Relevant bibliographies by topics / Cooperatie relay beamforming

Academic literature on the topic 'Cooperatie relay beamforming'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Cooperatie relay beamforming.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Cooperatie relay beamforming"

1

Ryu, Jong Yeol, and Jung Hoon Lee. "Trust Degree-Based MISO Cooperative Communications with Two Relay Nodes." Wireless Communications and Mobile Computing 2019 (January 1, 2019): 1–13. http://dx.doi.org/10.1155/2019/7927358.

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
2

Mahboobi, Behrad, Mehrdad Ardebilipour, Ashkan Kalantari, and Ehsan Soleimani-Nasab. "Robust Cooperative Relay Beamforming." IEEE Wireless Communications Letters 2, no. 4 (August 2013): 399–402. http://dx.doi.org/10.1109/wcl.2013.050613.130105.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Shukla, Aasheesh, Vishal Goyal, Puneet Mishra, and Vinay Kumar Deolia. "Cooperative relay beamforming in IDMA communication networks." Journal of Electrical Engineering 69, no. 4 (August 1, 2018): 300–304. http://dx.doi.org/10.2478/jee-2018-0042.

Full text
Abstract:
Abstract In this paper, a new combination of Interleave division multiple access (IDMA) and spatial diversity offered by cooperative relay aided distributed beam forming is proposed. In the offered scheme communication strategy consists two steps. All users broadcast their message to relays in the first step and then relays amplifies and forward the information to the desired destination. IDMA, which is popular non-orthogonal multiple access (NOMA) technique is used to combat the effect of multiple access interference (MAI) at relay as well as destination nodes. Each relay processed the signal to maintain the QoS of destination. The goal of this work is to find the appropriate beam forming weights by minimising the transmit power and without compromising the QoS in terms of SINR. However power minimization is not the convex problem, so semi-definite relaxation is used to modify the problem in to semi-definite programming (SDP) problem and the conventional SDP problem solver CVX is used for solution. The numerical explanation and simulation experiment of the proposed scheme shows the performance improvements in terms of bit error rate.
APA, Harvard, Vancouver, ISO, and other styles
4

Ghamari Adian, Mehdi. "Beamforming with Reduced Complexity in MIMO Cooperative Cognitive Radio Networks." Journal of Optimization 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/325217.

Full text
Abstract:
An approach for beamforming with reduced complexity in MIMO cooperative cognitive radio networks (MIMO-CCRN) is presented. Specifically, a suboptimal approach with reduced complexity is proposed to jointly determine the transmit beamforming (TB) and cooperative beamforming (CB) weight vectors along with antenna subset selection in MIMO-CCRN. Two multiantenna secondary users (SU) constitute the desired link, one acting as transmitter (SU TX) and the other as receiver (SU RX) and they coexist with single-antenna primary and secondary users. Some of single antenna secondary users are recruited by desired link as cooperative relay. The maximization of the achievable rates in the desired link is the objective of this work, provided to interference constraints on the primary users are not violated. The objective is achieved by exploiting transmit beamforming at SU TX, cooperation of some secondary users, and cooperative beamforming. Meanwhile, the costs associated with RF chains at the radio front end at SU RX are reduced. Through simulations, it is shown that better performance in the desired link is attained, as a result of cooperation of SUs.
APA, Harvard, Vancouver, ISO, and other styles
5

Cheng, Ruixia, Yu Tian, Junwen Zhu, and Yiwen Zhang. "Research on anti-jamming beamforming with multi-UAV relays." ITM Web of Conferences 45 (2022): 02006. http://dx.doi.org/10.1051/itmconf/20224502006.

