The cold start of the space GPS receiver, i.e. without any information about receiver position, satellite constellation, and time, is complicated by a large Doppler shift navigation signal caused movement on Earth orbit. That increases five times search signals compared to standard receiver. paper investigates method acceleration time designed for pico- femto-satellites. proposed based combinat...

High speed data transmission is foreseen to count for the main volume of mobile traffic consumption in the future wireless networks. Moreover, 80% of the data traffic is expected to be generated inside of buildings, i.e., an office building, airport or on campus. Along with the fast evolution of data traffic need (traffic volume and peak data rates), it will become extremely difficult to serve ...

Femtocell is an emerging technology for expanding cell coverage and increasing data rate, and its users deploy in their own premises by themselves. Therefore, femto base stations cannot go through manual cell planning procedure as the mobile communication base stations do. Femto base station sets its parameters, such as transmit power or pilot power, considering the surrounding radio environmen...

In this paper, we investigate the impact of femtocell deployment density and femtocell isolation on the downlinkperformance of Orthogonal Frequency Division Multiple Access (OFDMA)-based macrocellular Long Term Evolution (LTE) networks by system level simulations. Femtocell isolation is defined as the separation between macroand femto tiers by wall penetration loss. We evaluate the relation bet...

In this paper we investigate the performance of mobile user connectivity in femtocell/macrocell networks. The femto user equipment (FUE) can connect to femto access point (FAP) with low communication range rather than higher communication range to macro base station (MBS). Furthermore, in such emerging networks, the spatial reuse of resources is permissible and the transmission range can be dec...

We have used a multi-particle imaging technique (COLTRIMS) to observe the double ionization of rare gas atoms by multi-photon absorption of 800 nm (1.5 eV) femto-second laser pulses and by single photon absorption (synchrotron radiation). Both processes are mediated by electron correlation. We discuss similarities and differences in the three-body final state momentum distributions.

Femtocells have been considered as a promising technology to provide better indoor coverage and spatial reuse gains. However, the co-channel deployment of macrocells and femtocells is still facing challenges arising from potentially severe inter-cell interference. In this article, we investigate the uplink resource allocation problem of femtocells in co-channel deployment with macrocells. We fi...

Targeting the indoor users, Femtocells are deployed inside the buildings to boost the signal strength and provide higher datarates. Femtos play an important role in 4G LTE standard and an optimal placement is of immense importance for realizing full benefits of 4G LTE to indoor users. Minimizing the number of Femtos within an enterprise building and promising a minumum threshold SINR for all UE...