Given that the statistical analysis of the frequency band of interest are available, it has been shown that adaptive searching for white spaces could improve by 70% when compared with random searching. In this paper, we characterize and provide a statistical estimation of the number of channels available for opportunistic usage by secondary users (SUs)…
Category: B.TECH PROJECTS IN OMENT++
Representation of spectrum sensing experimentation functionality for federated management and control
Spectrum sensing is one of the core functionalities of a true cognitive radio (CR) that supports operation over a broad range of frequencies and can autonomously adapt transmission parameters to the operating environment. There are several types of hardware ranging from sophisticated (i.e. Nutaq Radio420X FPGA mezzanine card) to low cost (i.e. WiSpy) that can be used to…
Resource Allocation for Power Minimization in Multi-Band Wireless Networks
This paper designs a resource allocation to minimize the total transmit power of a multi-band wirelessnetwork under the required rate constraint. The required rate splitting scheme is proposed to reduce the computational complexity of the multi-band resource allocation. On the basis of the primal decomposition method, the multi-band resource allocation is decomposed into multiple sub-band…
Performance Analysis of Arbitrarily-Shaped Underlay Cognitive Networks: Effects of Secondary User Activity Protocols
This paper analyzes the performance of the primary users (PUs) and secondary users (SUs) in an arbitrarily-shaped underlay cognitive network. In order to meet the interference threshold requirement for a primary receiver at an arbitrary location, we consider different SU activity protocols that limit the number of active SUs. We propose a framework, based on the moment-generating…
Study and analysis of adaptive multitaper method in diverse fading channels for cognitive radio
The primary task of Cognitive Radio (CR) technology is to sense the underutilized radio spectrum and to allocate it to the secondary users dynamically without any harmful interferences to primary users of the licensed band either in frequency domain or in time domain. Multitaper Method is one of the most efficient nonparametric spectral assessment techniques which provide an accurate, effectual…
Mobile access of the DVB-T channel and the opportunity for cognitive spectrum utilization
The main goal of the Cognitive Radio (CR) systems is the intelligent and efficient utilization of the radiospectrum. In this paper we introduce our survey in wideband spectrum measurement for studying the Terrestrial Digital Video Broadcasting (DVB-T) frequency bands that are one of the future candidates for cognitive radio applications. The actuality of this subject is that during 2013 Hungary changed the…
Performance Analysis of Cognitive Radio Systems With Imperfect Channel Sensing and Estimation
In cognitive radio systems, employing sensing-based spectrum access strategies, secondary users are required to perform channel sensing to detect the activities of licensed primary users in a channel, and in realistic scenarios, channel sensing occurs with possible errors due to miss-detections and false alarms. As another challenge, time-varying fading conditions in the channel between the secondary transmitter and…
Six-port technology for MIMO and cognitive radio receiver applications
Six-port technique is a very accurate and cost effective method to determine the amplitude and phase of any input signal with respect to a known signal using only power or voltage measurements. This property of six-port technique has been variously exploited in a number of RF (radio frequency) and microwave applications. The present paper provides a…
Performance analysis in direction oriented graded cognitive network using Bayesian model approach for path determination
Some of the challenges involved in current Internet routing are limitations of the process enabling routing techniques, handling of explosion of messages and absence of awareness about the environment. This paper presents a comparative analysis using Bayesian model of a network having a randomly distributed quality parameters when subjected to quality grading and direction oriented for optimal…
Optimum welch FFT segment size for duty cycle estimation in spectrum awareness system
In order to realize practical dynamic spectrum access (DSA), implementing spectrum sensing with reasonably low cost is very challenging due to the required detection accuracy and quickness. For this issue, we have introduced an extended DSA, smart spectrum access (SSA), where any useful information in terms of spectrum utilization, such as statistics regarding spectrum utilization,…