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This paper presents a comprehensive simulation study on the performance of broadband coupling-element-based multiantenna structures on a mobile terminal at the 2000 MHz Universal Mobile Telecommunications System (UMTS) frequency band with varying two significant hand effects; vertical position of hand along terminal chassis, and distance between hand palm and terminal chassis. The results reveal that...
In this paper, a new joint scheduling and hybrid resource allocation method is derived and investigated for a multi-user downlink Orthogonal Frequency Division Multiple Access (OFDMA) system that provides Time Delay-Sensitive services (TDS) and Time Delay-Insensitive services (TDI). A three sectored multi-cellular heterogeneous traffic environment is considered where users are randomly distributed...
Base stations (BSs) are the main energy expenditure elements of cellular networks, considering the high coverage requirements and the fact that the total provisioned capacity is intended to match peak hour traffic demand. In this paper, we introduce energy saving algorithms based on coordination between network elements. We introduce the notion of energy partitions - associations of powered-on and...
The problem of dynamic Quality of Service (QoS) management for multimedia services has been addressed from two complementary, yet interrelated directions; one mainly dealing with designing adaptive or “elastic” services, and the other, dealing with “smarter” resource allocation. We adopt this approach in this paper, by performing a graceful quality degradation and the corresponding resource (re)allocation...
Cooperative decoding is powerful technique for establishing good quality TV broadcasting. In cooperative decoding, some TV receivers, nodes, are cooperated, each other. These share the received information signal and thus obtain good quality information signal. Incremental-Maximum Ratio Combining (I-MRC) is one of the cooperative decoding methods. In I-MRC, the best condition's node and second one...
Open access is one of the access options for femtocell networks, where the mobile stations (MSs) are allowed to make hand-off to the femtocell base stations (fBSs) in their vicinity. In this paper, several performance trade-offs that are related to the deployment of open access femtocell networks are presented through computer simulations. In particular, first, impact of a capacity-based cell selection...
In a downlink transmission, users can benefit from the high capacity gain achieved by transmitting independent data streams from multiple antennas to multiple users sharing the same physical time-frequency resources. This technique is known as multiuser MIMO (MU-MIMO). However, performance of MU-MIMO is sensitive towards propagation imperfections, such as time dispersion and inter-stream interference...
Underlining the viability of multiuser (MU) MIMO for future wireless communications as long term evolution (LTE), we propose in this paper a precoding strategy based on the low resolution LTE precoders which necessitates 2 bits feedback from the user equipment (UE). The proposed strategy encompasses geometrical interference alignment at eNodeB (LTE notation for base station) followed by the exploitation...
In the bistatic radar, it is important to suppress the undesired signals such as the direct propagated signal from transmitter and its multipath components. Conventionally, the suppression method by subtracting the replicas of the undesired signals is often used. However, it requires the precise delay times of the undesired signals. In this paper we propose a new method to detect the target without...
The next generation of cellular networks (Long Term Evolution) uses SC-FDMA (Single Carrier Frequency Division Multiple Access) on the uplink. In SC-FDMA, the uplink resources assigned to a user are called Resource Blocks (RBs) each of which consists of a set of consecutive subcarriers spanning all symbols available for data. Since at most one User Equipment (UE) is assigned to each RB then uplink...
The Wireless Local Area Network (WLAN) is a very effective communication technology for the management in emergency environments, which has been developing rapidly during the past years. In this paper, a carrier frequency offset (CFO) estimation algorithm for the WLAN is presented. The results of simulation prove the error mean and variance of CFO estimation algorithm is low, and the calculation speed...
The design of telecommunication network concerns the selection of arcs in a graph with involved cost as low as possible, but satisfies constraints such as point-to-point demands routed across the network, arc capacity, hop constraints and so on. Such a design must allocate enough flows and diverse routing paths through the network to ensure that feasible information flows continue to exist, even when...
In this paper, the Multiprocessor Bandwidth Inheritance (M-BWI) protocol is presented, which constitutes an extension of the Bandwidth Inheritance (BWI) protocol to symmetric multiprocessor and multicore systems. Similarly to priority inheritance, M-BWI reduces priority inversion in reservation-based scheduling systems, it allows the coexistence of hard, soft and non-real-time tasks, it does not require...
Due to the heterogeneous multi-core architecture of the CellBE processor, the existing MPI implementation cannot effectively exert the SPE computing capability. In this paper, we design and implement a multi-node MPI programming and running environment for CellBE processor. The MPI communication library prototype, which mainly includes the basic point-to-point communication and the multicast communication...
As a large-scale global parallel file system, Lustre file system plays a key role in High Performance Computing (HPC) system, and the potential performance of such systems can be difficult to predict because the potential impact to application performance is not clearly understood. It is important to gain insights into the deliverable Lustre file system IO efficiency. In order to gain a good understanding...
The proliferation of Telecom and broadband industry has proven as one of the fastest industry over the last two decades in Pakistan. The growth in the sector has given birth to massive demand of service provisioning and new entrepreneurs to step forward and invest. The study focuses on today's telecom sector, its existing businesses by analyzing market behavior and limited analysis of existing market...
Adapting resource management, for vague environments, in wireless communication proved to be a measure point of research recently. In this paper we present a system that is capable of adapting some important resources (type of modulation, code rate and number of subcarriers) for blurred channel conditions. The system in this work is mainly designed for WiMAX, which proved to be one of the prominent...
DSR protocol is one of the representatives of Ad hoc network with on-demand routing protocols, whose working process is mainly divided into two parts: detect and maintain routings. wormhole attack is a special way to attack routing protocols of Ad hoc network. According to the analysis of DSR protocol and conditions of wormhole attack, the process and algorithm of wormhole attack to DSR protocols...
The traditional video broadcast system can not adapt to the variable terminals and heterogeneous network in modern times, this paper presents a video broadcast system solution based on scalable video coding. The presented system improves the shortages caused by variable terminals and heterogeneous network, and consequently, providing a better video service by adopting scalable video coding scheme.
Mobile Ad-hoc Network (MANET) has emerged as the self organized wireless interconnection for the various applications in random topology. How ever, achieving reliable multicast transmission in MANET is crucial due to the change in network topology caused by the node mobility. Modern communication network is becoming diverse and heterogeneous. This is the consequence of an increasing array of devices...
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