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Data transmission capacity of ad-hoc wireless networks could be increased by using multi-path transmission and minimising mutual interference between nodes. This approach could also be used to extend D2D communication opportunities in 5G. The objective of this paper is theoretical analysis and computer simulation to reveal the best conditions for combining smart antennas and multi-path transmission...
The applications for MANETs have increased rapidly and today MANETs are capable of providing a variety of services. One of the major contributing factors is the availability of radios that are able to adapt to the channel conditions and can transmit at multiple data rates. A common approach for channel access is to employ a CSMA/CA based mechanism. However, these protocols tend to under perform at...
To mitigate performance anomalies due to different transmission rates and to improve throughput performance in ad-hoc networks, a previous work has proposed a new method called user cooperative mobility. It also showed that the method achieved good improvement when users appropriately move. However, it only employed theoretical evaluation which does not include detailed behavior such as capture effect...
Demand for ad-hoc networks is increasing so it is expected ad-hoc networks will exist in close proximity in the future. A contention window control method, ACWA, which improves throughput of ad-hoc network against radio interference has been recently proposed. However unfairness of throughput between ACWA and DCF might be caused. We propose a modified ACWA method (GSAR scheme) which drastically improves...
Mobile ad-hoc networks (MANET) are of particular importance in military communications. With the trend towards higher throughput requirements and spectrum congestion, researchers have looked at using multi-antenna techniques to enable concurrent transmissions within a one-hop MANET. However, the acquisition overhead has been shown to be a problem when dealing with concurrent transmission in MANET...
Recently, cooperative communication has been used as a cost effective alternative to traditional MIMO systems. Even though cooperative relaying at the physical and/or MAC layer improves the performance of the network, it increases the level of interference in a multihop wireless network. In a multihop wireless adhoc network, the amount of interference created can be reduced by using power control...
The transmission capacity of WL-MANET (one kinds of wireless mobile local area network that consists of ad hoc nodes) is constrained by the mutual interference of concurrent transmissions among ad hoc nodes. We study a graph theory strategy and the impact to transmission capacity by the interference between the ad hoc nodes, and present methods for computing the transmission capacity for the given...
Device-to-device (D2D) communications and open-access small cells can be leveraged to off-load delay-insensitive and cost-sensitive data from burdened cellular networks. The resulted system is called hybrid wireless networks, whose capacity and delay performance have been studied extensively under a popular information-theoretic framework called scaling law analysis. Most studies, however, do not...
Information dissemination protocols for ad-hoc wireless networks frequently use a minimal subset of the available communication links, defining a rooted Broadcast Tree. In this work, we focus on the core challenge of disseminating from one layer to the next one of such tree. We call this problem Layer Dissemination. We study Layer Dissemination under a generalized model of interference, called Affectance...
This paper presents a mobility-aware channel allocation strategy for clustered ad hoc network. Our main novelty is to consider the mobility associated with the number of times that the channel with larger spectral distance is allocated to guide the channel allocation process, while quickly responding to changes in the network topology. In our performance evaluation, we use a realistic mobility model...
Vehicular ad-hoc networks (VANETs), as an important component of intelligent transportation systems (ITS), have been attracting more and more research interests for their various promising applications. Although various MAC protocols have been proposed, efficient medium access remains a significant challenge in VANETs, especially in improving the network throughput in heavy traffic vehicular networks...
The fifth generation (5G) networks employing millimeter wave (mmwave) technology will gain the advantages of short distance directive propagation and more spectrum for communication. Device-to-Device communication (D2D) when integrated with mmWave technology can reach the demand for high capacity. In this paper, resource allocation for underlay D2D in outdoor mmWave scenario is presented. We emphasize...
Cognitive radio ad hoc networks (CRAHNs) emerge as a spectrum efficient networking technology to enable autonomous machine-to-machine communication among massive number of IoT devices. However, spectrum sharing results in opportunistic links and CRAHN becomes a kind of opportunistic networks. To reduce latency in CRAHN and to achieve overall spectrum efficiency by avoiding tremendous feedback signaling,...
In this paper, we propose a high order cumulants based spectrum sensing and power recognition (CSR) detector for hybrid interweave-underlay spectrum access, where the primary system is with multiple transmit power levels. Specifically, to detect the idle spectrum when primary user (PU) is absent, high order cumulants based spectrum sensing is performed in interweave model. When PU is detected, the...
With the large growth of the Internet of Things (IoT), a strong focus has been put on designing and developing energy efficient and high performance protocols. Industrial-type wireless networks require strict and on-time delivery guarantees, such as close to 100% network reliability and ultra low delay. To this aim, standards such as IEEE 802.15.4-TSCH or Wireless HART, aim to guarantee high-level...
With the development of wireless networks, the scale of network optimization problems is growing correspondingly. While algorithms have been designed to reduce complexity in solving these problems under given size, the approach of directly reducing the size of problem has not received much attention. This motivates us to investigate an innovative approach to reduce problem scale while maintaining...
In this paper, we investigate the uplink transmission performance of low-power wide-area networks (LPWANs) with regards to coexisting radio modules using LoRa as an example. In doing so we adopt a new topology to model the network where the node locations of the network of focus (LoRa) follow a Poisson cluster process (PCP) while other coexisting interfering radio modules follow a Poisson point process...
Localization in Industrial Wireless Sensor Networks (IWSNs) promotes innovations in manufacturing applications, such as structural status mapping, instrument fault diagnosing and oriented automation system associating. However, dispersive distortion, impulse noise and interference effects causing unpredictable and time-variant effects of the signal, decrease the localization accuracy in harsh manufacturing...
Device to device (D2D) communication is essential in Internet of things (IoT). Cognitive radio (CR)-enabled device is a promising technique to address D2D communications. Among all the functions supported in IoT, priority-based spectrum access is less investigated yet urgently desired in IoT. An important operation to achieve this capacity is channel hopping (CH) based rendezvous which allows two...
In this paper, the problem of cross-layer design of the link scheduling and flow control is studied in hybrid terrestrial-satellite wireless backhauling network. Considering network limitations and requirements, the target is to minimize the traffic delivery time by deciding the active backhauling links that can transmit simultaneously. Additionally, the proposed scheme provides a way to utilize the...
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