Calculate the RMS Value of signal, Iam getting an error:

%Generate bit sequence

bit_seq=[1 0 0 1 1 0 1 1];

%Consider bit period. This also defines the bit frequency/data rate

%Data rate=1MHz

bit_period=0.000001;

%There are 8 bits in the sequence. The period for each bit is 0.000001

%Hence the time scale will be in the range of 0 to 8*10^-6 for 8 bits

t1=bit_period/1000:(bit_period/1000)*1:1000*length(bit_seq)*(bit_period/1000);

bit=[];

for n=1:1:length(bit_seq)

if bit_seq(n)==1;

se=ones(1,1000);

else bit_seq(n)==0;

se=zeros(1,1000);;

end

bit=[bit se];

end

subplot(3,1,1)

plot(t1,bit,'g','linewidth',1)

xlabel('Time')

ylabel('Amplitude')

title('Bit Sequence')

t2=0:0.001:1-(0.001);

sigma=.1;

mean=0.5;

b=2*(sigma)^2;

g=exp((-(t2-mean).^2)/b);

%Generation of gaussian signal for the bits

bit1=[];

for n=1:1:length(bit_seq)

if bit_seq(n)==1;

se=exp((-(t2-mean).^2)/b);

else bit_seq(n)==0;

se=0*exp((-(t2-mean).^2)/b);

end

bit1=[bit1 se];

end

subplot(3,1,2)

plot(t1,bit1,'r','linewidth',1)

xlabel('Time')

ylabel('Amplitude')

title('Gaussian signal')

%Finding the RMS Value of the gaussian signal

RMS1=sqrt(mean(bit1.^2));

disp(RMS1)

Iam getting an error:

Array indices must be positive integers or logical values.

Error in ask_gaussian_rms (line 53)

RMS1=sqrt(mean(bit1.^2));

>>

Answer 1

[Eric]

You are trying to use the MATLAB function mean(), but you have a variable of the same name, which it why it thinks bit1.^2 is an index rather than an input argument for the mean() function. Try to avoid using variable names that are also MATLAB function names (e.g. use mymean instead).

[Mrinmoyee Mukherjee]

Thanks Eric