Spectrum management

About: Spectrum management is a research topic. Over the lifetime, 5704 publications have been published within this topic receiving 119199 citations.

Antenna Selection in MIMO Cognitive Radio

Abstract: Wireless users use radio frequency (RF) channels for data and message communication. The recent research reviles that the most appropriate to tackle the issues related to spectrum utilization is a function of time and space calls for dynamic access strategies that adapt to the electromagnetic environment. Cognitive radio is one such solution with the ability to sense the RF channel evaluation and adaptively react intelligently in order to optimize the usage of the available spectrum. In this paper we focus on opportunistic resource allocation between the access points (AP) and the wireless stations (STA) for the required spectrum management policies of the wireless systems. A concurrent communication of the cognitive users, competing over the physical resources for the end users. Based on the requirements of this we propose and analyze a channel capacity [6] enhancement technique to design a cognitive multiple input multiple output (MIMO) transceiver system and propose low complexity antenna selection [15] algorithms. Using this technique only a subset of the available antennas to transmit or receive signal greatly reduce the cost and complexity of the physical layer resources of cognitive MIMO system.

Sounding reference signal transmission in unlicensed spectrum

Abstract: Embodiments of the present disclosure relate to methods, devices and computer readable storage mediums for sounding reference signal (SRS) transmission in unlicensed spectrum. In example embodiments, a method implemented at a terminal device is provided. According to the method, in response to determining that there is a transmission gap in unlicensed spectrum, a configuration is determined for transmitting a SRS to a network device in the transmission gap. The SRS is transmitted to the network device in the transmission gap based on the configuration. Embodiments of the present disclosure enable SRS transmission in a transmission gap (for example, within a self-contained COT), no matter whether an explicit trigger for SRS transmission is provided or not. By occupying the transmission gap with SRS transmission, the transmission opportunities of uplink control information can also be increased.

Implementation of DeJong radio propagation algorithm as a virtual sensor for cloud services to enhance radio spectrum management

Abstract: This paper proposes a strategy to implement radio propagation algorithms as cloud services using cloud computing to support radio spectrum management. The DeJong radio propagation algorithm was selected to be implemented. The strategy supports not only radio propagation algorithms but also a combination of hardware measurement and software simulation as well as other applications where sensors are used. The strategy involves mainly virtual sensors which can run in virtual servers such as web services and therefore as part of Internet of Things (IoT) technology. Many benefits arise from this solution and it offers possibilities for different kind of specialists and users who can cooperate for the development of services in a flexibly way, as system engineers are freed of the heavy task of sensor implementation and are encouraged to focus in architecture scalability, security and exploring high availability of services. The mere fact of having implemented the DeJong algorithm as a cloud service represents an important contribution to Spectrum Management technics, especially for those looking forward to Advanced IMT technologies where other algorithms are not effective.

Graphic applications for spectrum management using personal computers

Abstract: Recent technological advances have made it possible to develop cost-effective computer graphics tools for spectrum management using personal computers. To illustrate this, two applications which have been recently implemented at the Canadian Department of Communications are described. The first application overlays microwave data from the licensing database into digitized maps. This assists radio engineers in planning future microwave systems. The second application automatically draws earth station coordination contours, thus eliminating a tedious and manual process. These applications are called the Microwave Environment Display System (MEDS) and the Earth Station Coordination Contour Display System (CONTOUR), respectively. Based on experience with these application, it appears that the major cost is associated with the application program development and not the hardware. It is suggested that this investment can be protected by selecting a computer graphics language like GKS which is an international standard and is designed to be portable from one installation to another. >

Cognitive Radio Network Technology: Security, Architecture and Assessment

Abstract: Due to the ever-increasing scarcity of spectrum resources, Cognitive radio networks have become an important part of wireless networking system. Such type of networks perform co-operative spectrum which sense to find white spaces and apply various policies to determine when and in which bands they may communicate. A number of wireless applications have been developing over the last decade. Most of the frequency spectrum has already been certified by Government agencies, like Federal Communications Commission (FCC). Therefore, there is an apparent spectrum scarcity for new wireless services. So the unused spectrum is efficiently utilized by the Cognitive radio for secondary usage without interfering a primary licensed user. In an environment, a primary licensed user can share spectrum occupant‘s information with a secondary user to enable dynamic spectrum access. Cognitive radio is becoming increasingly technology targeting to improve the utilization of the radio electromagnetic spectrum. For performing signal processing, a cognitive radio device uses general purpose computer processors that run radio applications software which enables the device to sense and understand its environment and change its mode of operation based on its observations. Unfortunately, this solution causes new security challenges. Our objective in this paper is to analyze the security issues of recent advancements and architecture of this network and future scope.