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Power control in cognitive radios under cooperative and non-cooperative spectrum sensing

by Edward C. Y. Peh, Student Member, Ying-chang Liang, Yong Liang Guan, Yonghong Zeng, Senior Member - IEEE Transactions on Wireless Communications , 2011
"... Abstract—In an opportunistic spectrum access (OSA) based cognitive radio system, a secondary user (SU) is allowed to access the licensed spectrum of the primary user (PU) when it is inactive. Conventional power allocation strategies, which do not consider spectrum sensing information (SSI), may not ..."
Abstract - Cited by 5 (0 self) - Add to MetaCart
during the sensing period of the frame. We consider both cooperative and non-cooperative spectrum sensing scenarios. In non-cooperative spectrum sensing, the SU transmitter (SU-Tx) has its SSI while in cooperative spectrum sensing, the SU-Tx has both its SSI and the SU receiver’s (SU-Rx’s) SSI. Using

Implementation issues in spectrum sensing for cognitive radios

by Danijela Cabric, Shridhar Mubaraq Mishra, Robert W. Brodersen - in Proc. the 38th. Asilomar Conference on Signals, Systems, and Computers , 2004
"... Abstract- There are new system implementation challenges involved in the design of cognitive radios, which have both the ability to sense the spectral environment and the flexibility to adapt transmission parameters to maximize system capacity while co-existing with legacy wireless networks. The cri ..."
Abstract - Cited by 440 (7 self) - Add to MetaCart
signal to noise ratios. In addition, to further improve the sensing reliability, the advantage of a MAC protocol that exploits cooperation among many cognitive users is investigated. I.

Suraj Kumar Sharma

by Prashant Mohan Trivedi, Mtech Scholar, Assitant Professor, M. Tech Scholar
"... Abstract—Cognitive Radio (CR) is a self-monitoring wireless communication system. It can utilize the radio frequency spectrum efficiently. The CR user can opportunistically use those idle spectrum bands without causing harmful interference to the licensed/primary user. There are several spectrum sen ..."
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sensing techniques which can serve the purpose. In this paper, non-cooperative spectrum sensing is performed by energy detection spectrum sensing and cyclostationary (both one-order and two-order) feature detection technique these are the local spectrum sensing techniques. Using the results obtained

Comparative Study of Spectrum Sensing Methods in Cognitive Radio Network

by Sarwar Ali, Md Monirul Islam
"... Abstract: Rapid growth of wireless applications and services has made it essential to address spectrum scarcity problem in the limited available spectrum. Thus we need a new communication paradigm to utilize the existing wireless spectrum and efficient in spectrum usage. Cognitive Radio technology a ..."
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is most suitable under low SNR in the case of non-cooperative spectrum sensing and Matched filter gives average performance than other techniques.

Spectrum Sharing for Unlicensed Bands

by Raul Etkin, Abhay Parekh, David Tse - in IEEE DySPAN 2005 , 2005
"... We study a spectrum sharing problem in an unlicensed band where multiple sys-tems coexist and interfere with each other. Due to asymmetries and selfish system behavior, unfair and inefficient situations may arise. We investigate whether efficiency and fairness can be obtained with self-enforcing spe ..."
Abstract - Cited by 302 (4 self) - Add to MetaCart
the optimal operating point, efficient, fair, and incentive compatible spectrum sharing becomes possible. We present examples that illustrate that in many cases the performance loss due to selfish behavior is small. We also prove that our results are tight and quantify the best achievable performance in a non-cooperative

Prescient beamforming for multi-user interweave cognitive radio networks

by Amitav Mukherjee, A. Lee Swindlehurst - in Proc. 2011 IEEE Int. Workshop Comput. Advances in Multi-Sensor Adaptive Process , 2011
"... Abstract—This work investigates a fundamentally novel inter-weave cognitive radio network where the primary transmitter takes a proactive approach towards improving the accuracy of the spectrum sensing outcomes at the secondary users (SUs). For the single-primary-receiver scenario considered here, t ..."
Abstract - Cited by 2 (2 self) - Add to MetaCart
, which we refer to as prescient precoding, is to minimize the probability of interference from SUs at the primary receiver due to imperfect spectrum sensing in fading channels. Numerical results are presented to verify the advantages of the proposed prescient transmission techniques for non-cooperative

Cooperative sensing among cognitive radios

by Shridhar Mubaraq Mishra, Anant Sahai, Robert W. Brodersen - In Proc. of the IEEE International Conference on Communications (ICC , 2006
"... Abstract — Cognitive Radios have been advanced as a technology for the opportunistic use of under-utilized spectrum since they are able to sense the spectrum and use frequency bands if no Primary user is detected. However, the required sensitivity is very demanding since any individual Radio might f ..."
Abstract - Cited by 289 (15 self) - Add to MetaCart
Abstract — Cognitive Radios have been advanced as a technology for the opportunistic use of under-utilized spectrum since they are able to sense the spectrum and use frequency bands if no Primary user is detected. However, the required sensitivity is very demanding since any individual Radio might

B.sc (Hons) & M.sc in CSE, Islamic University,

by Mohammad Alamgir Hossain, Md. Shamim Hossain, Md. Ibrahim Abdullah
"... Copyright © 2012 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. ABSTRACT: Cognitive radio is a new and exciting techn ..."
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of cooperative with non-cooperative spectrum sensing over Rayleigh fading channel based on AND, OR and MAJORITY rules. Comparing the non-cooperative curve with the cooperative curve over Rayleigh fading channel, we observed that spectrum sensing is better in presence of cooperation. We also observed

Sensing-throughput tradeoff for cognitive radio networks

by Ying-chang Liang, Senior Member, Yonghong Zeng, Senior Member, Edward C. Y. Peh, Anh Tuan Hoang - in Proc. IEEE Int. Conf. Commun.(ICC , 2006
"... Abstract—In a cognitive radio network, the secondary users are allowed to utilize the frequency bands of primary users when these bands are not currently being used. To support this spectrum reuse functionality, the secondary users are required to sense the radio frequency environment, and once the ..."
Abstract - Cited by 291 (19 self) - Add to MetaCart
Abstract—In a cognitive radio network, the secondary users are allowed to utilize the frequency bands of primary users when these bands are not currently being used. To support this spectrum reuse functionality, the secondary users are required to sense the radio frequency environment, and once

Second simulation of the satellite signal in the solar spectrum, 6S: An Overview

by Eric F. Vermote, Didier Tanre, Jean Luc Deuzé, Maurice Herman, Jean-jacques Morcrette , 1997
"... Remote sensing from satellite or airborne platforms of land or sea surfaces in the visible and near infrared is strongly affected by the presence of the atmosphere along the path from Sun to Target (surface) to Sensor. This paper presents 6S (Second Simulation of the Satellite Signal in the Solar S ..."
Abstract - Cited by 284 (17 self) - Add to MetaCart
Remote sensing from satellite or airborne platforms of land or sea surfaces in the visible and near infrared is strongly affected by the presence of the atmosphere along the path from Sun to Target (surface) to Sensor. This paper presents 6S (Second Simulation of the Satellite Signal in the Solar
Results 1 - 10 of 4,280