A New Relay Selection Strategy under Interference Temperature Constraint

The implementation of cooperative diversity with relays has advantages over point-to-point multiple-input multiple-output (MIMO) systems, in particular, overcoming correlated paths due to small inter-element spacing. A simple transmitter with one antenna may exploit cooperative diversity or space time coding gain through distributed relays. In this paper, similar distributed transmission is considered with the golden code, and the authors propose a new strategy for relay selection, called the maximum-mean selection policy, for distributed transmission with the full maximum-likelihood (ML) decoding and sphere decoding (SD) based on a wireless relay network. This strategy performs a channel strength tradeoff at every relay node to select the best two relays for transmission. It improves on the established one-sided selection strategy of maximum-minimum policy. Simulation results comparing the bit error rate (BER) based on different detectors and a scheme without relay selection, with the maximum-minimum and maximum-mean selection schemes confirm the performance advantage of relay selection. The proposed strategy yields the best performance of the three methods.

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On the Performance of Random Cognitive mmWave Sensor Networks

Sensors ◽

10.3390/s19143184 ◽

2019 ◽

Vol 19 (14) ◽

pp. 3184 ◽

Cited By ~ 1

Author(s):

Yi Song ◽

Weiwei Yang ◽

Zhongwu Xiang ◽

Biao Wang ◽

Yueming Cai

Keyword(s):

Sensor Node ◽

Signal Beam ◽

Closed Form Expression ◽

Primary Sensor ◽

Interference Temperature ◽

Secondary Network ◽

Propagation Law ◽

Temperature Constraint ◽

Power Region ◽

Guard Zone

This paper investigates the secrecy performance of a cognitive millimeter wave (mmWave) wiretap sensor network, where the secondary transmitter (SU-Tx) intends to communicate with a secondary sensor node under the interference temperature constraint of the primary sensor node. We consider that the random-location eavesdroppers may reside in the signal beam of the secondary network, so that confidential information can still be intercepted. Also, the interference to the primary network is one of the critical issues when the signal beam of the secondary network is aligned with the primary sensor node. Key features of mmWave networks, such as large number of antennas, variable propagation law and sensitivity to blockages, are taken into consideration. Moreover, an eavesdropper-exclusion sector guard zone around SU-Tx is introduced to improve the secrecy performance of the secondary network. By using stochastic geometry, closed-form expression for secrecy throughput (ST) achieved by the secondary sensor node is obtained to investigate secrecy performance. We also carry out the asymptotic analysis to facilitate the performance evaluation in the high transmit power region. Numerical results demonstrate that the interference temperature constraint of the primary sensor node enables us to balance secrecy performance of the secondary network, and provides interesting insights into how the system performance of the secondary network that is influenced by various system parameters: eavesdropper density, antenna gain and sector guard zone radius. Furthermore, blockages are beneficial to improve ST of the secondary sensor node under certain conditions.

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Trust Degree-Based MISO Cooperative Communications with Two Relay Nodes

Wireless Communications and Mobile Computing ◽

10.1155/2019/7927358 ◽

2019 ◽

Vol 2019 ◽

pp. 1-13 ◽

Cited By ~ 1

Author(s):

Jong Yeol Ryu ◽

Jung Hoon Lee

Keyword(s):

Cooperative Communications ◽

Relay Selection ◽

Cooperative Transmission ◽

Achievable Rate ◽

Selection Strategy ◽

Relay Nodes ◽

Transmission Strategy ◽

Single Output ◽

Multiple Input ◽

Channel Conditions

In this paper, we propose transmission strategies in multiple-input-single-output (MISO) cooperative communications with two relay nodes in cases when the relay nodes have different trust degrees, where the trust degrees represent how much the relay nodes can be trusted for cooperation. For the given trust degrees and channel conditions, we first derive a relay selection strategy that maximizes the expected achievable rate. We then propose a cooperative transmission strategy of relays with an optimal cooperative beamforming vector that maximizes the expected achievable rate, which is a linear combination of weighted channel vectors. Finally, we derive the optimal transmission strategy, which is a mixed strategy between the relay selection and cooperative transmission strategies with respect to the trust degrees. Our analysis and numerical results show that the proposed transmission strategies increase the expected achievable rate by exploiting the trust degrees of the relay nodes, along with the channel conditions.

