why should be the range of r should be the same range of d?

Question

Shahd Altalhi 2020-4-19

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编辑： Sahithi Kanumarlapudi 2020-4-23

HI, I have an error on matlab i want the range of r like this and the range of d like this ?

but matlab say should be the same , can you help me?

clc;

close all;

%common parameters

R=0:1:30; %assume reference distance = 1m

f=6; %Frequency band [GHz]

n=5; %Noise figure [dBm]

I_r=1; %Interference margin loss [dB]

L=0.1; %Connector loss [dB]

gt=6; %Transmitter Antenna Gain [dBi]

gr=2; %Receiver Antenna Gain [dBi]

pt=33; %transmitter power[dBm]

B=20; %Bandwidth [MHz]

d=0:10:500; %The range of the distance between TX and RX

% Free Space Propagation Model

PL = 33.44 + 20*log(f) + 20*log(R); %Path Loss Equation

disp(PL);

Rss=pt+gt+gr-PL-L;

disp(Rss);

SNIR=Rss/(n+I_r);

disp(SNIR);

Throughput=B.*log2(1+(10.^(SNIR/10)));

disp(Throughput);

hold on;

figure (1)

subplot(2,2,1)

plot(d,PL,'LineWidth',1.5)

title('Free Space Model');

xlabel(' distance (m)');

ylabel('Path loss(dB)');

subplot(2,2,2)

plot(d,Rss,'LineWidth',1.5)

title('Free Space Model');

xlabel(' distance (m)');

ylabel('RSS');

subplot(2,2,3);

plot(d,SNIR,'LineWidth',1.5)

title('Free Space Model');

xlabel(' distance (m)');

ylabel('SNIR');

subplot(2,2,4);

plot(d,Throughput,'LineWidth',1.5)

title('Free Space Model');

xlabel(' distance (m)');

ylabel('Throughput');

hold off;

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Sahithi Kanumarlapudi 2020-4-22

编辑：Sahithi Kanumarlapudi 2020-4-23

Could you elaborate more on what do you mean by "this"?

abdulmajeed jasim 2020-4-22

Make the range of R "R=0:1:50; %assume reference distance = 1m"

to be the same your vactor d "d=0:10:500; %The range of the distance between TX and RX"

your code will be run.

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Answer 1

Deepak Gupta 2020-4-22

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Hello Shahd,

I run your code and see error "Vectors must be the same length" because of line plot(d,PL,'LineWidth',1.5).

In your code, you have defined distance using 2 variables 'R' and 'd'. You should define only one variable for distance.

Later you are using vector R to calculate path loss so path loss vector will be of same size as vector R. which in your case is 1-by-31.

And then you are trying to plot the pathloss PL against distance vector d, which is of different size. You can't use plot with two vectors of different sizes.

I assume that you want to plot your path loss against distance. Then you should plot PL vs R because thats the distance you have used to calculate your pathloss.

I see no significance of vector d in your code.

Thanks,

Deepak