Three strains of facultatively anaerobic thermotolerant and moderately halophilic bacteria were isolated from two Jordanian hot spring locations. The novel Bacillus strains were short rods, Gram-positive, motile and spore formers. The strains were capable of anaerobic (but not aerobic) growth at 63C, moderately halophilic, able to grow at NaCl concentration range of 12 15 % and at temperatures ...

Design interest for an efficient call admission control (CAC) scheme for a mixed cell (i.e., a 3G cell with embedded WLAN hotspots) is proliferating for the traffic load sharing between 3G and WLAN to improve system capacity and performance as well. Some article proposes CAC schemes to increase 3G system capacity and to reduce dropping probabilities of handoff calls by using WLAN hotspots. Most...

Direct Sequence Code Division Multiple Access (DS-CDMA) is a schemewhere several users transmit their data simultaneously over common wireless communication channel,by spreading each by distinct codes. At the receiver, individual are detected appropriate decoding. In this paper, new smart receiver proposed for detecting DS-CDMA signals based on multi-layer Feed Forward Neural Network (FFNN). Th...

Abstract An assessment of standalone GLONASS RTK performance is provided using its FDMA and CDMA signals. The new integer-estimable model (Teunissen 2019), which guarantees the integer-estimability ambiguities, employed. We introduce combined FDMA+CDMA compare strength against for instantaneous integer ambiguity resolution positioning. Various combinations signals are considered including L1, L...

Sparse code multiple access (SCMA) is one of the promising candidates for new radio interface. The generation communication system expected to support massive user with high capacity. However, there are numerous problems and barriers achieve optimal performance, e.g., multiuser interference power consumption. In this paper, we present optimization methods enhance spectral energy efficiency SCMA...

Over the past few years, Wireless Local Area Networks (WLANs) have been extensively deployed and have significantly evolved. However, the deployment of large-scale WLAN still presents management issues. Moreover, while newer WLAN technologies and services have been emerging at a prolific rate, the architecture of WLAN networks has been quite static and has seen difficulties to evolve. In this p...

This paper proposes a novel load balancing scheme, for an operator-deployed cellular-WLAN heterogeneous network (HetNet), where the user association is controlled by employing cell breathing technique for the WLAN network. This scheme, eliminates the complex coordination and additional signalling overheads between the users and the network, by allowing the users to simply associate with the ava...

Wireless local area network (WLAN) has been widely used in many sectors. The popularity gained is due to many reasons, such as ease of installation, installation flexibility, mobility, reduced cost-of-ownership, and scalability. However, regardless of the benefits, WLAN have some security threats. This paper begins by introducing the concept of WLAN. The introductory section gives brief informa...

© 2013 ETRI Journal, Volume 35, Number 6, December 2013 http://dx.doi.org/10.4218/etrij.13.0213.0404 Dual-mode terminals (DMTs) equipped with cellular and WLAN interfaces have become popular in recent years. Users of DMTs can enjoy high-speed WLAN Internet access and wide area Internet access to cellular networks. However, a DMT may consume power inefficiently when discovering a WLAN with inher...