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Internet of Things (IoT) is the latest technology in this era of wireless communication, which connects the devices to internet for control and monitoring applications. The complete world is now looking forward to use this technology at cities and in other fields, which make them smart. The main objective of this work is to identify communication modules under sub GHz that can provide coverage in...
This paper deals with the design of an LC Voltage Controlled Oscillator (LC VCO) with and without an Automatic Amplitude Controller (AAC). In order to achieve a wide band tuning range specified in IEEE 802.22 the VCO core incorporates a Switched Capacitor Array (SCA). An amplitude controlling technique is used to stabilize the oscillation amplitude over the frequency band. The LC VCO with an AAC circuit...
We investigate the problem of energy-efficient dynamic spectrum access (DSA) in a cognitive Third Generation Partnership Project (3GPP) long-term evolution (LTE) network based on IEEE802.22 architecture. In this architecture, the network resources are allocated to the end-users and the evolved NodeBs (eNBs) by the spectrum manager (SM) using some optimal resource allocation strategy. In particular,...
In this paper we present a novel approach for resource allocation in cognitive radio network (CRN) with heterogeneous user traffic. In this approach we deploy some form of reinforcement learning, and make a short-term resource allocation based on the long-term traffic prediction. The corresponding resource allocation algorithm derived in the paper is implemented in cognitive 3rd Generation Partnership...
This paper provides a new approach allocating resources between multimedia users in a multi-cell OFDMA system in order to maximize the number of users that can achieve their QoS requirements. It does this by formulating the problem as a non-cooperative game. We propose a distributed algorithm to get the Nash equilibrium (NE) as well as introducing a new performance indicator (the qualified throughput)...
In cognitive sensor networks, the first cognitive task preceding any form of dynamic spectrum management is the sensing and identification of spectrum holes in wireless environments. Research in the physical and medium access control layers for DSA (Dynamic Spectrum Access) and DSS (Dynamic Spectrum Sharing) is currently at its early development. Aspects such as spectrum sensing and spectrum management...
This paper describes the design and verification of IEEE 802.22 WRAN physical layer. The WRAN physical layer is fundamentally based on the IEEE 802.16e system, but the OFDMA parameters including preamble structure and pilot pattern are newly designed by considering the WRAN channel environments. In this paper, we present the simulation models and results by using appropriate synchronization and channel...
Future communications systems are evolving with the goal of providing optimal connectivity and data throughput to the user. Cognitive Radio is regarded as the core technology in satisfying this user demand. Spectrum sharing between heterogeneous communication services based on flexible spectrum policy will be the primary application of CR technology. In this paper, the role of RF system and IC in...
The next generation of wireless networks, as envisioned by recent advances in cognitive radio (CR) technologies, will be autonomic and able to adjust their configurations to changes in the communications environment. There are three types of CRs, such as IEEE802.22 radio, multiple-radio with CR functions, and so-called fully configurable radios. Reconrigurable networks use these CRs and spectra efficiently...
The next generation of wireless networks, as envisioned by recent advances in cognitive radio (CR) technologies, will be autonomic and able to adjust their configurations to changes in the communications environment. There are three types of CRs, such as IEEE 802.22 radio, multiple-radio with CR functions, and so- called fully configurable radios. Reconfigurable networks use these CRs and spectra...
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