This is using Trust-Region algorithm to solve THE 4-dimensional optimization problem. 

function_input.m is the main function. Start with it.

The fist half of the code is for constructing MIMO radar receive signal model, which needs no any change of seeting-ups. The second halp is Trust-Region with different choices of combinations. Here we choose DFP+Dogleg and DFP+2-dimensional subspace minimization. Control of choosing methods can be made.