in this research, active capacitance circuit and the feature of negative resistance are analysed in details. also, a new active filter is presented based on active capacitance circuit. for simulations, we used matlab and advanced design system(ads). proposed active filter (rf) is a narrow band filter. the results of simulation shows some aspects of sustainability and low noise feature. the circ...

the main aim of this paper is to find the optimum shape of arch dams subjected to multiple natural frequency constraints by using an efficient methodology. the optimization is carried out by charged system search algorithm and its enhanced version. computing the natural frequencies by finite element analysis (fea) during the optimization process is time consuming. in order to reduce the computa...

quorum-based power saving (qps) protocols allow “asynchronous” wireless hosts, operating in a multi-hop ad-hoc network, to tune to the low power mode conceived in ieee 802.11 mac standard. qps schemes guarantee that the wake-up schedule for every two neighboring hosts would ultimately overlap within a bounded latency so as to be able to accomplish their reciprocal “unicast” communications. a ma...

The Global Positioning System (GPS) can be utilised in a wide range of deformation monitoring applications, such as the monitoring of active volcanoes, tectonic fault lines, landslides, ground subsidence, bridges, dams, high-rise buildings, etc. During the past few years a methodology has been developed for processing data collected by GPS networks consisting of a mixed set of single-frequency ...

In this study, we present a single-carrier frequency domain adaptive antenna array (SC-FDAAA) scheme for the uplink transmission and apply the SC-FDAAA scheme to single cell and cellular distributed antenna network (DAN) as well. It is shown by simulation results that the SC-FDAAA scheme can effectively suppress the interfering signals in a severely frequency selective fading channel both in th...

The Global Positioning System (GPS) can be utilised in a wide range of deformation monitoring applications. During the past few years a methodology has been developed for processing data collected by GPS networks consisting of a mixed set of single-frequency and dual-frequency receivers. The strategy is to deploy a few permanent, ‘fiducial’ GPS stations with dual-frequency, geodetic-grade recei...

This paper presents a study of cyclic delay diversity (CDD) for a single frequency network (SFN) using digital radio mondiale (DRM) standard. Flat fading over the bandwidth can entirely disrupt the signal during several orthogonal frequency division multiplexing (OFDM) symbols. In such conditions, channel encoding can only partially recover the sent information. In order to overcome this proble...

OpenAirInterface is an experimental open-source real-time hardware and software platform for experimentation in wireless communications and signal processing. With the help of OpenAirInterface researchers can demonstrate novel ideas quickly and verify them in a realistic environment. Its current implementation provides a full open-source software modem comprising physical and link layer functio...

The time-frequency-code slicing technique allows multiple users with different data-rate requirements access to a communications resource in a manner that is cost effective over a wide range of access rates. For instance, with a timefrequency slicing (TFS) approach, users are assigned different portions of the frequency spectrum (e.g., on a slot-by-slot basis), granting them access to a fractio...