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In this paper, we propose an energy-harvesting based decode-and-forward multi-hop cognitive relay protocol, where secondary users harvest energy from the radio frequency signals transmitted by multiple dedicated power beacons (PBs) to support the information transmission. The secondary transmitters including source and relays must adjust their transmit power to satisfy interference power constraints...
Radio over fiber signal generation by an ultra-fast wavelength-tunable laser under wavelength-division-multiplexing configuration is demonstrated for radio signal delivery to remote sites in a linear-cell-based distributed antenna system. Application to linear-cell train communication system is discussed.
In this paper, we analyze the downlink outage performance of opportunistic scheduling in dual-hop fixed-gain amplify-and-forward (FG-AF) cooperative networks consisting of one source, multiple radio-frequency (RF) energy harvesting relays, and multiple destinations. To this end, a relay-destination selection scheme named direct links plus opportunistic channel state information (CSI)-based selection...
In this paper, we consider a cognitive two-way relay system with multiple relay nodes and multiple primary receivers over Nakagami-m fading channels. Relay nodes process signal following selective decode-and-forward (DF) relay technique. The opportunistic relay selection is used to choose the best relay. We derive the exact closed-form expression of the overall outage probability over Nakagami-m fading...
In this paper, we study physical-layer security (PLS) issue in underlay cognitive radio (UCR) networks in presence of multiple primary users (PUs). In particular, we propose three relay selection methods that take the interference constraint into account to improve the reliability of the data transmission as well as to reduce the data rate received at eavesdroppers. The main contribution of this work...
In this paper, we study two important secure performance metrics of cluster-based multihop relaying networks under the presence of eavesdropper with imperfect main channel estimation. At each hop, partial relay selection is used to improve secure performance. In particular, we derive the system secure outage probability and the probability of non-zero secrecy capacity over Rayleigh fading channels,...
In this paper, we study the reliability-security tradeoff for a secondary network in an underday cognitive radio (CR) environment. In the proposed protocol, a secondary transmitter (ST) transmits its data to a secondary receiver (SR) in presence of a secondary eavesdropper (SE) that tries to overhear the ST data. Moreover, a secondary jammer (SJ) that harvests energy from the radio frequency (RF)...
In this paper, we consider an incremental cooperative relaying network (IR-CRN), where a relay node harvests the radio energy from the source signal using the time-switching mechanism. Specif cally, we propose a scheme named as IR-CRN which enhances spatial diversity gain by utilizing the incremental relaying protocol. The destination node of the IR-CRN scheme employs maximal ratio combining (MRC)...
This paper is concerned with the joint estimation of phase noise and time-varying channel responses in full-duplex multiple-input multiple-output (MEMO) orthogonal frequency division multiplexing (OFDM) systems. The time-variation of phase noise and multipath MIMO channel responses gives rise to the identiflability problem of estimating a large number of unknowns which is much greater than the number...
In this paper, we propose a partial relay selection protocol using decode-and-forward non-linear energy harvesting model. For performance evaluation, we derive an analytical expression of outage probability for the proposed protocol over Rayleigh fading channels. Monte Carlo simulations are then performed to verify the theoretical results. The results present the efficiency of the relay selection...
This paper investigates impact of hardware impairments on the probability of Non-zero Secrecy Capacity (NSC) of multi-hop relay networks. In the considered protocol, multiple eavesdroppers attempt to overhear the data that is relayed from a source to a destination via multiple intermediate relay nodes. To enhance the secrecy performance, the multi-hop randomize-and-forward (RF) strategy is used to...
In this paper, we derive the secure outage probability for secure distributed switch-and-stay combining (DSSC) networks over Rayleigh fading channels. Monte Carlo simulations are performed to verify the analysis and to confirm the secure advantage of the proposed DSSC networks over secure direct transmission and secure incremental relay networks.
Performance of dual-hop decode-and-forward (DF) relaying networks employing a limited-energy relay antenna with transmit antenna selection (TAS) for the first hop and maximal ratio combining (MRC) for the second hop is studied. Specifically, a closed-form expression for the system outage probability over uncorrelated Nakagami-m fading channels is derived. Detailed simulation results are given.
In this paper, we evaluate performances of various transmit antenna selection (TAS) protocols in underlay cognitive radio network under impact of hardware impairments. In particular, a secondary base station (SB) selects one of available antennas to transmit its data to a secondary user (SU) that randomly appears in radio range of the SB. In the first proposed scheme (named RAND), the SB randomly...
In this paper, we propose an energy harvestingbased jamming scheme to enhance secrecy outage probability (SOP) for cooperative relaying protocols. In the proposed scheme, one of available relays is selected to forward data from a source to a destination, while an energy-constrained relay harvests energy from the source’s radio frequency signals to generate artificial noise to an eavesdropper. Moreover,...
In this paper, we evaluate outage probability of dual- hop cooperative cognitive networks under impact of hardware impairment. In particular, we propose two relay selection meth- ods to compensate the performance loss due to the imperfect hardware and the interference constraint at primary network. In the first proposed method, named PRO, the best secondary relay is selected by relying on the channel...
In this paper, we propose an energy harvesting-based spectrum access model in overlay cognitive radio (CR). In the proposed scheme, one of potential secondary transmitters (STs) is selected to help a primary transmitter (PT) forward primary signals to a primary receiver (PR). The chosen ST harvests energy from the PT's signals to serve the PT-PR communication as well as find opportunities to access...
Relaying transmission enables the high performance of wireless communication systems. Therefore, many researches have investigated this technique. However, most of the studies supposed the ideal-hardware and ignored the co-channel interference. For accuracy design, it highly motivates to account for hardware impairment and interference in analyzing relaying systems. In this paper, we model the multi-hop...
In this paper, we investigate two partial relay selection (PRS) protocols in underlay cognitive radio under impact of hardware impairment. In particular, the re-active and pro-active PRS schemes are proposed to compensate the performance loss due to the hardware noises and the interference constraints required by multiple primary users (PUs). Moreover, incremental relaying technique is also used to...
In this paper, we consider a dual-hop decode-and-forward (DF) relaying network, where relays operate based on harvested energy from radio frequency (RF) radiation. Considering time switching-based relaying mechanism, we propose a relay selection protocol, where the relay having the highest harvested energy will forward the received signal towards the destination. We investigate the system performance...
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