  A decomposition of the level-one $q$-deformed Fock representations of $\uqn$
is given. It is found that the action of $\upqn$ on these Fock spaces is
centralized by a Heisenberg algebra, which arises from the center of the affine
Hecke algebra $\widehat{H}_N$ in the limit $N \rightarrow \infty$. The
$q$-deformed Fock space is shown to be isomorphic as a
$\upqn$-Heisenberg-bimodule to the tensor product of a level-one irreducible
highest weight representation of $\upqn$ and the Fock representation of the
Heisenberg algebra. The isomorphism is used to decompose the $q$-wedging
operators, which are intertwiners between the $q$-deformed Fock spaces, into
constituents coming from $\upqn$ and from the Heisenberg algebra.
