I am working on the concept of Robust multiuser detection in multi-carrier cdma to supress MAI and narrowband interference. I am stuck with the execution of my code in matlab. Since Robust m-estimation here, is used in the weighted Recursive least M-estimate multiuser detector, I am going in that direction. I want to apply the basic detection techniques like mmse, mrc, egc etc for the mccdma system, and want to study it's performance. But couldnot know how to change the system model at the receiver retaining multiuser detection concept.

Jp=1/(σ(v,n)^2 ) ∑(n=0) to (N-1)▒ρ(yn(τ)-Snz(τ)).

Where

Jp-objective function, N- no. of subcarriers, ρ()-M-estimate function, yn(τ)-received signal,Sn-G(T)C,

where G(T)-channel frequency response and C-walsh-hadamard code.

Z(T)=sqrt(p)b(T), where sqrt(b)-power, b(T)-input data of users.

Also I want to know how the noise variance(mixture of gaussian noise variance and narrowband interference) at different subcarriers can be evaluated in matlab.

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