No abstract

No abstract

SUMMARYMultilayer multistage interconnection networks (MLMINs) integrate communication with network components and the components of parallel systems, especially when they service multicast traffic. This paper presents an approximate performance methodology for self-routing MLMINs that consist of two segments, each of which is composed of symmetrical switch elements. The first segment is subject to blocking situations with one mode of packet transmission policy (unicast). The second segment-the multilayer-is blocking free and employs double modes of transmission policy (unicast and multicast replication). Applying the current analytical model, which is based on a convergence method on the above types of MLMINs, an estimate can be made of their performance indicators. This model was applied to variable network size MLMINs under different multicasting patterns of traffic. It was also validated by extensive simulations. All the MLMINs under study apply special packet (traffic) management techniques, which allow for the integration of sub-networking into larger networks such as grids. The results are accurate and useful for network engineering, especially in the service of local area networks.

Constructing capable and scalable parallel computers or connecting contemporary networks efficiently makes multistage switching networks essential and significant devices. This is why they remain an interesting field of research and are being continually improved. This paper introduces a new idea-a new architecture-to ameliorate the behaviour of the networks' connection points.The proposed novel construction accommodates multiple internal paths and a fan-out at the end. Via this study, basic features of this introduced fabric (such as cost, reliability, and performance measures) are presented in a quantitative manner. Moreover, some comparisons-especially in terms of complexity, cost, and reliability-with other similar modern constructions that also enclose multiple internal routes are shown. This study reveals that the proposed multistage system improves performance metrics, fault tolerance, and reliability and indicates that due to its properties, this innovative device can be used in the commercial sector. KEYWORDS multistage architecture, multilayer multistage interconnection networks, performance evaluation, quantitative analysis, reliability Int J Commun Syst. 2018;31:e3785.wileyonlinelibrary.com/journal/dac

5G is the latest mobile communications standard that is spreading fast across the world. Recently defined requirements for 5G systems have led to higher applications’ requirements regarding data rates, lower requirements for latency, and higher efficiency regarding the spectrum usage. Universal Filtered Multi-Carrier (UFMC) is one new candidate modulation scheme for emergent Fifth Generation (5G) communication systems. This paper focuses on Universal Filtered Multi-Carrier (UFMC) design aspects in terms of Bit Error Rate (BER) performance in relation to the filter length used in subband filtering. Simulation results show that BER and CCDF performance varies for different filter lengths and modulation schemes. The main achievement of this work is that the results show that different Dolph–Chebyshev FIR filter lengths do not affect the BER performance both for the 64 and 256 QAM.

No abstract

Multistage Interconnection Networks (MINs) are used in wide applications of multiprocessor systems in order to set up connections between various nodes such as processors and memory modules. Reliability can be considered as one of the most challenging issues in these systems because this can degrade or cancel the network performance and consequently the effort of the whole system. Here, a type of multistage fabric called U-type is selected for study, particularly in terms of its reliability. This fabric turns out to be the most appropriate type for constructing parallel systems due to the particular features that it possesses. This study reveals that U-type fabrics are ideal devices as they present mostly high values of reliability and low values of latency compared to unidirectional fabrics. This behaviour becomes more intensive when it is used in a cluster that demands service that includes a high percentage of “local type traffic.” Thus, U-type multistage devices can considerably enhance the connection points in constructing parallel systems, improving internal data flows.

No abstract