This paper compares a stub and a decoupling capacitor for power supply noise reduction. A quarter-length stub attached to the power supply line of an LSI chip works as a band-eliminate filter, and suppresses the power supply bounce of the designed frequency. The conditions where the stub is more effective than the same-area decoupling capacitor are clarified. The stub will work more efficiently...

While heteronuclear broadband decoupling by composite pulse sequences is a well established method in isotropic liquids [ l-41, analogous decoupling sequences for oriented systems have been introduced only recently [ 5-91. Those sequences [ 891, termed COMARO, were derived from a theoretical analysis of heteronuclear decoupling in the presence of homonuclear interactions like dipole-dipole and ...

We study the dynamical decoupling of multiqubit states from environment. For a system of m qubits, the nested Uhrig dynamical decoupling (NUDD) sequence can efficiently suppress generic decoherence induced by the system-environment interaction to order N using (N + 1)2m pulses. We prove that the NUDD sequence is universal, i.e., it can restore the coherence of an m-qubit quantum system independ...

Direct detection of (13)C can be advantageous when studying uniformly enriched proteins, in particular for paramagnetic proteins or when hydrogen exchange with solvent is fast. A scheme recently introduced for long-observation-window band-selective homonuclear decoupling in solid state NMR, LOW-BASHD (Struppe et al. in J Magn Reson 236:89-94, 2013) is shown to be effective for (13)C(α) decoupli...

Wireless Local Area Networks (WLANs) have been widely developed during this decade, due to their mobility and flexibility. During this period, IEEE 802.11 has become the dominant WLAN protocol. This thesis reports on research into WLANs, especially IEEE 802.11 networks. Since IEEE 802.11 defines rules at the MAC and Physical (PHY) layers, which are introduced in Chapter 1, the first part (Chapt...