Full text
Abstract:
As the common means of field emergency communication, the unmanned aerial vehicle (UAV) relay plays an important role in both civil and military fields. With the diversification of requirements and the limitations of single operation, multi-UAV cooperative work has attracted extensive attention. However, due to the UAV signal’s universality of broadcast and the limitation of power, information transmission is more likely to be interrupted. Therefore, in the presence of interference, this paper adopts forward amplification protocol under UAV relay transmission model. And two beamforming methods are proposed based on minimizing transmission power and maximizing communication rate of UAV relays. Then, we establish the power-constrained maximum security rate optimization problem with UAV relays, and deduce the corresponding beamforming weight vector and the optimal rate of safety. Finally, the simulation results show the effectiveness and accuracy of the proposed beamforming method.
APA, Harvard, Vancouver, ISO, and other styles
6

Han, Chun Lei, Mei Lu Lin, and Ye Yang. "Performance Analysis for Hybrid Cooperative Beamforming in Wireless Relay Networks." Applied Mechanics and Materials 543-547 (March 2014): 3435–40. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.3435.

Full text
Abstract:
This paper considers a relay-assisted hybrid cooperative beamforming system in independent and identically Rayleigh fading channels. In this system, each relay can adaptively employ amplify-and-forward (AF) or decode-and-forward (DF) protocol for maximizing the instantaneous signal-to-noise ratio (SNR). Tight upper and lower bounds for the outage probability have been derived in closed form, based on which we investigate the achievable diversity of the hybrid cooperative beamforming system. We also present the corresponding upper and lower bounds of the average channel capacity. Numerical results are provided to validate our theoretic analyses.
APA, Harvard, Vancouver, ISO, and other styles
7

Yu, Haiyang, Wei Duan, Qiang Sun, Xia Wang, Jue Wang, Jun Li, and Jaeho Choi. "Generalized Beamforming Design for Cooperative MIMO Multirelay Networks with Infinite Constraints and Imperfect CSI." Mathematical Problems in Engineering 2018 (2018): 1–8. http://dx.doi.org/10.1155/2018/9797549.

Full text
Abstract:
A generalized base station-relay-user equipment (BS-Relay-UE) beamforming design is investigated for a cooperative multiple-input multiple-output (MIMO) multirelay networks with imperfect channel state information (CSI). In order to minimize the worst-case mean square error (MSE) which is subject to a semi-infinite (SI) relay power constraints, a generalized optimal beamforming structure for the relay amplifying matrix is effectively proposed, and then the SI relay power constraints are converted into linear matrix inequalities (LMIs) version. In such conversion, the objective problem recasts as a decoupled biconvex semidefinite programming (SDP) one which can be efficiently solved by the proposed alternating algorithm. The system performance has been verified in terms of worst-case MSE using a set of qualitative analyses. The results show us that the proposed beamforming method outperforms the conventional schemes and can also effectively reduce the computational complexity when it is compared to the cutting-set schemes and also to the nonrobust ones.
APA, Harvard, Vancouver, ISO, and other styles
8

Zhu, Jinxin, and Jun Shao. "Outage Constraint Robust Cooperative Beamforming and Jamming Design for Secure AF Relay Networks." Mathematical Problems in Engineering 2021 (November 5, 2021): 1–7. http://dx.doi.org/10.1155/2021/5919617.

Full text
Abstract:
This paper investigates a joint robust scheme in a secrecy relay network where distributed relays perform cooperative beamforming and a friendly jammer transmits jamming signal to enhance the information security. Specifically, we consider the outage constraint secrecy rate maximization design with imperfect channel state information. Through semidefinite relaxation and one-dimensional search, we propose a two-layer optimization method to solve the nonconvex problem. In addition, the Bernstein-type inequality and large deviation inequality are utilized to convert the probabilistic constraint. Simulation results demonstrate the performance of the proposed design.
APA, Harvard, Vancouver, ISO, and other styles
9

Choi, Jinho. "MMSE-Based Distributed Beamforming in Cooperative Relay Networks." IEEE Transactions on Communications 59, no. 5 (May 2011): 1346–56. http://dx.doi.org/10.1109/tcomm.2011.030411.100158.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Ali, Sumayya, and K. M. Smitha. "Optimal Cooperative Beamforming Design for MIMO Relay Channels." Procedia Technology 24 (2016): 796–803. http://dx.doi.org/10.1016/j.protcy.2016.05.096.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Cooperatie relay beamforming"

1

Lanzarini, Matteo. "Distributed optimization methods for cooperative beamforming in satellite communications." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23246/.

