where [[??].sub.i,m] and [mathematical expression not reproducible] are

unitary matrices satisfying [mathematical expression not reproducible] and [mathematical expression not reproducible].

where P and Q are p x p

unitary matrices, [SIGMA] is a diagonal p x p matrix with nonnegative real numbers, and [Q.sup.*] is the complex conjugate transpose of Q.

where the time-independent matrices [K.sub.n], n [member of] N, are arbitrary 2 x 2

unitary matrices; that is, they satisfy the relations

Arguably no other class of matrices has enjoyed such success, with one exception,

unitary matrices.

Unitary matrices share many of the same properties as symmetric ones: normality, localized eigenvalues, and special condensed forms, which allow to represent symmetric and

unitary matrices with two vectors.

[[U.sub.1,k] [U.sub.2,k]] and [[V.sub.1,k] [V.sub.2,k]] are

unitary matrices.

where U and V are N x N

unitary matrices (i.e., [UU.sup.T] = [U.sup.T]U = I), and [summation] is an N x N diagonal matrix containing the singular values.

The optimal packing method of searching the orthogonal

unitary matrices over Grassmannian manifold and the corresponding searching algorithm are investigated.

In this section, we propose the one-way relay system, whose key idea to structure the quasi-EVD channel is using the relay function to cancel the

unitary matrices of multiple access channel (MAC) and broadcast hermitian channel (BHC).

in which [I.sub.t] is a t x t identity matrix, then [P.sub.t], [Q.sub.t], [S.sub.t], [R.sub.t] are

unitary matrices.

where U = [[u.sub.1], [u.sub.2], ..., [u.sub.M]] and V = [[[upsilon].sub.1], [[upsilon].sub.2], ..., [[upsilon].sub.N]] (having dimensions Q x Q and N x N) are left and right

unitary matrices respectively.

Let U(N) denote the group of all N x N

unitary matrices. The infinite dimensional unitary group is defined as the inductive limit of U(N)s, where U(N) embeds in U(N +1) by fixing the N + 1st vector:

where V and U are

unitary matrices, that is, [V.sup.-1] = [V.sup.H] and [U.sup.-1] = [U.sup.H] (with H the Hermitian operator) and D is a diagonal matrix containing the singular values of H.