Frequency: Quarterly E- ISSN: 2277-8306 P- ISSN: 2349-3518 Abstracted/ Indexed in: Ulrich's International Periodical Directory, Google Scholar, SCIRUS, Genamics JournalSeek, EBSCO Information Services
Humanity has created too many things; and hence, calls for too many connections. When wired, the connections maze so much, engulfing a lot of visible space. The wireless provides the fluidity, and avoids the tangles of physical wires or network, but how does it affect filling the whole space with waves? "Inventi Impact: Wireless Communications & Networking" explores the technological advances being made in wireless technology and networking systems, their applications, and pros and cons. Research and review articles, patents and opinions, all are welcome.
In this paper an overview of Long Term Evolution (LTE) and Long Term Evolution-Advanced (LTE-A) is presented. It will offers superior experience to user and simplified technology for next generation mobile broadband. It provides ubiquitous coverage and roaming with existing 2G and 3G networks. Now day, mobile data traffic is expected to overtake voice traffic, which will place high requirements on mobile networks today and in the future.LTE, meets Next Generation Mobile Network’s (NGMN) requirements. Third Generation Partnership Project Long Term Evolution (3GPP LTE) aim to provide high performance services for mobile voice, video and data services at low cost deployments. LTE and LTE-Advanced technologies are candidates for the fourth generation (4G) mobile communication networks....
Fast-Than-Nyquist (FTN) transmission is a promising method to improve the\nspectrum efficiency for future wireless communication systems. However, this\nbenefit of FTN is at the price of inducing the inter-symbol interference (ISI),\nwhich increases the complexity of the receiver. In this paper, a circulated\nblock transmission scheme for FTN signaling, i.e. CB-FTN system is proposed.\nThe detail implementation structure of CB-FTN transceiver is presented,\nin which the ISI caused by FTN transmission is canceled by the frequency-\ndomain equalization (FDE), and the inter-block interference (IBI)\ncaused by the multi-path channel is overcome by the cyclic-prefix. The postprocessing\nsignal to noise ratio (pSNR) is analyzed for the CB-FTN receiver\nwith zero-forcing FDE in AWGN channel, which is verified by the simulation\nresults. Moreover, the BER performances and computational complexity of\nCB-FTN system are compared with the existed scheme....
Developing an effective cooperative spectrum sensing (CSS) scheme in cognitive radio (CR), which is considered as\r\npromising system for enhancing spectrum utilization, is necessary. In this paper, a cluster-based optimal selective CSS\r\nscheme is proposed for reducing reporting time and bandwidth while maintaining a certain level of sensing\r\nperformance. Clusters are organized based on the identification of primary signal signal-to-noise ratio value, and the\r\ncluster head in each cluster is dynamically chosen according to the sensing data qualities of CR users. The cluster\r\nsensing decision is made based on an optimal threshold for selective CSS which minimizes the probability of sensing\r\nerror. A parallel reporting mechanism based on frequency division is proposed to considerably reduce the time for\r\nreporting decision to fusion center of clusters. In the fusion center, the optimal Chair-Vashney rule is utilized to obtain\r\na high sensing performance based on the available cluster�s information....
In this paper, we present different types of technologies and their characteristics for underwater communication. With the world progressing with the speed of light, man has conquered the Earth, sky and now he has reached undersea to explore the world underneath. The underwater world presents us with many obstacles and complexities. The complexities include multipath fading, time variations, the motion of the water itself. The emerging technologies like Blue-Green Lasers are finding their ways to replace the conventional acoustic communication thus reducing their drawbacks....
Vehicular ad hoc networks (VANETs) are going to be an important communication infrastructure in our moving life.\nThe design of routing protocols in VANETs is a significant and necessary issue for supporting VANET-based applications.\nHowever, due to high mobility, frequent link disconnection, and uneven distribution of vehicles, it becomes quite\nchallenging to establish a robust route for delivering packets. This paper presents a connectivity-aware intersectionbased\nrouting (CAIR) protocol to address these problems by selecting an optimal route with higher probability of\nconnectivity and lower experienced delay; then, geographical forwarding based on position prediction is used to\ntransfer packets between any two intersections along the route. Simulation results show that the proposed protocol\noutperforms existing routing protocols in terms of data delivery ratio and average transmission delay in typical urban\nscenarios....
