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Orthogonal frequency division multiple access-based cognitive radio networks with relaying capability
, Article IET Communications ; Volume 4, Issue 4 , 2010 , Pages 395-409 ; 17518628 (ISSN) ; Nasiri Kenari, M ; Sharif University of Technology
2010
Abstract
A novel orthogonal frequency division multiple access-based cognitive cooperative relaying scheme is proposed in which cognitive users assist primary users (PUs) by relaying their information. Both PUs and cognitive users communicate to a common base station. Based on the received feedback, cognitive users relay data of PUs. Two different schemes of relay assignment and power allocation are considered. Probability of error of PU and outage probabilities of both primary and cognitive users are investigated. Our analyses show substantial improvements in the probability of error and outage probability of PU while the outage probability of the cognitive user does not change significantly. We...
Performance and Analytical Discussion on OFDMA-Based Cognitive Radio Networks with Relaying Capabilities
, M.Sc. Thesis Sharif University of Technology ; Nasiri Kenar, Masoumeh (Supervisor)
Abstract
In this thesis, a novel OFDMA-based cognitive cooperative relaying scheme is proposed in which cognitive users not only try not to interfere with primary users but also assist them by relaying their information. Both primary users (PU) and cognitive users (CR) communicate to a common base station (BS). Bit error probability (BEP) of primary users and outage probability of primary users are investigated to evaluate performance of the primary users. In all parts of this thesis, we assume that data of users is not jointly encoded across subcarriers. So, the outage probability and BEP are investigated for each subcarrier independently. In the last part of the thesis, it is assumed that data is...
Multi-carrier based cooperative cognitive network
, Article IEEE Vehicular Technology Conference, 15 May 2011 through 18 May 2011 ; May , 2011 ; 15502252 (ISSN) ; 9781424483310 (ISBN) ; Mansourifard, P ; Nasiri Kenari, M ; Sharif University of Technology
2011
Abstract
In this paper, we propose a novel cognitive cooperative relaying scheme using multi-carrier transmission in which cognitive users assist primary users by relaying their information using Decode and Forward (DF) strategy. The best cognitive user is selected as a relay for a Primary User (PU). Outage probability of the PU is investigated. Our analyses show substantial improvements in the outage probability of the PU when using the proposed cooperative scheme compared to non-cooperative one. We also perform several simulations to corroborate our theoretical results