An Optimal Opportunistic Spectrum Access Approach

Xiao, Qirong; Gao, Q.; Xiao, Limin; Zhou, Shidong; Wang, J.

doi:10.1109/iccw.2009.5208061

Cited by 5 publications

(6 citation statements)

References 6 publications

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“…We can see from Corollary 3 that the optimal OSA approach is that the secondary user starts to transmit at an arbitrary time slot in [0, x opt max], where x opt max = 0 or 1/u ln(v/σ) and keeps transmitting for T a = ∞ or − ln(1 − σe ux /v)/u, respectively. This result is identical to [15].…”

Section: Exponential Distributionsupporting

confidence: 80%

“…Our last work [15] has evaluated and verified the optimal approach in the case that the idle period is exponential distribution. Therefore, in this section, we only evaluate these cases that the idle period follows uniform distribution or generalized Pareto distribution and present numerical and simulation results to evaluate and compare the performance of the optimal OSA approach and fixed STR approach.…”

Section: Numerical and Simulation Resultsmentioning

confidence: 99%

“…Our last work [15] has investigated the optimal design of the transmission time in the case that the idle period follows exponential distribution and presented an optimal OSA approach to maximize spectrum holes utilization under the constraint of collision tolerable level in this case. In this work, we propose a unified approach to optimal OSA approach under the constraint of collision tolerable level in more general cases.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Unified Approach to Optimal Opportunistic Spectrum Access under Collision Probability Constraint in Cognitive Radio Systems

Xiao

Zhong

et al. 2009

EURASIP J. Adv. Signal Process.

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We consider a cognitive radio system with one primary channel and one secondary user, and then we introduce a channel-usage pattern model and a fundamental access scheme in this system. Based on this model and fundamental access scheme, we study optimal opportunistic spectrum access problem and formulate it as an optimization problem that the secondary user maximizes spectrum holes utilization under the constraint of collision tolerable level. And then we propose a unified approach to solve this optimization problem. According to the solution of the optimization problem, we analyze and present optimal opportunistic spectrum access algorithms in several cases that the idle period follows uniform distribution, exponential distribution, and Pareto or generalized Pareto distribution. Theoretical analysis and simulation results both show that the optimal opportunistic spectrum access algorithms can maximize spectrum holes utilization under the constraint that the collision probability is bounded below collision tolerable level. The impact of sensing error is also analyzed by simulation.

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Section: Exponential Distributionsupporting

confidence: 80%

Section: Numerical and Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Unified Approach to Optimal Opportunistic Spectrum Access under Collision Probability Constraint in Cognitive Radio Systems

Xiao

Zhong

et al. 2009

EURASIP J. Adv. Signal Process.

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“…where, P i,k r is the received power by kth UE from transmitting GAA i.e. ith GAA, P S I is from equation 6The average downlink capacity when ith GAA is transmitting considering different combination of S I is given by equation (8).…”

Section: A Capacitymentioning

confidence: 99%

“…However, all of these studies are based on the instantaneous interference from SU to PU without considering the duty cycle of secondary users. In [8] with prior information regarding the PU idle period, authors formulate an optimisation problem to maximise the use of spectrum holes under the constraint of probability of collision. The aggregate interference caused by secondary users was not considered in this study.…”

Section: Introductionmentioning

confidence: 99%

Opportunistic Access to PAL Channel for Multi-RAT GAA Transmission in Spectrum Access System

Basnet

Jayawickrama

et al. 2017

2017 IEEE 85th Vehicular Technology Conference (VTC Spring)

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Spectrum Access System (SAS) is a three tier spectrum sharing framework proposed by the FCC. In this framework the aggregate interference of tier-3 General Authorised Access (GAA) users should be below a predetermined threshold anywhere within the tier-2 Priority Access Licensee (PAL) exclusion zone. GAA are expected to use a diverse range of Radio Access Technologies (RATs) with different levels of loading. We propose an optimal GAA power allocation and probability of spectrum utilisation scheme that meets the average aggregate interference constraint within the GAA network. Most of the capacity maximisation studies consider the instantaneous aggregated interference from secondary users. In this paper we present an average aggregated interference method to optimise the capacity of GAA users in a single channel. Simulation results suggest that we can significantly increase the capacity of the channel by considering the probability spectrum utilisation of GAA users.

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Reconfigurable front-end antennas for cognitive radio applications

Tawk

Bkassiny

El-Howayek

et al. 2011

IET Microw. Antennas Propag.

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This study presents new antenna schemes suitable for cognitive radio communications. The antenna structures consist of a ultra wide band (UWB) sensing antenna, and a frequency reconfigurable communicating antenna both incorporated into the same substrate. Two different techniques to achieve the required frequency agility are proposed. The first one is based on a rotational motion of the radiating patch whereas the second is based on optical switching. The importance of these techniques is that no bias lines are needed as is seen in the case of RF MEMs, PIN diodes and lumped elements. Prototype antennas were fabricated and a good agreement was observed between the simulated and the measured data.

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An Optimal Opportunistic Spectrum Access Approach

Cited by 5 publications

References 6 publications

A Unified Approach to Optimal Opportunistic Spectrum Access under Collision Probability Constraint in Cognitive Radio Systems

A Unified Approach to Optimal Opportunistic Spectrum Access under Collision Probability Constraint in Cognitive Radio Systems

Opportunistic Access to PAL Channel for Multi-RAT GAA Transmission in Spectrum Access System

Reconfigurable front-end antennas for cognitive radio applications

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