Wireless rechargeable sensor networks are becoming crucial and important in recent years for the advancement of\nwireless energy transmission technology. The previous research showed that not all of sensors can be recharged due\nto the limitation of energy capacity that mobile chargers can carry. If a sensor playing a critical role in a sensing task\ncannot function as usual due to exhausted energy, then the sensing task will be interrupted. Therefore, this paper\nproposes a novel recharging mechanism taking the coverage of sensors into consideration such that mobile chargers\ncan recharge the sensor with a high coverage degree and the network lifetime can be efficiently sustained. The\ncoverage degree of each sensor depends on its contribution to the sensing task, including the coverage and\nconnectivity capabilities. Based on the coverage degree, the sensor with a higher coverage degree will be properly\nrecharged to extend the network lifetime. Simulation results show that the proposed mechanism performs better\nagainst the related work in network lifetime....
The Transmission Control Protocol (TCP) is one of the main communication protocols in the Internet, and it has been\ndesigned to provide an efficient reaction to packet loss events which are due to network congestion. Congestion is the\nmain cause of losses in wired networks, but in today heterogeneous networks, loss events can also be introduced due\nto higher error rates on wireless channels, host mobility, and frequent handovers. Unfortunately, all packet losses are\ninterpreted by TCP as a sign of congestion, triggering an inappropriate reaction which reduces its transmission rate\nand leads to performance degradation. In order to avoid this problem, it is important for TCP to correctly understand\nwhether the reason of a packet loss is due to congestion or to a problem in the wireless link. This paper presents an\ninnovative jitter-based cross-layer TCP algorithm, named XJTCP. It adopts the jitter ratio as loss predictor, joined with a\nlayer two notification, in order to correctly infer the nature of a loss event. Performance evaluation and comparison\nwith other common TCP implementations shows how XJTCP can be an interesting solution in the presence of wireless\nenvironments....
Cooperative spectrum sensing in cognitive radio (CR) networks is studied in which each CR performs energy\r\ndetection to obtain a binary decision on the absence/presence of the primary user. The problem of interest is how to\r\nefficiently report and combine the local decisions to/at the fusion center under fading channels. In order to reduce\r\nthe required transmission bandwidth in the reporting phase, the paper examines nonorthogonal transmission of local\r\ndecisions by means of on-off keying. Proposed and analyzed is a novel decoding-based fusion rule that essentially\r\nperforms in three steps: (1) estimating minimum mean-square error of the transmitted information from cognitive\r\nradios, (2) making hard decisions of the transmitted bits based on the estimated information, and (3) combining the\r\nhard decisions in a linear manner. Simulation results support the theoretical analysis and show that the added\r\ncomplexity of the decoding-based fusion rule leads to a considerable performance gain over the simpler\r\nenergy-based fusion rule when the reporting links are reasonably strong....
With the flourishing development of wireless communication, further challenges will be introduced by the future demands of emerging applications. However, in the face of more complex communication scenarios, favorable decoding results may not be yielded by conventional channel decoding schemes based on mathematical models. The remarkable contributions of deep neural networks (DNNs) in various fields have garnered widespread recognition, which has ignited our enthusiasm for their application in wireless communication systems. Therefore, a reliable DNN-based decoding scheme designed for wireless communication systems is proposed. This scheme comprises efficient local decoding using linear and nonlinear operations. To be specific, linear operations are carried out on the edges connecting neurons, while nonlinear operations are performed on each neuron. After forward propagation through the DNN, the loss value is estimated based on the output, and backward propagation is employed to update the weights and biases. This process is performed iteratively until a near-optimal message sequence is recovered. Various factors within the DNN are considered in the simulation and the potential impacts of each factor are analyzed. Simulation results indicate that our proposed DNN-based decoding scheme is superior to the conventional hard decision....
In wireless sensor networks, nodes may adopt selfish behavior to save their energy\nresources, which causes energy imbalance among nodes, because of lacking a central controller with\nthe function of making nodes cooperate. Noncooperative game is an effective tool for portraying this\nkind of selfish behavior. In this paper, we address the problems of transmission power minimization\nand energy balance using a topology control game. Firstly, we establish a topology control game\nmodel and prove that the topology game model is an ordinal potential game with Pareto optimality.\nSecondly, based on this model, we propose an Energy Balance Topology control Game algorithm\n(EBTG), in which, by taking the energy efficiency and energy balance of the nodes into account,\nwe design an improved optimization-integrated utility function by introducing the Theil index.\nFinally, simulation results show that the EBTG algorithm can improve the energy balance and energy\nefficiency, and can prolong the network lifetime in comparison with other topology control algorithms\nbased on game theory....
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