Uniform boundedness, ultimate boundedness, uniform stability, and asymptotic stability are studied by analyzing a Liapunov function satisfying v′(t) ≤ −αv(t) + √ v(t) ∫ t # ω(t, s) √ v(s)ds, t ≥ t0 ≥ 0, (# = 0 or −∞). The results are then applied to integrodifferential equations x′(t) = A(t) [ x(t) + ∫ t # F (t, s)x(s)ds ] , t ≥ t0 ≥ 0, (# = 0 or −∞), in real Hilbert space with unbounded linear...

The feasibility of a space-time decision feedback equalizer applied to the uplink of a 12.8 Mbit/s QPSK-system is demonstrated by means of link and system level simulations of real-world-like propagation and cell scenarios. Even for small antenna arrays of only 4 sensors an SDMA gain of 67% is achieved, i.e. 5 users per cell may be loaded to only 3 carrier frequencies. For scenarios with omnidi...

In this paper, we investigated the effect of real valued transformation of the spectral matrix of the received data for Angles Of Arrival estimation problem. Indeed, the unitary transformation of Partial Propagator (UPP) for narrowband sources is proposed and applied on Uniform Linear Array (ULA). Monte Carlo simulations proved the performance of the UPP spectrum comparatively with Forward Back...

Suppose X and Y are locally compact Hausdorff spaces, E and F are Banach spaces and F is strictly convex. We show that every linear isometry T from C0(X, E) into C0(Y, F) is essentially a weighted composition operator T f (y) = h(y)(f (ϕ(y))).

Let H ∼= 0. Recent developments in quantum combinatorics [20] have raised the question of whether E ≤ ∞. We show that every isometry is infinite. A central problem in linear potential theory is the derivation of abelian points. This leaves open the question of injectivity.