hi sir
i am bashar ali , Phd student in the first semester. i am interest in spectrum sensing field and this code will help me a lot.
if you can give me i will be appreciated.
Thank you in advance
regards
bashar ali
Posts: 6,843
Threads: 4
Joined: Mar 2015
matlab code energy based spectrum sensing in cognitive radio energy threshold based algorithm
ABSTRACT
Spectrum sensing is the basic and essential mechanisms of Cognitive Radio (CR) to find the unused spectrum. This paper presents an overview of CR architecture, discusses the characteristics and benefits of a CR. Energy detection based spectrum sensing has been proposed and used widely because it doesn't require transmitted signal properties, channel information, or even the type of modulation. In this paper, a survey of energy detector over Additive White Gaussian Noise (AWGN), different fading channels for spectrum sensing methodologies in cognitive radio is presented.Theoretical analysis of time domain energy detection and threshold setting is investigated. Cooperative spectrum sensing and a multiple antenna processing based energy detector receptions are also discussed.
Introduction
The performance of a cognitive radio system depends on how well it can maximize the usage of a free frequency band without causing any interference to the primary user. Thus the abilities to detect a primary user as well as to avoid any false alarm are of paramount importance for such a system. For energy detector based spectrum sensing in cognitive radios, these abilities are influenced by the threshold set to distinguish signal from noise. Conventional energy detectors are based on a fixed threshold. This may not be optimum in low SNR conditions where the performance of fixed threshold based detector can vary from the targeted performance metrics substantially. In this paper, we propose a method to change the threshold based on the number of samples, to optimize the detection parameters, namely probability of detection and probability of false alarm. We also introduce a control parameter which is used to vary the set threshold and thereby obtain a response more suited to the operational requirements than that obtained by a fixed threshold based energy detector. Simulation results are presented to show a different perspective of the importance of the sensing time to the performance metrics of the energy detector.
06-08-2016, 03:30 PM
I need a mat lab code corresponding the spectrum access channel from primary user to secondary user to demonstrate that code to UG students please send the code for that