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In this paper, we study a coalitional game approach to resource allocation in a multi-channel cooperative cognitive radio network with multiple primary users (PUs) and secondary users (SUs). We propose to form the grand coalition by grouping all PUs and SUs in a set, where each PU can lease its spectrum to all SUs in a time-division manner while the SUs in return help the data transmission of PUs...
A coding scheme based on irregular low-density parity-check (LDPC) codes is proposed to send secret messages from a source over the Gaussian wiretap channel to a destination in the presence of a wiretapper, with the restriction that the source can send only binary phase-shift-keyed (BPSK) symbols. The secrecy performance of the proposed coding scheme is measured by the secret message rate through...
A Gaussian multiple-input multiple-output (MIMO) wiretap channel model is considered, where there exists a transmitter, a legitimate receiver and an eavesdropper each equipped with multiple antennas. The problem of finding the optimal input covariance matrix that achieves secrecy capacity subject to a power constraint is studied. In particular, it is shown that when the difference between the Grams...
For spectrum sensing in very low SNR regime, noise uncertainty (Nu), either arises from change of environment or hardware noise of a sensing device, could make proper setting of threshold difficult and therefore, is recognized as a challenge for achieving robust sensing. This paper proposes two smart threshold setting methods, called dynamic threshold selection (DTS) and realtime threshold setting...
To address the large latency and degraded network throughput due to the retransmission triggered by frame loss in high speed wireless networks, this paper proposes a solution called Frame Fountain that encodes and decodes data frames in the MAC layer. This solution intelligently encodes a number of redundant frames from original frames upon link loss rate so that a receiver can effectively recover...
A framework for rule-based multimedia network management in multihoming environment is presented. Information diversity with multiple criteria and semantic variations has led us to integrate the Multi Criteria Decision Making (MCDM) theory and Ontology over an all IP platform. MCDM helps in achieving the multiple objectives on the basis of multi-disciplinary information domains. The ontology, on the...
The domain of autonomic networking comes with its own set of architectural challenges and requirements that necessitates the knowledge of other domains like protocol design, system engineering and modern control theory for the design of autonomic behaviors. Thus, there is a need for an unified framework and methodology for designing the autonomic entities of such networks. A Model-driven framework...
Deep Packet Inspection (DPI) is a crucial tool that enables more accurate network management and traffic profiling. Its high computational demands have been pushing networking researchers to study how to improve DPI technologies. However, in this quest for better performance, little effort has been devoted to making fair performance comparisons among DPIs. Even worse, most studies show performance...
For a cooperative orthogonal frequency division multiple access (OFDMA) system with two transmitters (TXs), and full channel state information (CSI), we obtain the optimal power allocation (PA) policies which maximize the rate region achievable by a recently introduced version of block Markov superposition encoding (BMSE): inter-subchannel cooperative encoding (ISCE) [1]. We provide the optimality...
The growth in energy consumption followed with global warming provides new topics and issues in communication systems known as green radio. Hence, how to reduce power consumption while meeting system throughput requirement is an urgent task. In this paper, we investigate a new cooperative power allocation scheme for a multi-user orthogonal frequency division multiplex (OFDM) system, in which two coordinated...
In this paper, network coding is introduced in relay based MAC protocols for bidirectional traffic to evaluate the performance in terms of throughput and energy. The idea of proposed scheme is to use high data rate nodes to work as relays for the low data rate nodes and to achieve higher throughput and reduce the energy consumption. In addition, this scheme exploits the opportunity for two way communication...
Since the existing test method has drawbacks of long period, low efficiency, and non-repeatability, the advanced miniaturized testbed network is established to emulate the actual network for 3G/B3G systems. This paper focuses on the performance evaluation of the existing network and the advanced testbed network in statistic dimension and time dimension. Both the outfield testing and the system-level...
We present a geocast protocol for mobile ad hoc networks that selects the most statistically reliable path towards the geocast region. The novel aspect of our protocol is the attribution of network layer reliability to space, which enables reliability-aware geocast and provides soft delay guarantees. The proposed approach focuses on route reliability as the end-to-end metric and constructs a map of...
In this paper, we consider a cooperative multiuser wireless cellular system under multipath fading channels. All base stations (BSs) and mobile stations (MSs) are equipped with multiple antennas. The multiuser interference in such a system is inherently asynchronous due to different path distance of BS to MSs. Theoretically we can at best synchronize the desired signal component but not the interference...
In a multicell network with a frequency reuse-1, intercell interference (ICI) is a limiting factor. Especially cell edge users are subject to strong ICI. With beamforming the signal to interference plus noise ratio (SINR) of the cell edge users can be improved. Beside the interference of adjacent cells, cell edge users are often shadowed. In order to overcome this problem, relays in the cell edge...
In this paper, we consider how to optimally schedule packet transmissions from mobile devices over two network interfaces when uploading content files to the media cloud. Our design objective is to minimize total energy consumption while respecting a deterministic delay constraint. We present a convex optimization formulation of the problem, and show that it can be decoupled into two sequential sub-problems:...
In this paper, we focus on the use capillary M2M (Machine-to-Machine) networks for the estimation of spatial random fields. The observations (samples) collected by the sensors are spatially correlated and, for this reason, we propose to use a distributed pre-coding scheme based on the Karhunen-Loève (KL) transform. This allows us to obtain an over-the-air compressed representation of such set of observations...
We analyze the performance of MIMO multi-user dual hop relay network in the presence of antenna correlation. Orthogonal space time block coding (OSTBC) is used as the transmission scheme. By assuming multiple correlated antennas in all nodes, we derive the exact closed form solution for outage probability, average symbol error rate (SER) and ergodic capacity. Moreover, the performance of the system...
We consider the scenario of a sensing, computing and communicating infrastructure with a a programmable middleware that allows for quickly deploying different applications running on top of it so as to follow the changing ambient needs. We then face the problem of setting up the desired application in case of hundreds of nodes, which consists in identifying which actions should be performed by each...
Wireless mesh networks (WMN) are efficient and low cost solutions for the deployment of broadband access in various environments. To support real-time applications such as multimedia and emergency services, WMNs must provide quality of service (QoS) guarantees and QoS continuity protection. While the capacity of single radio WMNs may severely limit the QoS for such traffic, multiradio WMNs can overcome...
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