Full text
Abstract:
This thesis analyzes various beamforming techniques and theories of space information networking (SIN), with the aim of merging and using them in real application. We propose then two algorithm to solve two different problem linked to satellites and beamforming. The first one show a cluster of satellites that performs collaborative beamforming to reach an Earth user, while reducing interference in secondary directions. Then we consider a problem for hybrid satellite-terrestrial relay networks (HSTRNs), where multiple geostationary satellites transmit signals to multiple Earth terminal, with the help of multiple single-antenna relays.
APA, Harvard, Vancouver, ISO, and other styles
2

Fazeli, Dehkordy Siavash. "Distributed Beamforming in Wireless Relay Networks." Thesis, 2008. http://hdl.handle.net/1974/1442.

Full text
Abstract:
In this thesis, we consider a wireless network consisting of d source-destination pairs and R relaying nodes. Each source wishes to communicate to its corresponding destination. By exploiting the spatial multiplexing capability of the wireless medium, we develop two cooperative beamforming schemes in order to establish wireless connections between multiple source-destination pairs through a collaborative relay network. Our first communication scheme consists of two steps. In the first step, all sources transmit their signals simultaneously to the relay network. As a result, each relay receives a noisy faded mixture of all source signals. In the second step, each relay transmits an amplitude- and phase-adjusted version of its received signal, i.e., the relay received signals are multiplied by a set of complex coefficients and are retransmitted. Our goal is to obtain these complex coefficients (beamforming weights) through minimization of the total relay transmit power while the signal-to-interference-plus-noise ratio at the destinations are guaranteed to be above certain pre-defined thresholds. Our second scheme is a distributed downlink beamforming technique which is performed in d + 1 successive time slots. In the first d time slots, the d sources transmit their data to the relay network successively. The relay nodes receive and store the noisy faded versions of the source signals. In the (d + 1)th time slot, the relays aim to collectively provide downlink connections to all d destinations. To do so, each relay transmits a linear combination of the stored signals received during the first d time slots. Again, our goal is to determine the complex weights (used at the relaying nodes to linearly combine the source signals) by minimizing the total relay transmit power while satisfying certain quality of services at the destinations. We use semi-definite relaxation to turn both problems into semi-definite programming (SDP) problems. Therefore, they can be efficiently solved using interior point methods. We showed that our proposed schemes significantly outperform orthogonal multiplexing schemes, such as time-division multiple access schemes, in a large range of network data rates.
Thesis (Master, Electrical & Computer Engineering) -- Queen's University, 2008-09-17 13:07:21.505
APA, Harvard, Vancouver, ISO, and other styles
3

Cho, Ting-Nan, and 卓庭楠. "Cooperative Beamforming with Multi-Relay Selection for Wireless Ad Hoc Networks." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/01701579738488645293.

Full text
Abstract:
碩士
國立清華大學
通訊工程研究所
98
Cooperative beamforming or collaborative beamforming is an energy-efficient cooperative diversity technique that cophases multiple received signals at the receiver to compensate the phase differences due to defferent propagation delays. With perfect synchronization, a deterministic mainlobe power level can be guaranteed at the inteneded direction for a given network topology. However, the sidelobes, depending on the relays’ positions as well as the weighting vectors, have probabilistic power levels over the angle domain. Moreover, a high power level sidelobe may cause an unacceptable interference level at an unintended receiver. Thus, limiting the sidelobes to meet some requirements is of importance in cooperative beamforming. In this thesis, we develop a two-step multi-relay selection scheme for cooperative conventional beamforming based on a selection vector design. We formulate an optimization problem that minimizes the average power over all unintended directions with a constraint of unit power gain pointing to the desired user. Using the Lagrange multiplier, we further reduce the optimization problem as an eigenvalue decomposition problem. The solution is then used to form two selection criteria, where the first one is for finding the optimal reference relay and the second one is for selecting the optimal relaying set for cooperative conventional beamforming according to the reference relay. The proposed relay selection method provides a reduced-complexity, suboptimal solution for cooperative beamforming, where the receiver selects a set of cooperating relays by broadcasting a binary feedback message. Simulation results show that the proposed multi-relay selection scheme provides lower average power over all unintended directions than both the near and far cases, where the performance is close to that of the exhaustive search approach.
APA, Harvard, Vancouver, ISO, and other styles
4

Yung-JenChen and 陳詠任. "Relay Selection Scheme for Cooperative Cognitive Radio Networks With Beamforming Technique." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/37606499651060383471.

