Performance Analysis of Collaborative Beamforming With Outdated CSI for Multi-Relay Spectrum Sharing Networks

Hu, Zhenzhen; Cheng, Julian; Zhang, Zhongpei; Liang, Ying-Chang

doi:10.1109/tvt.2018.2872877

Cited by 19 publications

(17 citation statements)

References 36 publications

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“…The second constraint T 2 normalizes the beamforming weight. Now, using the projection matrix theory, the optimal weight vectorw ZF can be marked as [7] w…”

Section: In the Alice→relay Linkmentioning

confidence: 99%

“…Thus, in this work, we will primarily focus on the physical layer secrecy performance of an underlay CRN. In an effort to further improve PLS of wireless transmissions, several techniques were proposed, such as collaborative zero-forcing beamforming (ZFB) [7]- [9], cooperative relays [4], [10]- [11] and full-duplex (FD) techniques [12]- [13]. First, for a CRN, beamforming can be used not only to eliminate the interference from the secondary transmitter to the PU, but also to improve the secrecy performance of the system due to the more concentrated power to the secondary destination.…”

Section: Introductionmentioning

confidence: 99%

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Secure Transmission in Cognitive Radio Networks using Full-duplex Technique with Outdated CSI

Shang¹,

Zhang²,

Wu³

et al. 2020

Preprint

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In this paper, we investigate the effects of the outdated channel state information (CSI) on the secrecy performance of an underlay spectrum sharing cognitive radio networks (CRNs) with full-duplex (FD) receivers. Legitimate destination node (Bob) acts as a FD node, transmitting interference signals to a passive eavesdropping node (Eve) while receiving signals. To exploit the benefits of collaborative zero-forcing beamforming and FD technologies, transmit antenna selection-maximal-ratio combining-zero forcing beamforming/maximal-ratio transmission-selection combining-zero forcing beamforming (TAS-MRC-ZFB/MRT-SC-ZFB) scheme is considered at the secondary user transmission link with the outdated CSI and collaborative ZFB is adopted at FD destination node, which tries to improve the transmission efficiency of our considered CRNs. Specifically, in order to evaluate the proposed scheme, the derivation of analytical expression in exact and the high asymptotic closed-form expressions of secrecy outage probability (SOP) are provided of the considered network with and without feedback delay of the CSI. Furthermore, the impact of delay on the second user transmission and interference links of the primary user (PU) node is investigated. The results reveal that outdated CSI of secondary user transmission and collaborative ZFB channels deteriorates the SOP, and the outdated CSI between PU and SU will affect the power margin factors for the secondary transmitter. Furthermore, we also study the effects of different system parameters on the secrecy diversity order and secrecy array gain. The proposed scheme is compared with the existing TAS-MRC/TAS-MRC scheme to verify the improvement of system performance. Finally, Monte Carlo simulations verify the correctness of our theoretical analysis.

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“…The second constraint T 2 normalizes the beamforming weight. Now, using the projection matrix theory, the optimal weight vectorw ZF can be marked as [7] w…”

Section: In the Alice→relay Linkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Secure Transmission in Cognitive Radio Networks using Full-duplex Technique with Outdated CSI

Shang¹,

Zhang²,

Wu³

et al. 2020

Preprint

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“…There are two reasonable aspects to explain this phenomenon. In the first place, the continuous growth of wireless access terminals leads to severe shortages and competition for spectrum resources [1,2]. Secondly, the fixed spectrum allocation mechanism of the licensed spectrum further results in poor spectrum utilization, which is called spectrum under-utilization [3,4].…”

Section: Introductionmentioning

confidence: 99%

Spectrum-Efficient Resource Allocation in Multi-Radio Multi-Hop Cognitive Radio Networks

Han

Luo

Zeng

et al. 2019

Sensors

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The multi-hop cognitive radio network (CRN) has attracted much attention in industry and academia because of its seamless wireless coverage by forming multi-hop links and high spectrum utilization of cognitive radio (CR) technology. Using multi-slot statistical spectrum status information (SSI), this work investigates the average spectrum efficiency (SE) of a multi-radio multi-hop (MRMH) CRN where each hop is permitted to use different spectra and long-distance hops can reuse the same idle primary user (PU) spectrum. Faced with the modeled SE problem, which is a complex non-convex fractional mixed integer nonlinear programming (MINLP) problem, the optimal spectrum and power allocation for multi-hop links in multi-slot and multi-channel scenarios can be obtained with the proposed successive multi-step convex approximation scheme (SMCA). As shown through computational complexity and simulation analysis, SMCA can obtain an approximate lower bound of the optimal solution for the modeled SE problem with a lower computational cost. Furthermore, some potential relationships between network performance and spectrum idle rate can be easily discussed with SMCA, which can provide some sensible deployment strategies for the MRMH CRN in future multi-slot scenarios.

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“…Cooperative relaying can enhance the communication performance through sharing antennas with neighboring users [7,8]. Combining cooperative relaying with cognitive radio will enable effective improvement of the spectrum sharing performance [9,10,11,12,13,14,15]. An opportunistic spectrum sharing protocol in OFDM relaying network is proposed in [9], in which the cognitive system gains spectrum access by amplifying and forwarding the primary signal.…”

Section: Introductionmentioning

confidence: 99%

“…Reference [10] proposed OFDM two-way relaying cooperative spectrum sharing, in which the cognitive relay uses disjoint subcarriers to help forward the primary signals. Reference [13] analyzed performance of multi-relay collaborative spectrum sharing with incomplete CSI information, where cognitive users utilize collaborative zero-forcing beamforming. Through relaying the signal of the primary user, the cognitive user can obtain spectrum access.…”

Section: Introductionmentioning

confidence: 99%

Subcarrier Allocation Based Cooperative Spectrum Sharing with Wireless Energy Harvesting in OFDM Relaying Networks

Huang

Hou

2019

Sensors

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In this paper, we propose subcarrier allocation based cooperative spectrum sharing protocol for OFDM relaying networks with wireless energy harvesting. In the proposed protocol, the cognitive relay node utilizes different subcarriers to forward the primary information to obtain the spectrum access for the cognitive system transmission. The primary system consists of two parts, a primary transmitter (PT) and primary receiver (PR), and cognitive system includes a cognitive source node (CSN), cognitive destination node (CDN) and cognitive relay node (CRN). In the first phase, CRN splits a fraction of the power received from the PT and CSN transmission to decode information, while the remaining power is used for energy harvesting. Then CRN uses disjoint subcarriers to forward the signals of PT and CSN by utilizing the harvested energy in the second phase. Three parameters which consist of power splitting ratio, power allocation and subcarriers allocation are optimized in our algorithm to maximize the cognitive transmission rate with the constraint of primary target transmission rate. Numerical and simulation results are shown to give useful insights into the proposed cooperative spectrum sharing protocol, and we also found that various system parameters have a great effect for the simulation results.

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Performance Analysis of Collaborative Beamforming With Outdated CSI for Multi-Relay Spectrum Sharing Networks

Cited by 19 publications

References 36 publications

Secure Transmission in Cognitive Radio Networks using Full-duplex Technique with Outdated CSI

Secure Transmission in Cognitive Radio Networks using Full-duplex Technique with Outdated CSI

Spectrum-Efficient Resource Allocation in Multi-Radio Multi-Hop Cognitive Radio Networks

Subcarrier Allocation Based Cooperative Spectrum Sharing with Wireless Energy Harvesting in OFDM Relaying Networks

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