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Wireless communication has been rapidly developed in recent years acquiring higher demand of efficient wireless systems. Cooperative communication is considered to be capable of effectively meeting this rapid growth where the use of relays improves the throughput and ensures successful transmission to all terminals in a given system. In this paper, a Two-way Decode and Forward Relaying for orthogonal...
One of the promising enhanced features introduced in LTE-Advanced is relaying. Coverage extensions as well as enhanced throughput gain are attractive from the perspective of network operators. While functioning in the macro-overlaid network, relay offers the flexibility of random deployment (nomadic relay) at places where the communication link is congested due to an occasional event (e.g. festival)...
Radio energy harvesting model is an another method to extend the lifetime of wireless networks. In this paper, an energy harvesting model is given for amply-and-forward relay networks with aiding of ambient interferences. For this reason, the energy constrained relays harvest energy from the received signal and then use that harvested energy to amply and send that signal to the target. A time switching...
While trying to get a service from the Base station it happens that many devices will find themselves competing to get the cellular service, which means each device will use the maximum power possible to win the competition, but if there is another solution that will allow the device to get what it wanted with minimum of energy, how the device will react to it? In other words, we know that the communication...
Millimeter wave (mmWave) communication is a key enabling technology for 5G cellular systems. However, due to mmWave propagation characteristics, link length for very high rates is limited and will likely necessitate the use of relay nodes for longer-range ultra-high-speed backhaul communications. This paper investigates relay selection and scheduling to support high end-to-end throughput in mmWave...
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...
Energy harvesting has been gaining a lot of attention in the past decade due to its ability to provide a-virtually-endless energy supply. Nodes in a Wireless Powered Communication Network (WPCN) depend, totally or partially, on the energy harvested from the Central Node (CN) which has a constant power supply. This work addresses a solution to the problem of lack of fairness in the distribution of...
In this paper, the throughput maximization problem is investigated for a block fading buffer-aided relay channel. The decode-and-forward (DF) relaying scheme is adopted, and the buffers at the relay can temporarily store the data received from the source. Considering the non-ideal circuit power, one of three transmission modes (source transmission, relay transmission, and keeping silence) is selected...
Simultaneous wireless information and power transfer (SWIPT) is an effective way for energy-constrained unmanned aerial vehicle (UAV) to prolong the network lifetime. In this paper, an amplify and forward (AF) relaying network is considered, where an energy-constrained UAV harvests energy and information simultaneously from base station and then transmits the information to the destination node. Based...
The decode-and-forward (DF) relay based cellular network is considered an efficient technique for solving the coverage and improving system capacity of the current fourth-generation (4G) and the emerging fifth-generation (5G) mobile telecommunication technologies. In this analysis, we control the codeword's transmission parameters by achieving a good trade-off between setting more resources with changing...
In this study, the resource blocks (RB) are allocated to user equipment (UE) according to the evolutional algorithms for long term evolution (LTE) systems. Particle Swarm Optimization (PSO) algorithm is one of the evolutionary algorithms, based on the imitation of a flock of birds foraging behavior through learning and grouping the best experience. Therefore, we propose a Simple Particle Swarm Optimization...
The connectivity in wireless communication is established based on the receiving signal strength, which is affected by distance, interference, noise, mobility, etc. As a result, a node has a limited coverage area. Therefore, the connectivity becomes one of the significant limitations in multi-hop wireless networks. The relaying concept and transmission power control were introduced to overcome the...
In this paper, we propose a cross-layer design framework for transmitting Markov modulated Poisson process (MMPP) traffic over cognitive cooperative networks, which considers the energy efficient transmissions for different delay-aware packets. The adaptive modulation and coding (AMC) is used in the cooperative transmission system. The queueing process is considered in the buffer aided relay and source...
This paper investigates the link selection policy for secure communications over a buffer-aided two-hop communication link. It is assumed that a source wishes to send information to a destination with the aid of a trusted half-duplex relay node compromised by a passive eavesdropper, and that there is no direct link between the source and the destination. The buffer-aided relay forwards the information...
The robots having 3G/LTE capability can cooperate with others by using link-aggregation when one needs to send unexpected huge data in high bandwidth to the remote center office. To do so, the robot distributes its data to other robots with IEEE802.11 WLAN. They can move close to the robot to prevent from the situation where the WLAN communication becomes a bottleneck because they are too far to get...
Cognitive radio (CR) is an effective way to improve the utilization of spectrum resource. This paper focuses on the resource allocation in cooperative relay cognitive radio networks and proposes an optimized resource allocation algorithm. In the algorithm, when the channel between the primary source and destination is good, the primary user (PU) selects a best sub-channel to transmit its data directly,...
This paper proposes Raptor codes-structured wireless super-dense networks serving a massive number of users with passive nodes constructing a precode of Raptor codes for future wireless networks. Passive nodes do not have their own information and only forward information from the neighboring nodes to the destination node. Similar to the capability of precode of Raptor coding scheme to protect information...
Queuing Theory was ultimately applied to improve the radio resource sharing in cooperative cognitive radio networks. It indeed gives a better model of storing and transmitting packets of both Primary User (PU) and Secondary User (SU). It especially helps emulate the cooperative radio resource sharing between these two users. With such cooperation protocols, the PU allows the SU to share his spectrum;...
Due to the expected exponential growth of traffic volume in 5G-based networks, efficient mechanisms that effectively utilize the underutilized portion of wireless spectrum are needed. Opportunistic spectrum access mechanisms are designed to utilize the available licensed spectrum bands, which can be granted to unlicensed users (secondary users (SUs)) without causing harmful interference to licensed...
In recent days wireless network provides a high bandwidth support eternally for enabling a loss free communication. One amongst the standards available for high rate support in personal area network is WiMedia Ultrawideband. It provides consumer applications and products at low price consuming low energy. An effective slot allocation and scheduling method could enhance the performance of the existing...
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