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.
MIMO based MANET has received a great deal of attention in the past decade, resulting in a number of MAC layer protocols that aim to utilize the inherent capabilities afforded by multi-antenna enabled nodes. Many of these MAC protocols look to improve on the total number of concurrent links within the network. In this paper, we present a theoretical approach for identifying the maximum number of concurrent...
The DVB-RCS standard provides a framework for Multi-Frequency TDMA (MF-TDMA) and dynamic resource (frequencies and time slots) allocation over satellite links. Nevertheless, MF-TDMA and dynamic resource allocation alone are not sufficient to achieve satisfactory throughput for TCP, the dominant transport protocol in IP-based networks such as the Global Information Grid (GIG) system, due to the inherent...
As wireless systems continue to proliferate, interference management is becoming a concern in both military and commercial domains. This paper introduces a novel cognitive coexistence framework between infrastructure and ad hoc networks. Based on sensing and predicting the ad-hoc networkpsilas activity, the infrastructure system allocates power and transmission time such as to minimize its impact...
Game theory is a useful tool that can be used to study the distributed resource allocation problem, since each node in the network tries to maximize his own payoff and hence a need to resolve their conflicting interests. In this paper, we introduce utility functions so that the strategy set of each node allows no transmission. We incorporate the effect of interference a node is causing to the surroundings...
Multi-Frequency Time-Division (MF-TDMA) techniques allow a large community of users to share bandwidth efficiently. Resources can be allocated based on user demands and user capabilities. The resources allocated to each individual user must be packed together in the spectrum available to the system while maintaining certain constraints based on user capabilities. Increasing the resource packing efficiency...
We consider a new inference-centric application for a distributed sensor network. Consider multiple signal sources, i.e., acoustic sources, in the field being monitored. Governed by physics law each sensorpsilas measurement can be modeled as a linear combination of the original multiple signal sources, corrupted by the additive measurement noise. In a non-cooperative communication scenario, each sensor...
Multi-mode power loading is an attractive power loading technique since it avoids iterative procedures and periodic updates of a threshold value in order to find the best power loading configuration. Simultaneously, multi-mode power loading achieves comparable spectral efficiency to optimal waterfilling with full channel state information (CSI) using only N feedback bits, where N is the number of...
In this paper, we investigate scheduling for information management and dissemination in a multi-mission network. Dynamic network resource scheduling plays a crucial role in tracking critical engagement in battlefield and thus is highly demanded in multi-mission systems. Our focus is on how to resolve bandwidth contention in a heavily loaded network where mission requests surpass available bandwidth...
This paper addresses the adaptive allocation of subcarrier, bit and power resources in the downlink of multicell OFDMA systems, where base stations allocate radio resources in a decentralized manner. Our algorithm uses discrete bit-loading values which is more applicable to the practical systems. Noncooperative game theoretic approach is adopted and we first only include the transmit power and throughput...
Cooperative diversity is a form of distributed spatial diversity achieved by cooperative communication among mobile users in cellular or wireless data networks. The problem of selecting suitable partners for a cooperative strategy is more complex when prospective partners have links of dissimilar quality to a central destination, leading to the possibility of non-reciprocal cooperation. We analyze...
A relay station (RS) in IEEE 802.16j mobile multi-hop relay (MMR) networks provides access links to far-off subscriber stations (SSs) and hidden subscriber stations. The RS also relays data from a base station and other RSs while maintaining backward compatibility with legacy subscriber stations in existing IEEE 802.16 networks. Much research is being performed to finalize the standard; however, how...
The integrated waveform (DAMA UHF SATCOM), specified in MIL-STD-188-181C/182B/183B/185A, defines a TDMA communication system in an attempt to improve satellite bandwidth utilization over legacy SATCOM waveforms. To overcome some of the limitations of statically defined user communications (UCOM) services in MILSTD-188-183A, the flexibility to assign services nearly anywhere within a frame was introduced...
In 2008, the French MoD has started an experimental SATCOM network which aims at using EHF resources (44/21 GHz) in an efficient manner. It will lead to an operational use of this frequency band in order to cope with the lack of SHF frequency resources. Contrary to the SHF concept of use where links are planned with constant data rates and static margins, the EHF band requires the use of fading mitigation...
This paper presents optimal channel assignment algorithms to maximize the unicast network capacity of large scale multi-channel, multi-radio, multi-hop static wireless networks under the Arbitrary Network model and the Random Network model, respectively. The network capacities are approximated by the network capacity bounds derived in the literature and the optimization problems are formulated and...
Layer 2 radio resource allocation schemes being used in mobile ad hoc networks (MANET) do not always take into account the quality of service (QoS) requirements of network traffic. As an example, the current USAP (unifying slot assignment protocol) slot allocation scheme is QoS-unaware. Consequently the scheme could grant available slots to lower priority traffic instead of higher priority traffic...
Indoor wireless communication systems have been developed to improve cell coverage and throughput with low cost in indoor environment. Among several indoor wireless communication systems such as mobile WiMAX (worldwide interoperability for microwave access) system, WPAN (wireless personal area network) and WLAN (wireless local area network), the mobile WiMAX is one of the promising next-generation...
We consider the problem of sensor-mission assignment as that of allocating a collection of intelligence, surveillance and reconnaissance (ISR) assets (including sensors and sensor platforms) to a set of mission tasks in an attempt to satisfy the ISR requirements of those tasks. This problem is exacerbated in a coalition context because the full range of possible ISR solutions is not easy to obtain...
Consider a two-user fading cooperative multiple-access channel (CMAC), where each user, along with transmitting its own information to the destination, helps the other user by forwarding the latterpsilas information. It is assumed that the transceivers (nodes) are capable of half-duplex communication and that full channel state information (CSI) is available at all the nodes. Cooperative transmission...
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.