Full text
Abstract:
碩士
國立成功大學
電腦與通信工程研究所
101
The cognitive radio (CR) network has become a featuring technique due to the lack of spectrum. By applying dynamic spectrum allocation schemes, the secondary users (SUs) can utilize the spectrum holes more flexibly and achieve better performance and efficiency. With the help of cooperative relaying, the SUs can overcome the throughput loss due to the error-prone wireless fading channel. In this thesis, adaptive spatial multiplexing is designed to access the spatial spectrum holes (SSH) to guarantee the throughputs of PUs. We consider a cooperative CR network that the SU network is surrounded by PU receivers, and the goal is to choose the best relays that benefit the whole system. By modifying the projected-singular decomposition value (P-SVD) and the number-based algorithm (NBA) relay selection scheme, we propose an adaptive null space (ANS) relay selection scheme in order to transmit even when the number of surrounding PUs is equal to the number of SU transmit antennas and to choose the relay with the least channel gain from SU transmitters to PU receivers which suffer interference from SU transmitters. To define the total performance of both PUs and SUs, we introduce a factor called CI ratio which is a ratio of the capacity of SUs to the interference to PUs. Obviously, the more CI ratio the system has, the better performance is achieved. Simulation results show that the ANS scheme is close to the NBA scheme in terms of average end-to-end capacity of SUs and outperforms the NBA scheme in terms of CI ratios.
APA, Harvard, Vancouver, ISO, and other styles
5

Zhao, Yi. "Cooperative networks with multiple relays: Selection, repetition and beamforming." 2008. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=742566&T=F.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Oveis, Gharan Shahab. "Diversity Multiplexing Tradeoff and Capacity Results in Relayed Wireless Networks." Thesis, 2010. http://hdl.handle.net/10012/5179.

Full text
Abstract:
This dissertation studies the diversity multiplexing tradeoff and the capacity of wireless multiple-relay network. In part 1, we study the setup of the parallel Multi-Input Multi-Output (MIMO) relay network. An amplify-and-forward relaying scheme, Incremental Cooperative Beamforming, is introduced and shown to achieve the capacity of the network in the asymptotic case of either the number of relays or the power of each relay goes to infinity. In part 2, we study the general setup of multi-antenna multi-hop multiple- relay network. We propose a new scheme, which we call random sequential (RS), based on the amplify-and-forward relaying. Furthermore, we derive diversity- multiplexing tradeoff (DMT) of the proposed RS scheme for general single-antenna multiple-relay networks. It is shown that for single-antenna two-hop multiple- access multiple-relay (K > 1) networks (without direct link between the source(s) and the destination), the proposed RS scheme achieves the optimum DMT. In part 3, we characterize the maximum achievable diversity gain of the multi- antenna multi-hop relay network and we show that the proposed RS scheme achieves the maximum diversity gain. In part 4, RS scheme is utilized to investigate DMT of the general multi-antenna multiple-relay networks. First, we study the case of a multi-antenna full-duplex single-relay two-hop network, for which we show that the RS achieves the optimum DMT. Applying this result, we derive a new achievable DMT for the case of multi-antenna half-duplex parallel relay network. Interestingly, it turns out that the DMT of the RS scheme is optimum for the case of multi-antenna two parallel non-interfering half-duplex relays. Furthermore, we show that random unitary matrix multiplication also improves the DMT of the Non-Orthogonal AF relaying scheme in the case of a multi-antenna single relay channel. Finally, we study the general case of multi-antenna full-duplex relay networks and derive a new lower-bound on its DMT using the RS scheme. Finally, in part 5, we study the multiplexing gain of the general multi-antenna multiple-relay networks. We prove that the traditional amplify-forward relaying achieves the maximum multiplexing gain of the network. Furthermore, we show that the maximum multiplexing gain of the network is equal to the minimum vertex cut-set of the underlying graph of the network, which can be computed in polynomial time in terms of the number of network nodes. Finally, the argument is extended to the multicast and multi-access scenarios.
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Cooperatie relay beamforming"

