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LTE operation in unlicensed spectrum is emerging as a promising technology in achieving higher data rate with LTE since ultra-wide unlicensed spectrum, e.g., about 500 MHz at 5–6 GHz range, is available in most countries. Recently, 3GPP has finalized standardization of licensed assisted access (LAA) for LTE operation in 5 GHz unlicensed spectrum, which has been a playground only for Wi-Fi. LAA defines...
The problem of cooperative spectrum leasing among multiple primary users (PUs) and secondary users (SUs) is considered. A hybrid Stackelberg-coalition formation game theoretic algorithm is proposed that enables the PUs to identify a group of cooperative SUs by looking at the reputation history of their cooperative behavior. The coalition formation approach also promotes collaboration among the SUs...
While the traditional Visible Light Communication (VLC) system has attracted a lot of research attentions on boosting throughput, using Commercial Off-The-Shelf (COTS) devices, e.g. existing cameras on the smartphones, is a recent trend to implement readily deployable VLC systems. In particular, since LED-Camera VLC systems have shown a promising potential in large indoor communication due to the...
With rapid development in wireless applications, there arises a demand for available spectrum. Cognitive radio technology is a promising solution to enhance the spectrum utilization by enabling unlicensed users to exploit the spectrum in an opportunistic manner. Since unlicensed users are temporary visitors to the licensed spectrum, they are required to vacate the spectrum when a licensed user reclaims...
In this paper, an asymptotic analysis of the inversely proportional setting (IPS) of carrier sense threshold (CST) and transmission power in densely deployed wireless local area networks (WLANs) is presented. In densely deployed WLANs, CST adjustment is a crucial technology to enhance spatial channel reuse, but it can starve surrounding transmitters due to an asymmetric carrier sensing relationship...
Cognitive Radio (CR) technology offers a promising solution to the spectrum scarcity problem via Dynamic Spectrum Allocation (DSA). Due to the nature of Cognitive Radio Networks (CRNs), where two networks are active simultaneously, a significant amount of control messaging is required in order to coordinate channel access, schedule sensing, and establish release connections. Efficient Control Plane...
With the relative inexpensiveness of 3D sensors today, it has become easier to collect 3D spatial data. This opens up the usability for these data, called point clouds, in areas such as robotics, telemedicine, and entertainment. However, a primary issue is the data rate of point clouds being produced by sensors such as the Microsoft Kinect. When transmitted, the size of a single point cloud coupled...
This paper reports the first single-chip atomic force microscope (sc-AFM) array that simultaneously acquires multiple images of a sample. The design, fabrication in a CMOS-MEMS process, and characterization of a 4×1 array is presented in this paper. Four AFM cantilevers share an electrothermal (ET) lateral stage while each AFM cantilever is independently driven, sensed, and controlled. The reported...
As a micro engineered biomimetic system to replicate key functions of living organs, organs-on-a-chip (OC) technology provides a high-throughput model for investigating complex cell interactions with a high temporal and spatial resolution in biological studies. Typically, microscopy and highspeed video cameras are used for data acquisition, which are expensive and bulky. Recently, compressed sensing...
Energy consumption becomes a very important performance indicator of manufacturing system. By turning non-bottleneck machines into sleep mode, energy saving system operation in real time will be indispensable strategy for modern information rich manufacturing system under Industry 4.0 environment. From the system perspective, a general energy saving operation strategy is proposed to utilize the transient...
The proposed work aims at designing routing method and data compression algorithm for WSN's. An ad-hoc network (WANET) is considered and based on certain criteria the data is forwarded dynamically. Various parameters such as Compression Ratio, Packet Delivery Rate, Energy consumption are considered to determine the efficiency of the network. One of the primary parameters to be considered in the configuration...
With the introduction of 4G/5G technologies it seems possible to overcome the limitation to transmit high quality image/video for the deployment of Telemedicine services. A scenario of remote hospital is considered to study the effect of simultaneously transmitting medical data, images and video. In order to achieve high video compression at reduced sampling rate, a joint Compressed Sensing-SPIHT...
Deployment of Multiple Cognitive Radio Networks (CRNs) is a very common scenario in today's world, like in the field of defence or disaster management. In this paper, we deal with the case of multiple numbers of co-located CRNs acting as secondary network along with one primary user (PU). We study the node based throughput performance of a CRN in presence of several coexisting CRNs. We generalize...
In cognitive radio (CR), the spectrum sensing of the primary user (PU) may consume some electrical power from the battery capacity of the secondary user (SU), yielding to decrease the transmission power of the SU. In this paper, a multislot simultaneous spectrum sensing and energy harvesting model is proposed, which uses the harvested radio frequency (RF) energy of the PU signal to supply the spectrum...
In this paper, we investigate the coexistence problem between Wi-Fi and a pre-standard form of LTE over unlicensed bands, namely, LTE-Unlicensed (LTE-U). We address two coexistence problems. First, the different access mechanisms for Wi-Fi and LTE-U can lead to an increase in the collision rate and higher latency for both systems. We propose a modified Wi-Fi operation mode, whereby Wi-Fi stations...
Recently, some CSMA/CD-alike protocols have been proposed for full-duplex (FD) WiFi networks, in which users are able to monitor the channel and transmit data simultaneously so as to avoid data collisions and improve the spectrum efficiency. However, along with its benefits, the residual self- interference (RSI) brought by FD becomes a new challenge for the network. As the RSI increases with the transmit...
In multi-channel cognitive radio ad hoc networks (CRAHNs), packet fragmentation is impacted by new factors besides those in traditional wireless networks due to the unique CR functions. For example, spectrum handoff is the technique for a secondary user (SU) to continue its transmission when a primary user (PU) reoccupies its current transmitting channel. Then, a short frame is less likely to be affected...
Abstract-In cognitive radio networks, secondary users (SUs) face two conflicting objectives. Each SU seeks to minimize the sensing duration while maximizing the detection probability of primary users (PU) to avoid interfering with their transmissions. Both objectives have a substantial effect on energy efficiency. This paper investigates a noncooperative setting for selecting the sensing duration...
Internet of Things (IoTs) is gaining increasing significance due to real-time communication and decision making capabilities of sensors integrated into everyday objects. Predicting performance in IoTs is critical for detecting performance bottlenecks, designing optimal sleep/wake-up schedules and application-aware performance tuning. However, performance prediction becomes a significant challenge...
Selection of appropriate detection threshold (λ) is a very critical task in energy detection scheme based cognitive radio (CR) system. λ is mainly selected by using two principles called as constant detection rate (CDR) in which λ is calculated by taking fixed value of probability of detection (Pd) and constant false alarm rate (CFAR) in which λ is calculated by taking fixed value of probability of...
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