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Relay Selection Strategy (RSS) Design for In-Vehicle Storage (IVS) System

2019 IEEE Global Communications Conference (GLOBECOM) ◽

10.1109/globecom38437.2019.9013529 ◽

2019 ◽

Author(s):

Binbin Hu ◽

Rongqing Zhang ◽

Luoyang Fang ◽

Xiang Cheng ◽

Liuqing Yang

Keyword(s):

Relay Selection ◽

Selection Strategy

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BER-based relay selection strategy for cooperative communication

Journal of Systems Engineering and Electronics ◽

10.23919/jsee.2020.000022 ◽

2020 ◽

Vol 31 (4) ◽

pp. 685-691

Author(s):

Yang Peiyao ◽

Li Hai ◽

Hou Shujuan ◽

Yang Liuqing

Keyword(s):

Cooperative Communication ◽

Relay Selection ◽

Selection Strategy

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An improved scheme for large scale complex field network coding based on user clustering and relay selection strategy in wireless cooperative communication

2016 8th IEEE International Conference on Communication Software and Networks (ICCSN) ◽

10.1109/iccsn.2016.7587210 ◽

2016 ◽

Author(s):

Yuwen Huang ◽

Zhanji Wu ◽

Chengxin Jiang ◽

Kun Lu

Keyword(s):

Network Coding ◽

Cooperative Communication ◽

Relay Selection ◽

Large Scale ◽

Selection Strategy ◽

Complex Field ◽

User Clustering ◽

Complex Field Network Coding ◽

Field Network

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The sequence relay selection strategy based on stochastic dynamic programming

Modern Physics Letters B ◽

10.1142/s0217984917400760 ◽

2017 ◽

Vol 31 (19-21) ◽

pp. 1740076

Author(s):

Rui Zhu ◽

Xihao Chen ◽

Yangchao Huang

Keyword(s):

Stochastic Dynamic Programming ◽

Relay Selection ◽

Relay Node ◽

Selection Strategy ◽

Stochastic Dynamic ◽

Channel State ◽

State Information ◽

Convergence Performance ◽

Relay Node Selection ◽

Stochastic Dynamic Program

Relay-assisted (RA) network with relay node selection is a kind of effective method to improve the channel capacity and convergence performance. However, most of the existing researches about the relay selection did not consider the statically channel state information and the selection cost. This shortage limited the performance and application of RA network in practical scenarios. In order to overcome this drawback, a sequence relay selection strategy (SRSS) was proposed. And the performance upper bound of SRSS was also analyzed in this paper. Furthermore, in order to make SRSS more practical, a novel threshold determination algorithm based on the stochastic dynamic program (SDP) was given to work with SRSS. Numerical results are also presented to exhibit the performance of SRSS with SDP.

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Power Optimized Single Relay Selection with an Improved Link-Adaptive-Regenerative Protocol

Journal of Electrical and Computer Engineering ◽

10.1155/2018/8364594 ◽

2018 ◽

Vol 2018 ◽

pp. 1-8

Author(s):

Jie Li ◽

Jianrong Bao ◽

Shenji Luan ◽

Bin Jiang ◽

Chao Liu

Keyword(s):

Outage Probability ◽

Cooperative Communications ◽

Power Efficiency ◽

Relay Selection ◽

Relay Node ◽

Link Quality ◽

Selection Strategy ◽

Amplify And Forward ◽

Selection Scheme ◽

Single Relay

To improve the reliability and efficiency in cooperative communications, a power optimized single relay selection scheme is proposed by increasing the diversity effort with an improved link-adaptive-regenerative (ILAR) protocol. The protocol determines the forwarding power of a relay node by comparing the signal-to-noise ratio (SNR) at both sides of the node; thus it improves the power efficiency. Moreover, it also proposes a single relay selection strategy to maximize the instantaneous SNR product, which ensures the approximate best channel link quality for good relay forwarding. And the system adjusts the forwarding power in real time and also selects the best relay node participated in the cooperative forwarding. In addition, the cooperation in the protocol is analyzed and the approximate expression of the bit-error-rate (BER) and the outage probability at high SNRs are also derived. Simulation results indicate that the BER and outage probability of the relay selection scheme by the ILAR protocol outperform other contrast schemes of current existing protocols. At BER of 10−2, the proposed scheme with ILAR protocol outperforms those of the decoded-and-forward (DF), the selected DF (SDF), and the amplify-and-forward (AF) protocols by 3.5, 3.5 and 7 dB, respectively. Moreover, the outage probability of the relay system decreases with the growth of the relay number. Therefore, the proposed relay selection scheme with ILAR strategies can be properly used in cooperative communications for good reliability and high power efficiency.

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