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In order to solve this problem (to guarantee that there is a valid solution) do we have to add conditions or assumptions on the operational environment and\or the used model? Since there are many parameters used to specify the system like the number of sources, the number of array elements ...etc. are there conditions that should be met first? Toward this goal we want to make the following assumptions:<ref name="utexas1"/><ref name="ref2"/><ref name="ref6"/>
# The number of signals is known and is smaller than the number of sensors, {{math|q < r}}.
# The set of any q steering vectors is linearly independent.
# Isotropic and non-dispersive medium – Uniform propagation in all directions.
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