratio
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Eb = Pr/bit_rate;

k = 1.38e-23;
T = 350;
N = k*T;

result = 10*log10(Eb/N);

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% Plot energy per bit to noise ratio over the antenna spacing range
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clf
figure(1)

plot(d,result);
title('Energy per bit to noise density ratio in dB for a range of antenna spacing')
ylabel('dB')
xlabel('transmitter receiver spacing in km')
grid
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