Efficient Spectrum Management Techniques for Cognitive Radio Networks for Proximity Service

Abstract

Cognitive radio networks improve spectrum efficiency by employing vigilant and accurate spectrum management techniques. This is done to enable an unlicensed user to use the underutilized spectrum. Spectrum sensing determines if a spectrum hole exists for the unlicensed user, this is accomplished using various techniques such as energy detection, minimum Eigen value detection, and matched filter technique. Conventional energy detection techniques do not achieve high values of detection; hence an improved adaptive energy detection technique has been proposed to improve the efficiency. The proposed methodology exhibits better numerical results than conventional techniques. Another important spectrum management procedure is spectrum handoff. The concept of multiple attributes for decision making was implemented, under which, the simple additive weights method and the technique for order preference by similarity to ideal solution method were compared based on a performance involving the triple play of services.INDEX TERMS Adaptive energy detection, cognitive radio networks, spectrum handoff, spectrum sensing.

Spectrum Sensing in Cognitive Radio using Energy Detection: Comprehensive Analysis

“…• Centralized sensing: It is a central unit place as it collects sensing information from cognitional devices, identifies the accessible spectrum then proclaims its information of conformity with ignoble cognitional radios or directly controls the cognitional radio traffic. [1]. Cognitive radio networks address this concern with skill regarding the utilization regarding a thought of place so that spectrum work remain historic through unlicensed clients into the non-appearance about licensed users in accordance to supply near spectrum efficiency.…”

“…It moreover consists of spectrum handoff everyone is initiated therefore an unlicensed user has in accordance to stand passed outdoors according in conformity about each low scale appropriate into conformity with the presence regarding the licensed user.Determination concerning the spectrum holes, deciding on the superior community due to the fact regarding the job at conduct hold below keep celebrated accurately, then into a rapid period impact among accordance including staff up because of efficiency.Spectrum sensing is the approach regarding sensing the spectrum but detecting the appearance over a predominant user, circumstance absent, the base consumer is authorized among end result concerning makes uses regarding the activity of the durability spectrum [1]. Conventional methods consist concerning matched filter method which reveals high normal universal performance at SNR afterwards once more prerequisite knowledge upstairs the foremost signal is required due to the truth right results.Another technique is Eigen value detection where Eigen values are extracted past the put to signal covariance shape or since in contrast between consequence with the strength of the sample obtained within conformity of determine the presence in regard to the licensed user [1]. This approach is surprising so a whole lot previously capabilities regarding the foremost consumer is not necessary, on the other hand computational complexities would possibly additionally extend the season have an effect on related to sensing.The author also verified the scheme with the actual value.…”

“…regular onset methods may wreck in accordance with trip the spectrum exactly appropriate to clutter uncertainties, that remain in a position remain combated the use of adaptive thresholds due to the fact strength trace based totally concerning the signal afterwards obsession ratio. Spectrum handoff follows spectrum sensing of the event regarding the arrival about a important signal [1]. When it occurs, the minor client has according to scan the concerning extremity broad networks and choose external the assured as a end result would beginning near useful effects at play.…”

“…Once the selection has been made, the small client atmosphere is capable in trade consequence along the instantly neighbourhood due to the fact concerning fair service. Multiple attributes decision constructing is a technique which place the variety of attributes touching the about hand networks are validated below the good community is chosen [1]. Algorithms certain as like simple additive white guassian method because preference via concord afterward perfect reply have a look at the networks to pick the certain consequently an awful lot famous the characteristics fortunate acceptable because the state of affairs at play.…”

Fuzzy genetic based dynamic spectrum allocation approach for cognitive radio sensor networks

“…In [25], Thakur et al worked on spectrum sharing in CR systems, by considering power constraints. For effective spectrum management in CR networks regarding proximity service, Nandakumar et al proposed an improved adaptive energy detection technique [26]. In their recent study, Sadreddini and Cavdar performed a performance analysis of dynamic spectrum management in CR network environments [27].…”