Results 1 - 10 of 307

Random Beamforming in Correlated MISO Channels for Multiuser Systems

by Andreas Senst, Peter Schulz-rittich, Ulrich Krause, Gerd Ascheid, Heinrich Meyr - IEEE ICC , 2004
"... Abstract — We examine the technique of random beamforming to exploit multiuser diversity in the downlink of a wireless cellular communication system with an antenna array at the basestation. In random beamforming systems, the scalar signal is multiplied by a weight vector and the resulting signal ve ..."
Abstract - Cited by 3 (0 self) - Add to MetaCart
Abstract — We examine the technique of random beamforming to exploit multiuser diversity in the downlink of a wireless cellular communication system with an antenna array at the basestation. In random beamforming systems, the scalar signal is multiplied by a weight vector and the resulting signal

Analytical study of connectivity in wireless ad hoc networks with random beamforming

by Xiangyun Zhou, Salman Durrani, Haley M. Jones - In Proc. Int. Conf. on Signal Processing and Communication Systems (ICSPCS), Gold , 2007
"... Abstract — Random beamforming is a technique in which each node in a wireless ad hoc network directs its main beam in a randomly chosen direction. This paper presents an analytical method for investigating the effect of random beamforming on the connectivity of wireless ad hoc networks. We derive an ..."
Abstract - Cited by 5 (1 self) - Add to MetaCart
Abstract — Random beamforming is a technique in which each node in a wireless ad hoc network directs its main beam in a randomly chosen direction. This paper presents an analytical method for investigating the effect of random beamforming on the connectivity of wireless ad hoc networks. We derive

Multi-Cell User-Scheduling and Random Beamforming Strategies For Downlink Wireless Communications

by Xiaojun Tang, Sean A. Ramprashad, Haralabos Papadopoulos
"... Abstract—We consider random beamforming and user scheduling strategies in a multi-cell environment for downlink wireless communications. Our focus is on using combined scheduling and beamforming to mitigate performance losses due to inter-cell interference. Of interest are strategies requiring minim ..."
Abstract - Cited by 4 (0 self) - Add to MetaCart
Abstract—We consider random beamforming and user scheduling strategies in a multi-cell environment for downlink wireless communications. Our focus is on using combined scheduling and beamforming to mitigate performance losses due to inter-cell interference. Of interest are strategies requiring

Random Beamforming in Spatially Correlated Multiuser MISO Channels

by Jae-yun Ko, Yong-hwan Lee
"... Abstract- In this paper, we propose a new beamforming scheme that generates beams by exploiting the spatial correlation in multiuser environments. The proposed scheme generates random beams using eigenvectors corresponding to dominant eigenvalues of the channel covariance matrix, increasing the mult ..."
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Abstract- In this paper, we propose a new beamforming scheme that generates beams by exploiting the spatial correlation in multiuser environments. The proposed scheme generates random beams using eigenvectors corresponding to dominant eigenvalues of the channel covariance matrix, increasing

Random Beamforming over Correlated Fading Channels

by Jakob Hoydis, Romain Couillet, Mérouane Debbah , 2011
"... We study a multiple-input multiple-output (MIMO) multiple access channel (MAC) from several multi-antenna transmitters to a multi-antenna receiver. The fading channels between the transmitters and the receiver are modeled by random matrices, composed of independent column vectors with zero mean and ..."
Abstract - Cited by 2 (2 self) - Add to MetaCart
We study a multiple-input multiple-output (MIMO) multiple access channel (MAC) from several multi-antenna transmitters to a multi-antenna receiver. The fading channels between the transmitters and the receiver are modeled by random matrices, composed of independent column vectors with zero mean

How does randomized beamforming improve the connectivity of ad hoc networks

by Christian Bettstetter, Christian Hartmann, Clemens Moser - in In Proceedings of the IEEE International Conference on Communications (ICC), Seoul, Korea , 2005
"... Abstract—This paper analyzes the impact of beamforming antennas on the topological connectivity of multihop wireless networks. As a metric for the connectivity of the network, we use the percentage P (path) of nodes that are connected via a multihop path. We show that simple randomized beamforming — ..."
Abstract - Cited by 28 (2 self) - Add to MetaCart
Abstract—This paper analyzes the impact of beamforming antennas on the topological connectivity of multihop wireless networks. As a metric for the connectivity of the network, we use the percentage P (path) of nodes that are connected via a multihop path. We show that simple randomized beamforming

Beam Selection Strategies for Orthogonal Random Beamforming in Sparse Networks

by Jose Lopez Vicario, Roberto Bosisio, Carles Anton-haro, Senior Member, Umberto Spagnolini, Senior Member
"... Abstract—Orthogonal random beamforming (ORB) consti-tutes a mean to exploit spatial multiplexing and multi-user diversity (MUD) gains in multi-antenna broadcast channels. To do so, as many random beamformers as transmit antennas (M) are generated and on each beam the user experiencing the most favor ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
Abstract—Orthogonal random beamforming (ORB) consti-tutes a mean to exploit spatial multiplexing and multi-user diversity (MUD) gains in multi-antenna broadcast channels. To do so, as many random beamformers as transmit antennas (M) are generated and on each beam the user experiencing the most

Single User Random Beamforming in Gaussian MIMO Broadcast Channels

by Youngjae Kim, Kee-bong Song, Ravi Narasimhan, John M. Cioffi
"... Abstract — This paper proposes a new transmitting scheme for a multi-antenna (MIMO) Gaussian broadcast channel. The transmitter exploits multiuser diversity using a small amount of feedback information from the receivers. The feedback information consists of the maximum achievable rate for each user ..."
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User Random Beamforming (SUBF) scheme. The proposed scheme maximizes the average sum rate under a TDMA environment (i.e., supporting a single user at a time) with the partial channel state information (CSI) feedback constraint. I.

Adaptive Orthonormal Random Beamforming for Cellular Downlink with Multiple Antennas

by Kai Zhang, Zhisheng Niu
"... Abstract——Channel state information (CSI) at transmitter plays an important role for multiuser MIMO broadcast channels, but full CSI at transmitter is not available for many practical systems. Previous work has proposed an orthonormal random beamforming (ORBF) [16] for MIMO broadcast channels with p ..."
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Abstract——Channel state information (CSI) at transmitter plays an important role for multiuser MIMO broadcast channels, but full CSI at transmitter is not available for many practical systems. Previous work has proposed an orthonormal random beamforming (ORBF) [16] for MIMO broadcast channels

1Random Beamforming with Multi-beam Selection for MIMO Broadcast Channels

by Kai Zhang, Zhisheng Niu
"... Abstract— — Previous work has shown that the capacity region of the Gaussian MIMO broadcast channels is achieved by dirty paper coding (DPC). However, due to high computation complex-ity of DPC and infeasibility of perfect channel state information (CSI) at the transmitter in many applications, this ..."
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, this paper focuses on a reduced complexity transmission scheme named orthonor-mal random beamforming (ORBF) [16], which only requires par-tial CSI feedback at the transmitter. Different from the previous work, we analyze the performance of ORBF with moderate num-ber of users and total transmit power
Results 1 - 10 of 307