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Physical-layer network coding is a high-throughput technique for communicating over the two-way relay channel, which consists of two terminals that communicate exclusively via an intermediate relay. An exchange of messages begins with both terminals transmitting binary data sequences simultaneously to the relay. The relay determines the modulo-2 sum of the sequences, which it modulates and broadcasts...
Future military operations will feature network-enabled human soldiers working seamlessly with intelligent, autonomous systems such as sensor networks and unmanned vehicles. In these systems, data aggregation (e.g., data fusion, plan monitoring) and data dissemination (e.g., information sharing) will be essential communication patterns. While ad hoc networks are commonly proposed for complex battlefield...
Multicasting can be an useful service in wireless mesh networks (WMNs), which have gained significant acceptance in recent years due to their potentials of providing a low-cost wireless backhaul service to mobile clients. Many applications in WMNs require efficient and reliable multicast communication, i.e., with high delivery ratio but with less overhead, among a group of recipients. However, in...
Relay network is proposed as a means of improving the error performance and energy efficiency of the wireless networks. Inspired by the battery power efficiency (BPE) analysis in Duan et al. (2009), relay selection from the battery energy efficiency perspective turns out to be an interesting topic. Under the general network setup which integrates typical transmission and reception modules, we adopt...
Cooperative hybrid-ARQ (HARQ) protocols have been widely studied because they are more efficient than cooperative protocols without HARQ. In, the throughput of a cooperative HARQ protocol based on the decode-and-forward protocol (DF-HARQ) is obtained. In this paper, the maximum achievable throughput of the DF-HARQ protocol is obtained using the asymptotic outage probability when the maximum number...
The opportunistic large array (OLA) with transmission threshold (OLA-T) is a simple form of cooperative transmission that limits node participation in broadcasts. Performance of OLA-T has been studied for disc-shaped networks. This paper analyzes OLA-T for strip-shaped networks. The results also apply to arbitrarily shaped networks that have previously limited node participation to a strip. The analytical...
To support highly flexible network mobility in mobile communication systems, various types of movable network entities, especially mobile base stations (M-BSs), will appear in near future. In this environment, a scanning process to identify the availability of neighbor M-BSs for handoff should be newly designed, because a conventional method does not reflect the motion of base stations. Therefore,...
This paper investigates the energy-bandwidth trade-off of various relaying strategies over the AWGN channel. The total energy consumption per information bit includes the receiver circuit processing energy at the relay and destination as well as the transmitted energy. With the cooperation of the source and relay, the end-to-end bandwidth efficiency can be improved at the cost of receiver processing...
This work describes an analysis of applying different election heuristics to connected dominated set (CDS) algorithms within different topological graph taxonomies. Our initial motivation for this study was a general observation that a significant amount of research in mobile ad hoc network (MANET) algorithm design and related election heuristic evaluation is based upon geometric random or other types...
Relay networks have attracted a lot of attention for their potential to increase spatial diversity. However, limited attention has been paid to practical detector design and implementation issues. In this paper, we investigate the design of maximum-likelihood detectors for half-duplex amplify-and-forward relay networks in intersymbol interference (ISI) channels. In particular, we study the case when...
We study the use of node cooperation as a way to improve performance in multiple-source, single-destination wireless networks that use scheduled access as the channel-access method. Unlike many other studies of scheduled access, which are based on the use of a collision channel, we use a physical channel model that incorporates other-user interference, fading, and background noise. The characteristics...
We propose a new class of message routing schemes for mobile wireless networks with intermittent network connectivity. The proposed schemes are based on swarm intelligence (SI) and exploit the statistical properties of time-varying network connectivity for opportunistic message forwarding. We also consider a special form of our proposed schemes which can be viewed as a marriage between the SI and...
Cooperative relaying has been proposed as a promising technology to provide reliable high data rate services for future wireless networks. The work presented here focuses on a novel efficient three time-slot approach using rateless codes, opportunistic fountain (OF), for cellular networks with fixed relays. This scheme enjoys benefits from both relay selection and inter-relay cooperation, offering...
In wireless sensor networks (WSNs) energy is a scarce resource which must be utilized efficiently in order to enhance the network lifetime. Two-tiered wireless sensor network (TT-WSN) architecture is proposed to improve the lifetime longevity of the network. In TT-WSN the lower tier consists of sensor nodes (SN), which are mainly responsible for sensing the environment and forwarding the data to its...
The problem of anonymous wireless networking is considered when adversaries who monitor the transmissions in the network are also capable of compromising a fraction of nodes to extract network information. For a given level of network performance, as measured by network throughput, the problem of maximizing anonymity is studied from a game-theoretic perspective. The metric of anonymity considered...
In this paper, we investigate the information theoretical performance of a cooperative OFDM (orthogonal frequency division multiplexing) system with imperfect channel estimation. Assuming the deployment of a training-aided channel estimator, we derive a lower bound on the achievable rate for the cooperative OFDM system with amplify-and-forward relaying over frequency-selective Rayleigh fading channels...
In this paper, we explore the advantages of network coding and space-time coding in improving the performance of two-way relay channel communications where two terminals absent of direct link exchange information through a single relay in between. Network coding allows embracing interference from other terminals thereby turning it into a capacity boost. Application of space-time codes yields higher...
We study the impact of different levels of relay cooperation on the throughput of a two-hop amplify-and-forward relaying network, where n single-antenna source-destination pairs communicate through a set of single-antenna relays. We focus on two levels of cooperation among the relay nodes, where the relays share either channel state information (CSI) or both CSI and received signals. The high level...
With the proliferation of network management tools that adjust link and path characteristics to optimize network performance and health, TCP's are frequently incorporating path characteristic detection mechanisms to quickly adapt to the effects of these changes. Optimal TCP performance, including rapid adaptability, depends on, among other things, an accurate view of the of the bandwidth-delay product...
This paper considers a two-way amplify-and-forward (AF) relay network, where two users communicate with each other through an intermediate relay over asymmetric Nakagami-m channels. The average bit-error rate (BER) performance is analyzed for the relay under average power scaling (APS) and instantaneous power scaling (IPS) constraints. We demonstrate that this network operating in two time slots not...
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