Abstract-5G technology is a broad concept that describes the envisaged disruptive evolution of communication technology in the near future, with a dramatic increase in the network datarate and capacity to support a variety of innovative services. The exploitation of the new spectrum available at mmWaves represents a key enabler for 5G. mmWaves are expected to revolutionize the indoor wireless connectivity providing a very large capacity at very high data rates. It is well known that mmWaves radio links are strongly influenced by human bodies and this issue is very relevant in indoor environments. Several models are available for ray-tracing investigations and lineof-sight blockage, whereas statistical models enabling tractable analytical studies and simulations of mmWaves wireless systems, accounting for people in the link's proximity, are still lacking. In this paper, measurements of 60 GHz channel impulse responses in static but "evolutionary" office scenarios that involve one, two and three individuals are presented. Regression fits are applied to the experimental responses to obtain an accurate characterization of human-induced shadowing events in both proximity and blockage situations. Tractable statistical models are provided for different scenarios and for eight carrier frequencies spanning the bands from 54 to 59 GHz and from 61 to 66 GHz.
Abstract. In the computer networks, the data traffic transmission is based on the routing protocol which select the best routes between two nodes. Variety of routing protocols are applied to specific network environments. Routing protocol is taking a crucial role in the modern communication networks and its functionality is to determine how the routers communicate with each other and forward the packets through the optimal path from source to destination node. In this paper, two typical types of routing protocol are chosen as the simulation samples: EIGRP and OSPF. Each of them has different architecture, route delays and convergence characteristics. The aim is to present a simulation based comparative analysis between EIGRP and OSPF for real time applications considering realistic backbone communication links and existing subnets. The evaluation of the proposed routing protocols is performed based on the widely accepted quantitative metrics such as: convergence time, end-to-end delay, jitter, packet loss and throughput of the simulated network models. Tractable conclusions and discussions are presented for each protocols and multi-protocol network implementations.
Ultra-wideband (UWB) radios have the potential to achieve very high data rates. However, the coverage is limited over very short ranges, due to the tight limits imposed to the allowed transmission power by the worldwide spectrum regulation at microWaves. Recently, a very large bandwidth has been made available by worldwide regulation at mmWaves. Wide consensus is achieved on the future utilization of the spectral region around 60 GHz for multi-Gbps wireless LAN connectivity. Given the availability of a very large band, up to 7 GHz, mmWaves appear as the natural candidate for UWB transmissions. The aim of this paper is to evaluate the performance of impulse radio (IR)-UWB signalling when operating at mmWaves, i.e., around 60 GHz. The analysis is based on a semi-analytical approach, where the bit error rate (BER) for pulse position modulation (PPM) and pulse amplitude modulation (PAM) is analytically computed and averaged over the empirical probability density function of the signal-to-noise-ratio (SNR) as obtained from a significant set of experimental impulse responses of the UWB indoor channel at mmWaves. These channel impulse responses have been collected through a measurement campaign in a modern office building at eight carrier frequencies spanning the band from 54 to 59 GHz and from 61 to 66 GHz. The results show a promising potential for mmWaves UWB radios
Abstract. Nowadays, the modern companies and institutions have a inevitable need for secure connections with remote locations trough broadband WAN networks. The reason for such requisite is mainly the need for shared services utilization like application servers, database servers, messaging servers, etc., physically located at remote datacenters. In this paper, we present realistic VPN implementation and configuration for a company with two central locations (head office and warehouse) and branch offices in several cities. For secure communication between central locations and branch offices, Generic Routing Encapsulation (GRE) tunnels are implemented. EIGRP protocol is used for routing the data between networks. From the implementation analyses conducted in this paper, we can figure out that this approach allows low-complexity realization and low-cost maintenance solution.
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