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There is a need for military and commercial wireless radio networks that can operate in dynamic environments while supporting high spectral efficiency with throughput guarantees and low latency. This is particularly challenging in wireless mobile ad-hoc networks (MANET). Multiuser detection (MUD) technology promises to address these needs. But most research in MUD technology to date has focused on...
In wireless heterogeneous environment, the integration of wireless access network will be accomplished by seamless handover which contains many challenges i.e. service mobility, vertical handover, common authentication, unified accounting/billing, security mechanisms, QoS and service provisioning, etc. Toward this direction, our research aims to provide a complete integration of heterogeneous network...
For large cooperative wireless networks where direct links are limited in the neighbors of each node, we develop a diffusion automatic repeat request (ARQ) protocol based on selection cooperation. The number of potential relays for selection increases as the ARQ process continues and even the nodes that have no direct link with the source could cooperate with it. We analyze the diversity-multiplexing-delay...
In this paper, channel allocation scheme is studied for overlay wireless networks to optimize connection-level QoS. The contributions of our work are threefold. First, channel allocation scheme using both horizontal channel borrowing and vertical channel borrowing is presented and analyzed. Channel borrowing is restricted within handoff requests, and only predefined channels can be lent. When all...
In this paper, we study power allocation strategy of the cognitive radio (CR) system. In a CR system the user has different channel condition. So, different amount of power resource is required to meets the QoS request. In order to guarantee the fairness of each CR user and limit the interference that is caused by CR users within the range into the level that primary user can tolerate, we proposed...
OFDM-based communication systems have been widely used in several wireless network applications. In order to achieve a more efficient resource allocation, an novel bit and power allocation algorithm with lifetime consideration is proposed. In this work, the lifetime is specified by the portion of power or energy that a particular user can enjoy during the entire transmission. The proposed algorithm...
Video compression and streaming over lossy wireless networks is the current trend in telecommunication and encouraged by major carriers to increase their services portfolio. However, the technological challenges are still tackled to enable the delivery of high quality video. In our previous work, we developed a per stream distortion model that is based on the extended Gilbert model. We expanded our...
The exponential growth of wireless technologies attracted many research to improve the quality of service (QoS) of global wireless networks such as 802.11 and 802.16. In specific, research targeted the physical layer (PHY) parameters and medium access control (MAC) mechanisms to improve QoS. In this paper we provide a simple yet efficient model to maintain the quality of service for wireless networks...
This paper proposes a new scheduling algorithm for IEEE 802.16-2005 Broadband Wireless Metropolitan Area Networks in TDD mode. The proposed algorithm focuses on solving the problem of handling high priority traffic in congested networks while minimizing starvation conditions for other served classes. In this work, a detailed simulation study is carried out for the proposed scheduling algorithm as...
The growing problem of spectrum scarcity and the inefficient spectrum utilization in the licensed bands, are addressed by the emerging Cognitive Radio (CR) paradigm. It is seen that the choice of the spectrum bands, called as spectrum decision, must be organized carefully by considering the challenges in the spectrum availability over time, the short term fluctuations in the availability, and the...
Game theory provides an adequate methodology for analyzing topics in communication systems that include trade-offs such as the subject of load balancing. As a means of balancing the load in the network, users are handed over from highly loaded cells to lower loaded neighbors increasing the capacity usage and the Quality of Service (QoS). The algorithm that calculates the amount of the load that each...
The following topics are dealt with: optical network; quality of service; telecommunication network management; network security; generation network routing; network planning; and wireless network.
Cognitive Radio Networks (CRNs) deal with opportunistic spectrum access in order to fully utilize the scarce of spectrum resources, with the development of cognitive radio technologies to greater utilization of the spectrum. Now-a-days Cognitive Radio (CR) is a promising concept for improving the utilization of limited radio spectrum resources for future wireless communications and mobile computing...
The communication of video streams over wireless not only requires the stability of channel but also needs stringent QoS (quality-of-service) constraints, such as low packet loss and latency. Therefore, radio resource allocation for different traffic becomes one of the major challenges in designing a wireless multimedia network. In this paper, a priority-based cross-layer QoS scheme for wireless channel...
In order to ensure the safety of the running train, wireless communication system for train communications and control must provide a network with high quality of service (QoS). And wireless network design will directly influence the performance of the whole network. In the process of the network design, choosing the appropriate prediction model, predicting the coverage, and determining base station...
Allusion to the various different requirements QoS's quota such as delay sensitivity of multi-medium business for Multi-media communication in Heterogeneous wireless network, we put forward the attemper arithmetic of classify queue based on multi-medium communication. Grade the now operation according to the factors of flux, delay and error tolerance etc, and the node that participates transmission...
The bandwidth in wireless networks is usually shared by a number of wireless nodes. The channel capacity depends on the number of accessing nodes, time, environmental conditions and location of nodes. Due to varying channel conditions, several issues are observed in the transmission of real time multimedia. The existing research on multimedia streaming can be classified into adaptation techniques...
The statistical behavior of wireless medium access can generally be described by a function that relates the offered traffic to the collision probability and delay. Given a maximum tolerable collision probability and/or delay (quality-of-service constraints), one can derive the maximum admissible offered traffic for a given medium access strategy. In this paper, we describe both a centralized as well...
This paper studies the performance of coherent and noncoherent code alignment detectors in the uplink of a flat-fading CDMA wireless network. A distributed resource allocation scheme in which each pair transmitter-receiver can set its own transmit power and detection threshold is considered to maximize the probability of code detection per consumed energy at the transmitter under a constraint on the...
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