The phrase :
The variables define the search space which includes all the possible voltage patterns.
Why not feasible-
Its proper sense is "capable of being done, accomplished, or carried out". That is, it means the same as possible in one of the latter's senses, and its true function is to be used instead of possible where that might be ambiguous.
A thunderstorm is possible (but not feasible).
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Witness said it was quite feasible ([better possible)][1] that if he had had night binoculars he would have seen the iceberg earlier; We ourselves believe that this is the most feasible [better probable] explanation of the tradition.
(Fowler) Modern English Usage:
feasibility: (a) (of a design,project, etc.) capable of being done, practicable, (b) (of things in general, also of persons) capable of being dealt with successfully.
-Each case must be treated on its merits, but when the context requires the sense of likelihood or probability it is prudent to test first whether possible or probable might not be the more satisfactory word, and to use feasible only if both the other words seem unnatural or unidiomatic. [1]: http://www.gutenberg.org/files/15364/15364-h/15364-h.htm