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# abdullah qasim

##### Last seen: 25 días ago
32 total contributions since 2018

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can you explain someone, how to create a channel matrix for visible light communication
clear clc theta=70; % semi-angle at half power m=-log10(2)/log10(cosd(theta)); %Lambertian order of emission P_total=2000;...

3 meses ago | 0

How can established LOS-link for Indoor visible light communications using only one LED source?
clear clc theta=70; % semi-angle at half power m=-log10(2)/log10(cosd(theta)); %Lambertian order of emission P_total=2000;...

3 meses ago | 0

cognitive based visible light communication
this code for one LED clear clc theta=70; % semi-angle at half power m=-log10(2)/log10(cosd(theta)); %Lambertian order of ...

3 meses ago | 0

Question

how save results?
how save sevral results in same time like this in one term save(z_room z_room1 z_room2 z_room3 z_room4 z_room5 z_room6 z_room...

3 meses ago | 1 answer | 0

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Question

surface fixed point value Z
Dear I want to know the value of Z from the surfc function That is when I give the value of x, y It gives me the value of z ...

3 meses ago | 2 answers | 0

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Question

How to find the amount of the average power at a given point?
How to find the amount of power rate at a given point For example [0.5 1.4] [1.2 3] [1.8 7] In a room of dimensions of leng...

3 meses ago | 0 answers | 0

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Question

how flip the signal as below?
X=[1 2 -5 4 -7 8 9 -4 -5 6 1 -2 3 -6 ] I want to program the following using "if" If the value of Xp is higher than "0", pass...

5 meses ago | 1 answer | 0

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Question

flip negative value as shown bellow
if x=[1 2 -5 7 -9 4 -6 7 -6 8 -5 2 -1 5 -6 -8 -9 7 4 -1 ] x + = if x(k) ≥ 0 0 otherwise x-= if x(k) < 0 ...

5 meses ago | 1 answer | 0

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Question

how to apply hermitian symmetry on the complex value
how apply hermitian smmetry on the complex value to get real value like a+bi While keeping the length of fft constant

6 meses ago | 1 answer | 0

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Question

how remove the effect of hermitian symmetric ???
To remove the imaginary signal a hermitian symmetry is placed with the ifft as shown below Xsym = ifft(Y,'symmetric') My quest...

6 meses ago | 1 answer | 0

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Question

I want to reshape the original vectors?
hi every one If I have the following vectors x= [1 2 -6 9 -7 8 -8 -5 2 4 -6 4 -4 -5 -7 6 10 2 3 7 -8 9 -8 -5 4 -6] Xp=x(x>0...

12 meses ago | 0 answers | 0

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Question

how reshape the separated signal to original signal ?
hi every one If I have the following vectors x= [1 2 -6 9 -7 8 -8 -5 2 4 -6 4 -4 -5 -7 6 10 2 3 7 -8 9 -8 -5 4 -6] Xp=x(x>0...

12 meses ago | 1 answer | 0

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how separate the first one (Xp) from (Xn).?
thank u very much All the appreciation to you thank you very much

12 meses ago | 0

Question

how separate the first one (Xp) from (Xn).?
now when I compleat the first signal, But now I want to separate Xn from Xp in the following rs=[Xn, Xp] but the length of Xn...

12 meses ago | 2 answers | 0

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Question

plot or stem the length of negative and positive signal?
I follow positive and negative references XNsize = length (Xn); [XNsize, Xn, Xp] I want to plot the signal by using "stem" as...

12 meses ago | 2 answers | 0

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Question

polarity signal transmitter separated ?
I want to separate the negative signal from the positive signal? x=41 ; %number of pn ...

alrededor de 1 año ago | 0 answers | 0

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Question

vectore with two colors
I merged two parts together and I want to draw them together but in two different colors fb=[fr;fi]; when stem (fb) ; the o...

alrededor de 1 año ago | 1 answer | 0

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Question

Polarity different dimension summation
I have bipolar signal as positive and negative as shown in the following x=[-1 8 2 -3 -5 6 -4 5 -8 7 -9 4 5 -10 -6 -11 8 3 7 ...

alrededor de 1 año ago | 1 answer | 0

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Question

odd transmitter number from the signal
if x=[1 -5 4 -6 7 -3 -7 5 6 3 7 8 -4 -1 ] I want pass the odd number of this signal and set the even number to zero

alrededor de 1 año ago | 1 answer | 0

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Error in FBMC vs. OFDM Modulation of Mathworks
this code calculates BER for one sample, not for all samples so give one value for BER. so we must do it loop (for loop) to cal...

alrededor de 1 año ago | 0

Question

sum first matrix and second matrix
I want to collect the first function and the second function but there is an error there is no help ('Xf '). x=[-1 8 2 -3 -5...

alrededor de 1 año ago | 1 answer | 0

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Question

Separate the positive values from the negative values
I have the following X=[1 - 3 5 -8 4 9 -6 -3] I want to separate the polarity ( positive values from the negative value...

alrededor de 1 año ago | 1 answer | 0

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Question

Reshape the Matrix to complex number ?
I have Matrix-like the following N=64 %X is the complex number % complex number(a+ib) where (a) is real and (ib)is imag num...

alrededor de 1 año ago | 1 answer | 0

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Question

I want to cancel the negative sign out of IFFT
I want to cancel the negative signal out of IFFT and allow the positive signal to pass and add DC-bias in the output signal ...

alrededor de 1 año ago | 2 answers | 0

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Question

complex number separate the real signal about imag signal
I have a problem with the complex number comp=a+ib a1+ib1 a2+ib2 ... ... .. an+ibn then I separated the real signal ab...

alrededor de 1 año ago | 1 answer | 0

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Question

how separate the complex number as shown in the explain as following?
I have a problem with the complex number comp=a+ib a1+ib1 a2+ib2 ... ... .. an+ibn then I separated the real signal ab...

alrededor de 1 año ago | 1 answer | 0

### 1

Question

how to apply hermitian symmetry to mitigate imaginary of IFFT?
I want to insert a Hermitian symmetrical to remove the imaginary signal when exiting from QAM or OQAM and entering to I(FFT) not...

alrededor de 1 año ago | 0 answers | 0

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Question

real and imaginary complex I(FFT)
How to separate the real number from the imaginary number in the complex number? with I(FFT). like a+bi a2+bi2 . . . to ...

alrededor de 1 año ago | 1 answer | 0

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Question

how DCO-OFDM programming by matlab
any one help me to program DCO-OFDM or direct me towards the right programming path?

alrededor de 1 año ago | 0 answers | 0

### 0

Question

What are the split-radix For FFT?
any one help me in code and explain the split-radix for fast fourier transformer ?

alrededor de 1 año ago | 0 answers | 0