There is an explosion in the field of communication technology today with the advent of numerous services being offered by various vendors. The available spectrum today is very limited and highly congested. Moreover, static allocation and assignment to a particular party leads to inefficient usage as it cannot be put to use incessantly. Also, the allocation is made for a specific technology and...

Cognitive radio is a promising technology to improve the utilization of wireless spectrum resources. A serious threat to cognitive radio networks (CRN) which sense the spectrum in a cooperative manner is the transmission of false spectrum sensing data by malicious secondary nodes, namely spectrum sensing data falsification (SSDF) attacks. SSDF attackers start to attack the network in the case o...

Cognitive radios (CR) are intelligent radio devices that can sense the radio environment and adapt to changes in the radio environment. Spectrum sensing and spectrum access are the two key CR functions. In this paper, we present a spectrum sensing error aware MAC protocol for a CR network collocated with multiple primary networks. We explicitly consider both types of sensing errors in the CR MA...

Conclusions: • Reduced computation time from 13 hours (previous benchmark algorithm) to 30 seconds (above algorithm) for 500 rounds. • A fast, low complexity, cheap, and cognitive method of detecting TVWS. • Requires sampling rates well below Nyquist theory (25% of Nyquist theory). • We present a novel frequency estimation framework for spectral White Spaces. • Databases are one way to maintain...

Cognitive radio systems need to be able to robustly sense spectrum holes if they want to use spectrum opportunistically. However, this problem is more subtle than it first appears. It turns out that real-world uncertainties make it impossible to guarantee both robustness and high-sensitivity to a spectrum sensor. A traditional time-domain perspective on this is relatively straightforward, but t...

Recently, both optimal and suboptimal spectrum sensing approaches have attracted extensive attention in wireless communications field. Thanks to opportunistic spectrum access schemes, different cognitive users can cooperatively search for and exploit instantaneous spectrum availability. In this paper, we address the analysis of spectrum sensing in opportunistic spectrum access models and then d...

The successful deployment of dynamic spectrum access requires cognitive radio (CR) to more accurately find the unoccupied portion of the spectrum. An accurate spectrum sensing technique can reduce the probability of false alarms and misdetection. Cooperative spectrum sensing is usually employed to achieve accuracy and improve reliability, but at the cost of cooperation overhead among CR users. ...

Spectrum sensing is a fundamental operation in cognitive radio environment. It gives information about spectrum availability by scanning the bands. Usually a fixed amount of time is given to scan individual bands. Most of the times, historical information about the traffic in the spectrum bands is not used. But this information gives the idea, how busy a specific band is. Therefore, instead of ...

Cognitive Radio allows opportunistic spectrum access (OSA) of licensed frequency bands by unlicensed users so as to reduce spectrum scarcity led by the increasing market demands. Spectrum sensing is an essential mechanism for a cognitive radio system. Therefore attention should be given towards the security aspects of spectrum sensing in cognitive radio. This paper analyses the two protocols me...

Cognitive radio reduces the spectral inefficiency by sensing the under and over utilized parts of the spectrum and then redistributing the transmission to ensure that the spectrum is used efficiently. The awareness about spectrum usage is obtained by spectrum sensing. Cyclostationary feature detections one of the spectrum sensing techniques for cognitive radio. In this paper, we detect the pres...