how to write these two equations

[Adam Danz]

Is this a duplicate question or are you looking for answers to both questions?

https://www.mathworks.com/matlabcentral/answers/512723-how-to-write-this-equation

Answer 1

[David Hill]

Not sure what Tj means in the equation.

for k=1:K
    for j=1:K
        if j~=K
            R(j,k)=B/2*log2(1+(h(k)*a(j))^2/(sum((h(k)*a(j+1:K)).^2)+e*sum((h(k)*a(1:j-1)).^2)+1/rho));
        else
            R(j,k)=B/2*log2(1+(h(K)*a(K))^2/(e*sum((h(K)*a(1:j-1)).^2)+1/rho));
        end
    end
end

[Sultan Al Harthy]

hello david hill, thanks for you answer and Tj is

T j denotes the targeted data rate satisfying the j t h user’s QoSrequirements,ρ=γ2·TSNR,TSNR=Pelec/N0B denotes the transmitted signal-to-noise ratio (TSNR)

would that change anything in the equation??

thanks

[David Hill]

I don't know. What should R be assigned if the above expression is not >=Tj? Also be advised, I did not know if j and k should start at 0 or 1. I chose to start at 1 due to the ease in matlab indexing, but it could be easily changed.

[Sultan Al Harthy]

thank you man, appreciate it

[Sultan Al Harthy]

hello david,

i am still trying to figure out, why do you have k=1:K, and j=1:K

i am trying to understand whether the equation you wrote is similar to the one provided,

thanks

[David Hill]

Show me your arrays (h and a). The equations I coded match those you provided. I assumed the length of array (h) was K (indexing from 1 to K) and the length of array (a) was also K. The first loop is for indexing into array (h). The second loop is for array (a).

[Sultan Al Harthy]

[Sultan Al Harthy]

yes david,

this is the information that has been given to me, and i have to write down all the equations and to calculate there values

id appreciate your help

thanks

[Sultan Al Harthy]

any idea?

thanks

[David Hill]

I can help with Matlab if you have any other specific questions. I believe the equations are correct but you will have to provide the correct inputs.

[Sultan Al Harthy]

i have added the required parameters, yet for some reason it doesnt work and this is my first time using matlab,

if there's somewhere youd recommend me to look online, i will study the concept behind it,

or i can email you what exactly im trying to do, so we can be on the same page

thanks

[David Hill]

I assume you are trying to get numeric solutions; therefore, your arrays of (h) and (a) need to be numeric and you need to assign a values to B, K, e, and rho before the above loops can be entered. Additionally, you will want to preallocate R:

R=zeroes(K,K);

[Sultan Al Harthy]

i am confused