1

Zhang, Yizhen, Guobing Li, Guomei Zhang, and Gangming Lyu. "Cooperative Beamforming and Artificial Noise Design for Secure Multi-pair Communications in Wireless Two-Way Relay Networks." In Wireless Algorithms, Systems, and Applications, 735–44. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-21837-3_72.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Cooperatie relay beamforming"

1

Chatzipanagiotis, Nikolaos, Athina Petropulu, and Michael M. Zavlanos. "A distributed algorithm for cooperative relay beamforming." In 2013 American Control Conference (ACC). IEEE, 2013. http://dx.doi.org/10.1109/acc.2013.6580418.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

El-Keyi, Amr, and Benoit Champagne. "Cooperative MIMO-beamforming for multiuser relay networks." In ICASSP 2008 - 2008 IEEE International Conference on Acoustics, Speech and Signal Processing. IEEE, 2008. http://dx.doi.org/10.1109/icassp.2008.4518218.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Ramezani-Kebrya, Ali, Min Dong, Ben Liang, Gary Boudreau, and Ronald Casselman. "Optimal cooperative relay beamforming for interference minimization." In 2015 IEEE International Conference on Signal Processing for Communications (ICC). IEEE, 2015. http://dx.doi.org/10.1109/icc.2015.7248700.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Huang, Yupeng, Liyan Li, Ming-Min Zhao, and Min-Jian Zhao. "Joint Relay Clustering and Beamforming Design for Cooperative Relay Networks." In 2021 IEEE 94th Vehicular Technology Conference (VTC2021-Fall). IEEE, 2021. http://dx.doi.org/10.1109/vtc2021-fall52928.2021.9625426.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Yang, Zilong, and Min Dong. "Low-complexity cooperative relay beamforming for multi-cluster relay interference networks." In 2016 IEEE 17th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC). IEEE, 2016. http://dx.doi.org/10.1109/spawc.2016.7536882.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Singh, Sudhir, Paul D. Teal, Pawel A. Dmochowski, and Alan J. Coulson. "Robust cooperative relay beamforming for cognitive radio networks." In 2016 Australian Communications Theory Workshop (AusCTW). IEEE, 2016. http://dx.doi.org/10.1109/ausctw.2016.7433655.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Choi, Jinho, and Jeongseok Ha. "MMSE-based distributed beamforming in cooperative relay networks." In 2011 IEEE 54th International Midwest Symposium on Circuits and Systems (MWSCAS). IEEE, 2011. http://dx.doi.org/10.1109/mwscas.2011.6026480.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Chen, X., S. H. Song, and K. B. Letaief. "Transmit and Cooperative Beamforming in Multi-Relay Systems." In ICC 2010 - 2010 IEEE International Conference on Communications. IEEE, 2010. http://dx.doi.org/10.1109/icc.2010.5502421.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Yi, Tao, Li Guo, Kai Niu, Hongyan Cai, Jiaru Lin, and Wenbao Ai. "Cooperative beamforming in cognitive radio network with hybrid relay." In 2012 19th International Conference on Telecommunications (ICT). IEEE, 2012. http://dx.doi.org/10.1109/ictel.2012.6221214.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Talebi, Arash, and Witold A. Krzymien. "Multiple-Antenna Multiple-Relay Cooperative Communication System with Beamforming." In 2008 IEEE Vehicular Technology Conference (VTC 2008-Spring). IEEE, 2008. http://dx.doi.org/10.1109/vetecs.2008.521.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Cooperatie relay beamforming' for particular source types:
Journal articles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography