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how to fit a BER graph

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ige1986

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hi, i've graph in my simulation (ds cdma on urban channel ,BER versus Eb/N0) which is smooth and broken, i want to achieve theorical results by using a matlab functions to fit the graphe like the functions : smooth, BERFIT. but the graph stay far from the theorical, please help me.
 

hello, by using curve fitting in toolboox, i'm okay with you it is very powerful to fit a graph, but i met a problems to fit the BER vs Eb/N0 , when i use curves fitting the graph is fitted ok but it don't take the forme of BER but it is reversed and i can't rotate it,
please write me the syntax how to fit a BER graph by curves fitting of toolboox
 

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