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.
IEEE 802.16, also known as Worldwide Interoperability for Microwave Access, is a standardization effort carried out by the IEEE to provide last-mile broadband access to end users. The IEEE 802.16 standard supports two medium access control modes—a mandatory point to multipoint mode and an optional mesh mode. In this paper, we propose an asymmetric interference aware routing algorithm and a new multipointer...
The performance of smart grid applications such as advanced metering infrastructure (AMI) and demand response management (DRM) can be improved by exploiting wireless communication technologies. The communication data loading and data losses in smart grid impact the system. In this work, we propose the routing protocol which adopts the cooperative transmission architecture in smart grid communications...
In this paper, fault tolerance in a multi-radio network is discussed. Fault tolerance is achieved using the BeeHive routing algorithm. The paper discusses faults added to the system as random fluctuations in hardware radio operation. The multi-radio nodes are designed using WiMAX and WiFi Radios that work in conjunction using traffic splitting to transfer data across a multi-hop network. During the...
Wimax is an broadband wireless technology based on IEEE 802.16. It is very helpful and cheaper than other possible solutions. It is purely based on the 4G technology for the upcoming generation. In wireless technology the major problem is speed, Quality of Service, data rates in order to overcome that they going for some valuable technology. In this paper we consider WIMAX and WLAN for controlling...
This paper deals with the design of a Multi-radio Hybrid node that performs traffic splitting over a Multi-Hop Ad-hoc wireless network. The multiradio nodes have a WiMAX and a WiFi Radio that are used in transmitting data traffic over two different radio channels. Data traffic is split statically over a node and transmitted over the two radio channels. In the present work we consider the mobility...
Relay is one of major features considered for IMT-Advanced systems. The main function of relay station is to enhance the network capacity and extend the coverage area. The paper focuses on multi-hop routing mechanism used in relay WiMAX networks. The performance of routing path selection is based on the throughput and packet loss ratio for the downlink transmission. This paper proposes channel-aware...
Wireless mesh networks are at the forefront of the technological drive. Achieving high system throughput in these networks is challenging due to interference which limits concurrent transmissions. In this paper we study routing and link scheduling in time division multiple access networks free of contention. We extend the work in the literature in several ways: (a) we present simple joint routing...
In this paper, we address the problem of guaranteed transmission of video flows in the context of WiMAX mesh networks for video surveillance purposes. The main design issue in such networks is to maximize the number of flows that can be accommodated in critical situations. Guaranteeing a throughput for individual flows in a multi-hop WiMAX network is a challenging task. We consider a specific dedicated...
The current convergence process in wireless technologies demands for strong efforts in the conceiving of highly flexible and interoperable equipments. This contribution focuses on one of the most important baseband processing units in wireless receivers, the forward error correction unit, and proposes a Network-on-Chip (NoC) based approach to the design of multi-standard decoders. High level modeling...
In this paper, we present a low-complexity decoder architecture for WiMAX low-density parity-check (LDPC) codes based on a unified task processor. Memory access is accomplished through routing networks with fixed interconnections and memory address generators, which are quite simple due to the quasi-cyclic structure of the LDPC codes. In order to increase the decoding throughput, the check-node and...
This paper demonstrates the usage of novel cognitive methods that improve the throughput of a WIMAX network by minimizing packet loss. The effects of the ant colony and fastest path routing algorithms on the throughput are investigated. a combination of Time Division Multiple Access (TDMA) and Orthogonal Frequency Division Multiple Access (OFDMA) spectrum sharing techniques is used. Data packet loss...
In the paper we investigate the methods of constructing the routing tree in WiMAX networks with mesh topology. The concept of network efficiency optimization by building the routing tree characterized by selected topological properties that are independent on network load is presented. As an important partial result, correlations between topological parameters of the tree and network efficiency have...
This paper studies the joint OFDMA resource allocation and QoS routing problem in a hybrid wireless network, which includes an OFDMA based cellular network and an ad-hoc network with many sensor nodes. In such application, each sensor node generates certain amount of data that need to be sent to cellular base station (BS). The cellular nodes act as gateway to forward all the uplink traffic. We formulate...
In this paper, we introduce cognitive wireless network for a disaster information system based on dynamic network reconfiguration method to improve the connectivity. Our network system is consisted of multiple mobile routers based on currently available wireless LANs including IEEE802.11b, g, j, n, IEEE802.16 (WiMAX), cellular networks. Using those different standardized wireless networks, the disaster...
In this paper the effectiveness of the networking existing data links to provide a robust and resilient network for the first responder's application is analysed. Methodology and an algorithm that can assist the internetworking different standards are presented. A cross standard scenario is simulated and results are explained.
The novel proposed method as a combination of Time Division Multiple Access (TDMA) and Orthogonal Frequency Division Multiple Access (OFDMA) called Orthogonal Frequency Division Most Congested Access First (OFDMCAF) provides spectrum sharing, buffer management and improves the throughput. In this work the power consumed by activating each cognitive method is analyzed in addition to the throughput...
In the last few years, demand for high-speed internet access and multimedia service has increased greatly. The IEEE 802.16 standard defines the wireless broadband access technology called WiMAX (Worldwide Interoperability Microwave Access) aims to provide broadband wireless last-mile access, easy deployment, high speed data rate for large spanning area. In this paper, we propose an Energy/bit Minimization...
This paper studies OFDMA resource allocation for QoS provision in hybrid wireless network, which includes an infrastructure based cellular network and many ad-hoc nodes. The base station has to consider not only those cellular nodes with direct links but also ad-hoc nodes with multihop connectivity. We formulate the optimization problem to maximize the overall throughput, while satisfying the individual...
The amendment of 802.16e has been released lately by IEEE 802.16 Relay Task Group j. For the sake of improving throughput and extension of cell coverage, relay stations (RSs) are deployed in the network. Intuitively, the base station (BS) selects a path for a target subscriber station (SS) according to Signal to Interference plus Noise Ratio (SINR) or the available bandwidth. However, it will lead...
WiMax mesh network provides a mechanism for creating multi-hop mesh, which can be deployed as high speed wide area wireless network. The routing and scheduling are two key factors that influence the performance of the WiMax mesh networks. In this paper, we introduce cross-layer design scheme and take both routing and scheduling into account in order to improve the performance. A centralized scheduling...
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.