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....
With the rapid evolution of wireless networks, the need to explore novel technologies to meet the demands of future systems, particularly 6G, has become a significant challenge. One promising solution is integrating radio frequency (RF) and optical wireless communication (OWC) technologies to leverage their unique strengths. This paper introduces a novel model for integrating RF and OWC technologies within the framework of emerging 6G. The main objective of this approach is the dynamic technology selection (TS) and modulation scheme selection (MSS), which play a pivotal role in optimizing network efficiency and adapting to diverse 6G requirements. The proposed cross-layer architecture integrates the application layer, network layer based on a software-defined network (SDN), and physical layer consisting of a hybrid cell and software-defined radio with optical functionality (SDRO). This approach facilitates real-time decision-making based on environmental factors and application requirements....
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....
To address the phase noise issue in terahertz OFDM system, this paper proposes a dual-branch deep learning phase noise compensation network named AdaPhaseNet. The Transformer branch of this network leverages the powerful modeling capability of Transformers for long-range dependencies to achieve long-range phase noise estimation and compensation, while the CNN branch is employed for local signal enhancement. Finally, an optimized signal is output through a confidence-driven adaptive fusion module. For experimental validation of the algorithm, we constructed a photonic terahertz communication system comprising 10 km of fiber and 5 m of wireless transmission. Experimental results show that, compared with multiple baseline models, AdaPhaseNet achieves relative BER reductions ranging from 37.0% to 57.9% and EVM gains ranging from 1.4 dB to 3.2 dB....
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