تصفح حسب المؤلف "Khakzad, Hamidreza"
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Adaptive hierarchical cooperative communication using energy harvesting relay
Khakzad, Hamidreza; Shakeri, Reza; Taherpour, Abbas; Khattab, Tamer (2013 , Conference Paper)In this paper, we present an adaptive wireless communication system with energy harvesting relay where, two sources wish to send data to a destination via an energy harvesting relay that utilizes hierarchical constellation. ... -
Dynamic interference-limited relay sharing in cognitive radio networks by using hierarchical modulation
Khakzad, Hamidreza; Taherpour, Abbas; Shakeri, Reza; Khattab, Tamer ( Institution of Engineering and Technology , 2017 , Article)Sharing a relay in cognitive radio (CR) networks in order to enhance the secondary user's (SU's) performance in an interference-limited scheme is investigated. It is assumed, by utilising hierarchical modulation, a shared ... -
Hybrid underlay/overlay cognitive radio system with hierarchical modulation in the presence of channel estimation error
Shaker, Reza; Khakzad, Hamidreza; Taherpour, Abbas; Khattab, Tamer; Hasna, Mazen Omar ( IEEE , 2014 , Conference Paper)In this paper, we study the performance of hybrid cognitive radio (CR) system in the presence of channel estimation error (CER) in terms of bit-error-probability (BEP) and outage probability. We assume simultaneous switching ... -
Impact of stochastic RF energy harvesting relay on wireless point-to-point network
Shakeri, Reza; Khakzad, Hamidreza; Taherpour, Abbas; Khattab, Tamer ( Institute of Electrical and Electronics Engineers Inc. , 2016 , Conference Paper)In this paper, we study a general practical stochastic energy harvesting (EH) model where in, an EH relay is able to harvest energy from the radio frequency (RF) radiation in a super capacitor. The different aspects of ... -
Multiuser scheduling on downlink communications by using adaptive hierarchical modulation
Khakzad, Hamidreza; Shakeri, Reza; Taherpour, Abbas; Khattab, Tamer ( Institute of Electrical and Electronics Engineers Inc. , 2015 , Conference Paper)In this paper, we propose a novel downlink system that is able to maximize the number of users which could be served with high correct decoding probability while, minimizing the total consumed energy for data reconstruction ... -
Optimal power allocation and relay selection in two-way multi-relay cooperative communication
Shakeri, Reza; Taherpour, Abbas; Khakzad, Hamidreza; Khattab, Tamer (2013 , Conference Paper)In this paper, we investigate the power allocation in two-way multi-relay assisted cooperative network in which the relays operate in decode-and-forward (DF) protocol. In the proposed method for choosing the best relay ...