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Results 1 - 10
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1,016
Joint beamforming and scheduling for a multiantenna downlink with imperfect transmitter channel knowledge
- IEEE J. Select. Areas Commun
, 2007
"... We consider the downlink of a wireless system where the base-station has M ≥ 1 antennas and K user terminals have one antenna each. We study the weighted rate sum maximization in the case of non-perfect Channel State Information at the Transmitter (CSIT). Some relevant downlink optimization problems ..."
Abstract
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Cited by 22 (4 self)
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We consider the downlink of a wireless system where the base-station has M ≥ 1 antennas and K user terminals have one antenna each. We study the weighted rate sum maximization in the case of non-perfect Channel State Information at the Transmitter (CSIT). Some relevant downlink optimization
Cooperative strategies and capacity theorems for relay networks
- IEEE TRANS. INFORM. THEORY
, 2005
"... Coding strategies that exploit node cooperation are developed for relay networks. Two basic schemes are studied: the relays decode-and-forward the source message to the destination, or they compress-and-forward their channel outputs to the destination. The decode-and-forward scheme is a variant of ..."
Abstract
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Cited by 739 (19 self)
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channel knowl-edge is available at the transmitters, and cases where local user co-operation is permitted. The results further extend to multisource and multidestination networks such as multiaccess and broadcast relay channels.
The effect upon channel capacity in wireless communications of perfect and imperfect knowledge of the channel
- IEEE Trans. Inf. Theory
, 2000
"... Abstract—We present a model for time-varying communication single-access and multiple-access channels without feedback. We consider the difference between mutual information when the receiver knows the channel perfectly and mutual information when the receiver only has an estimate of the channel. We ..."
Abstract
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Cited by 271 (7 self)
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of the channel to the loss in mutual information due to imperfect knowledge of the measured channel. Index Terms—Channel uncertainty, multiple-access channels, mutual information, time-varying channels, wireless communications. I.
Space–time transmit precoding with imperfect channel feedback
- IEEE Trans. Inform. Theory
, 2001
"... Abstract—The use of channel feedback from receiver to transmitter is standard in wireline communications. While knowledge of the channel at the transmitter would produce similar benefits for wireless communications as well, the generation of reliable channel feedback is complicated by the rapid time ..."
Abstract
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Cited by 201 (7 self)
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Abstract—The use of channel feedback from receiver to transmitter is standard in wireline communications. While knowledge of the channel at the transmitter would produce similar benefits for wireless communications as well, the generation of reliable channel feedback is complicated by the rapid
IMPERFECT CHANNEL KNOWLEDGE
, 2007
"... The capacity of single and multi-user state-dependent channels under imperfect channel knowledge at the receiver(s) and/or transmitter are investigated. We address these channel mismatch scenarios by introducing two novel notions of reliable commu-nication under channel estimation errors, for which ..."
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The capacity of single and multi-user state-dependent channels under imperfect channel knowledge at the receiver(s) and/or transmitter are investigated. We address these channel mismatch scenarios by introducing two novel notions of reliable commu-nication under channel estimation errors, for which
Grassmannian beamforming for multiple-input multiple-output wireless systems
- IEEE TRANS. INFORM. THEORY
, 2003
"... Transmit beamforming and receive combining are simple methods for exploiting the significant diversity that is available in multiple-input and multiple-output (MIMO) wireless systems. Unfortunately, optimal performance requires either complete channel knowledge or knowledge of the optimal beamformi ..."
Abstract
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Cited by 329 (38 self)
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Transmit beamforming and receive combining are simple methods for exploiting the significant diversity that is available in multiple-input and multiple-output (MIMO) wireless systems. Unfortunately, optimal performance requires either complete channel knowledge or knowledge of the optimal
Achievable Rates in Cognitive Radio Channels
- IEEE Trans. Inf. Theory
, 2006
"... Cognitive radio promises a low cost, highly flexible alternative to the classic single frequency band, single protocol wireless device. By sensing and adapting to its environment, such a device is able to fill voids in the wireless spectrum and dramatically increase spectral efficiency. In this pape ..."
Abstract
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Cited by 274 (46 self)
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. In this paper, the cognitive radio channel is defined as an n-transmitter, m-receiver interference channel in which sender i obtains the messages senders 1 through i − 1 plan to transmit. The two sender, two receiver case is considered. In this scenario, one user, a cognitive radio, obtains (genie assisted
Transmitter Optimization and Optimality of Beamforming for Multiple Antenna Systems with Imperfect Feedback
"... We solve the transmitter optimization problem and determine a necessary and sucient condition under which beamforming achieves Shannon capacity in a narrowband point to point communication system employing multiple transmit and receive antennas. We assume perfect channel state information at the rec ..."
Abstract
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Cited by 128 (7 self)
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at the receiver (CSIR) and imperfect channel state feedback from the receiver to the transmitter. We consider the cases of mean and covariance feedback. The channel is modeled at the transmitter as a matrix of complex jointly Gaussian random variables with either a zero mean and a known covariance matrix
Channels with Imperfect Transmitter Side-Information
"... A fading broadcast channel is considered where the transmitter employs two antennas and each of the two receivers employs a single receive antenna. It is demonstrated that even if the realization of the fading is precisely known to the receivers, the high signal-to-noise (SNR) throughput is greatly ..."
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A fading broadcast channel is considered where the transmitter employs two antennas and each of the two receivers employs a single receive antenna. It is demonstrated that even if the realization of the fading is precisely known to the receivers, the high signal-to-noise (SNR) throughput is greatly
Dirty-paper Coding without Channel Information at the Transmitter and Imperfect Estimation at the Receiver
"... Abstract—In this paper, we examine the effects of imperfect channel estimation at the receiver and no channel knowledge at the transmitter on the capacity of the fading Costa’s channel with channel state information non-causally known at the transmitter. We derive the optimal Dirty-paper coding (DPC ..."
Abstract
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Cited by 1 (0 self)
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Abstract—In this paper, we examine the effects of imperfect channel estimation at the receiver and no channel knowledge at the transmitter on the capacity of the fading Costa’s channel with channel state information non-causally known at the transmitter. We derive the optimal Dirty-paper coding
Results 1 - 10
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1,016
