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Millimeter wave (mmWave) communications systems are promising candidate to support extremely high data rate services in future wireless networks. MmWave communications exhibit high penetration loss (blockage) and require directional transmissions to compensate for severe channel attenuations and for high noise powers. When blockage occurs, there are at least two simple prominent options: 1) switching...
As one of the significant driving forces of the future broadband heterogeneous networks (5G), the Next Generation WLAN (NGW) has been initiated following the 802.11 HEW (High-Efficiency WLAN) study group with a focus on improving spectrum efficiency and area throughput. However, Low-Rate-Links (LRLs) severely degrade the overall wireless network performance, particularly under the dense environments...
This paper considers an orthogonal frequency division multiplexing (OFDM) based two-way cognitive radio (CR) multiuser multiple relay network. The target is to jointly solve the problem of power allocation, subcarrier assignment, selection of best relay/s, and the sub-carrier pairing at the relay nodes. The aim of the optimization is to maximize the end-to-end sum rate of the network under exclusive...
As one of the significant driving forces of the future broadband heterogeneous networks (5G), the Next Generation WLAN (NGW) has been initiated following the 802.11 HEW (High-Efficiency WLAN) study group with a focus on improving spectrum efficiency and area throughput. However, Low-Rate-Links (LRLs) severely degrade the overall wireless network performance, particularly under the dense environments...
Joint processing coordinated multipoint (JP-CoMP) is a new technology in LTE-A adopted to enhance the throughput of cell edge users as well as to mitigate interference. Relay Nodes (RNs) have also proven useful toward the realization of LTE-A, in improving the signal quality for the cell edge users. In this paper, we propose to combine JP-CoMP and relaying techniques for further improvements at the...
Aiming at uninterrupted sensor network, we consider a radio frequency (RF) harvesting cooperative communication scenario, where the field nodes (information sources) are powered by RF energy transfer (RFET) from a relay. The relay node can be either connected to the power grid or positioned at some ambient energy harvesting favorable location for the desired energy supply. To further reduce the field...
The benefits of network layer cooperation cognitiveradio networks have been gradually recognized in recent years. In this paper we consider the network layer cooperation incognitive radio network, whereby primary users select somesecondary users to relay packets, in return for more favourablespectrum access rules for secondary users. Under this cooperationscheme, we investigate how to enlarge the...
Under water sensor networks(UWSNs) have attracted significantly to explore natural and undersea resources and gathering scientific data in aqueous conditions. The adverse characteristics in UWSNs communication and high cost limit the sensor nodes to spare deployment, causing delay, low propagation, power efficiency and floating node mobility. This proposed protocol is developed to handle these problems...
As an important part of intelligent transportation system, vehicle ad-hoc network technology is being concerned by more and more people. As one of the key technology of vehicle ad-hoc network, media access control technology determines how the vehicle nodes use the limited wireless channel resources, which has important influence on the performance of vehicle ad-hoc network. In order to make good...
Underwater Acoustic Sensor Networks are considered to provide efficient monitoring tasks in aquatic environment but due to limited battery resource of sensor nodes, network lifetime collapses. Energy balancing is the major issue in low network lifetime. High energy consumption creates energy holes and ultimately leads to shorter network lifetime. Therefore, energy consumption must be balanced to increase...
We present in this paper a MAC layer protocol capable to cope with lossy links in interference-prone wireless environments. Our approach exploits the recent advances in information theory and physical layer coding by relaying at intermediate nodes corrupted messages. To do so, we rely on collaboration between nodes and on a complete rethinking of the header structures and wireless access techniques...
Spectrum scarcity is one of the primary bottlenecks for the future wireless communication systems, for better spectrum utilization cognitive radio plays a vital role. Cognitive radio is a new paradigm of designing wireless communications systems which aims to enhance the utilization of the radio frequency (RF) spectrum for wireless communications. Available spectrum bands may vary with different cognitive...
In this work, a cooperative scenario of cognitive network is considered to maximize the energy efficiency and throughput while maintaining certain boundary conditions like, probability of detection threshold and total power budget allocation. After evaluation of the mathematical form, simulation is done on the basis of relay amplifying factor. Additionally, the optimal level of relay amplifying factor...
Nowadays the concept of the Internet of Things (IoT) becomes more and more popular. However, state-of-the-art wireless technologies do not meet the IoT requirements for low power consumption and big number of simultaneously connected devices. To meet IoT requirements, IEEE 802.11 Working Group is developing a new low-power long-range Wi-Fi, called HaLow, which is described in the new IEEE 802.11ah...
In this paper, we propose the Adaptive Network Coding (ANC) mechanism for multi-hop wireless networks. The ANC mechanism takes an adaptive approach to the network coding-based forwarding and focuses on improving the robustness and the reliability of the network in the unreliable wireless environment. This paper introduces the Neighbor's Overhearing Link quality Measurement (NOLM) which allows the...
Most existing mobile ad hoc network (MANET) routing protocols use the minimum number of hops as a routing metric. These paths tend to contain long range links that may degrade both throughput and reliability. Higher throughput can be achieved by using short but effective links. The main problem with existing protocols is that they use only receiver signal strength indicator (RSSI) value to assess...
We propose a secure transmission scheme for a relay wiretap channel, where a source communicates with a destination via a decode-and- forward relay in the presence of spatially random- distributed eavesdroppers. We assume that the source is equipped with multiple antennas, whereas the relay, the destination, and the eavesdroppers are equipped with a single antenna each. In the proposed scheme, in...
In this paper, a MAC-layer protocol for mobile ad hoc networks called Assistant Nodes Time Division Multiple Access (ANTDMA) is proposed. ANTDMA is based on multichannel transmitting and assistant node. Multiple channels can increase spatial reuse and decrease delay and collision during transmitting. Meanwhile, with the help of assistant nodes, ANTDMA not only has a large throughput, but also becomes...
In this paper, we investigate the throughput maximizing problem for a classic three-node relay communication system with a receive-and-forward relay node, which is able to harvest energy from the nature using a rechargeable battery. Besides of the energy consumption for reforwarding the received data, the energy for receiving data at the relay node is also considered. The objective is to maximize...
We investigate the joint resource allocation problem for both downlink and uplink transmissions in a wireless-powered sensor network. Cooperation among the sensor nodes is considered in the uplink to overcome the performance loss of the sensor nodes that are far from the access point. Since the joint optimization problem of power and subcarrier allocation and relay selection is mixed-integer nonlinear,...
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