The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We consider a wireless network with n users distributed over a square area A = n. Under line-of-sight propagation, this network has Θ(√n) degrees of freedom. At high SNR, these degrees of freedom can be readily achieved by multi-hop relaying between nodes. At low SNR however, the performance is determined by the power transfer in the network. We show that none of the existing architectures can achieve...
Disasters may destroy everything including communication infrastructures isolating people in the disaster-stricken areas. Recovery of these infrastructures is often prolonged which is not suitable for disastrous fast-responses. This paper proposes a wireless multihop access network virtualization (WMANV) approach thereby users/victims are provided Internet access transparently. Concretely, users are...
Hidden node collision is a significant problem in CSMA/CA (Carrier-Sense Multiple Access with Collision Avoidance)-based multihop networks such as wireless sensor networks. The RTS/CTS (Request to Send/Clear to Send)-based handshaking mechanism is not effective to solve this problem in multihop networks. Also, to reduce power-consumption, such a handshaking mechanism is not used in CSMA/CA networks...
In this paper, we propose a novel multihop transmission scheme using selective network coding (NC) and differential modulation (SNC-DM) for two-way relay networks (TWRNs) when neither the source nodes nor the relay nodes know the channel state information (CSI). We first develop a bidirectional transmission scheme using NC where the information exchange in a two-way multihop relay network with the...
A wireless mesh network (WMN) is a peer-to-peer multi-hop wireless network in which nodes cooperate with one another to route packets to the gateway. In multi-hop wireless networks, flows spanning multiple hops experience more contentions in order to access the medium compared to those closer to their destination. Thus, nodes with longer distance to the gateway suffer from bandwidth starvation. In...
By employing a relay station (RS) on the WiMAX networks, it offers an extended coverage and improved capacity over wireless broadband. However the mobile station (MS) such that connected to the RS has effect the system performance due to increase of the MS numbers. In WiMAX the base station (BS) adopts the centralized-based polling mode where the best way to guarantee the delay bound is by polling...
Due to the dynamic interruptions from the primary users (PUs), the secondary user (SU) (i.e., cognitive radio) network is highly dynamic with fast varying radio resources. Once a PU requests to occupy the licensed spectrum, all of affected SUs (i.e., those SUs who opportunistically access the licensed spectrum) are mandated to immediately terminate the spectrum usage and switch their data transmissions...
A multi-hop wireless network is considered promising for the next-generation communication systems because of its wide applicability to hard-to-wire circumstances. However, the throughput of a multi-hop wireless network based on the widely accepted IEEE 802.11 Standards is so low due to inter-flow and intra-flow collisions that further applications of the network are limited. To solve this problem,...
The aim of this paper is to examine the benefit of rapid dynamic antenna tilting on a WCDMA cellular network, where dynamic antenna tilting is applied as either a SON implementation or a MIMO implementation. The potential network performance improvement of this technique is evaluated using a dynamic WCDMA/LTE simulator and the results presented suggest that downlink performance gains of up to 89%...
In this paper, we propose a joint channel allocation and multicast routing scheme for a multihop cognitive radio network. Our scheme can react to the dynamic change of channel availability. It can maximize the multicast throughput by jointly performing channel allocation and multicast routing. We first model the activities of the primary users, channel availability and the interference among the secondary...
In multi-hop networks, conventional forwarding along a unicast route forces the data transmission to follow a fixed sequence of nodes. In previous works, it has been shown that widening this path to create a corridor of forwarding nodes and applying OFDMA to split and merge the data as it travels through the corridor towards the destination node leads to considerable gains in achievable throughput...
Interference management is an important problem in wireless networks. In this paper, we focus on the successive interference cancellation (SIC) technique, and aim to design an efficient cross-layer solution to increase throughput for multi-hop wireless networks with SIC. We realize that the challenge of this problem is its mixed integer linear programming formulation, which has bunches of integer...
Recently, machine-to-machine (M2M) communication becomes an attractive topic due to the rapid evolution of wireless communication systems and the potential market size of Internet of Things. In this paper, we investigate a M2M network with typical M2M features. Three key parameters, throughput capacity, delay and energy consumption, are analyzed to evaluate the performance of the M2M network under...
High Speed-Single Frequency Network (HS-SFN) is one of the possible multipoint transmission techniques proposed in the 3GPP standard for High Speed Downlink Packet Access (HSDPA) in order to improve network performance, especially at the cell edge. It allows neighboring cells to transmit simultaneously the same data stream to a User Equipment (UE) in the Handover region (HO). In order to evaluate...
Due to a poor understanding of the interactions among transmitters, wireless multihop networks have commonly been stigmatized as unpredictable in nature. Even elementary questions regarding the throughput limitations of these networks cannot be answered in general. In this paper we investigate the behavior of wireless multihop networks using carrier sense multiple access with collision avoidance (CSMA/CA)...
The capacity scaling laws of two overlaid networks sharing the same wireless resources with different priorities are investigated. The primary network is assumed to operate in an order-optimal fashion to achieve its standalone capacity scaling law. The secondary “cognitive” network must keep its interference to the primary network below a certain threshold while at the same time maximizing its own...
Quick growth in the amount of wireless subscribers coupled with the necessity to provide desired level of user experience for broadband, stimulates mobile operators to improve the efficiency of their limited air resources by using different technologies. This paper discusses the study on Single Frequency Network (SFN) based multipoint-to-point transmission scheme as a possible way to improve the usage...
In this paper, a new cross layer design of MAC and Routing protocol for OFDMA-based Multi-hop Ad-hoc Networks is proposed. In wireless network, when a route is established, the radio resource allocation problems at MAC layer may decrease the end to end performance proportionally with the length of each route. The contention at MAC layer may causes routing protocol to respond by finding new routes...
The IEEE 802.16j Mobile Multi-hop Relay (MMR) WiMAX networks allow the extension of the coverage area of a WiMAX network by deploying a relay station (RS). In WiMAX, subscriber station (SS) located non Line-of-sight (LOS) with the BS suffers from deterioration in service. In this paper, we investigate the usage of RS in improving the per-user throughput. Simulations are performed using OPNET Modeler...
The evolution of wireless access technologies, the increasing demand of users and services, and the evolution of terminals (which have the ability to connect to different access technologies), strengthened the need to use all the available resources in an optimal way. This paper presents a new approach that uses the combination of multihoming and network coding to improve the allocation of network...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.