On beamforming with finite rate feedback in multiple-antenna systems

Mukkavilli, K.K.; Sabharwal, Ashutosh; Erkip, Elza; Aazhang, Behnaam

doi:10.1109/tit.2003.817433

Cited by 799 publications

(515 citation statements)

References 17 publications

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“…Although in the single cluster network we are only quantizing a scalar channel space, its performance studies allow us to obtain some fundamental but important insights into the results for quantizing the multidimensional vector channel space. The outage performance using equal power allocation (EPA), allocating all CHs with the same powers, and optimal power allocation scheme for full CSI using (6) are also shown in the figure to provide performance benchmarks. Figure 8 shows a progression of performance improvement from EPA which has no knowledge of CSIT, to partial CSIT with increase in feedback resolution from 1 bit to 6 bits, to full CSI (complete knowledge of CSIT).…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Channel state information at transmitter (CSIT) relies on perfect channel state feedback from FC to the transmitters, which can be expensive or infeasible to implement in practice. Many works in the literature have looked at power control in the field of multiple input multiple output (MIMO) beamforming systems with partial CSIT using limited feedback [5,6]. The optimal power allocation scheme for systems employing limited feedback is in general complex and hence difficult to obtain.…”

Section: Introductionmentioning

confidence: 99%

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Distortion outage minimization in Nakagami fading using limited feedback

Wang

Dey

2011

EURASIP J. Adv. Signal Process.

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We focus on a decentralized estimation problem via a clustered wireless sensor network measuring a random Gaussian source where the clusterheads amplify and forward their received signals (from the intra-cluster sensors) over orthogonal independent stationary Nakagami fading channels to a remote fusion center that reconstructs an estimate of the original source. The objective of this paper is to design clusterhead transmit power allocation policies to minimize the distortion outage probability at the fusion center, subject to an expected sum transmit power constraint. In the case when full channel state information (CSI) is available at the clusterhead transmitters, the optimization problem can be shown to be convex and is solved exactly. When only rate-limited channel feedback is available, we design a number of computationally efficient sub-optimal power allocation algorithms to solve the associated non-convex optimization problem. We also derive an approximation for the diversity order of the distortion outage probability in the limit when the average transmission power goes to infinity. Numerical results illustrate that the sub-optimal power allocation algorithms perform very well and can close the outage probability gap between the constant power allocation (no CSI) and full CSI-based optimal power allocation with only 3-4 bits of channel feedback.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Distortion outage minimization in Nakagami fading using limited feedback

Wang

Dey

2011

EURASIP J. Adv. Signal Process.

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“…Note that with these deliberately separate notations of F k and W i , we intend to point out that the precoder selection done by the UE is only a recommendation towards eNB. For single stream single-user transmission, the optimal choice for a precoding vector f k for user k is known to be [19,20] …”

Section: Single-cell Operation In Lte/lte-advanced Systemmentioning

confidence: 99%

System-level performance of LTE-Advanced with joint transmission and dynamic point selection schemes

Määttänen¹,

Hamalainen²,

Venäläinen

et al. 2012

EURASIP J. Adv. Signal Process.

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In this article, we present a practical coordinated multipoint (CoMP) system for LTE-Advanced. In this CoMP system, cooperation is enabled for cell-edge users via dynamic switching between the normal single-cell operation and CoMP. We first formulate a general CoMP system model of several CoMP schemes. We then investigate a practical finite-rate feedback design that simultaneously supports interference coordination, joint transmission (JT), and dynamic point selection (DPS) with a varying number of cooperating transmission points while operating a single-cell transmission as a fallback mode. We provide both link-level and system-level results for the evaluation of different feedback options for general CoMP operation. The results show that there are substantial performance gains in cell-edge throughputs for both JT and DPS CoMP over the baseline Release 10 LTE-Advanced with practical feedback options. We also show that CoMP can enable improved mobility management in real networks.

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“…According to Mukkavilli et al [24], the number of clusters which satisfy criterion for each user is calculated approximately as N t N t −1 th . Therefore, the choice of is critical since it is directly relative to the total number of clusters per user.…”

Section: P2: the Combined Criterionmentioning

confidence: 99%

Feedback channel designs for fair scheduling in MISO–OFDMA systems

Özbek

Ruyet

2012

J Wireless Com Network

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In the next generation of wireless communication, adaptive resource allocation techniques will play an important role to improve quality of service and spectral efficiency. In order to employ adaptive fairness scheduling for multiple-input single-output (MISO) orthogonal frequency-division multiple access (OFDMA), the channel state information (CSI) belonging to all users is required at the base station. However, the amount of feedback increases with the number of users, transmit antennas and subchannels. Therefore, it is important to perform a user selection at the receiver side without cooperation among the users and to quantize the CSI. In this article, the reduced feedback channel designs are examined for MISO-OFDMA systems while providing fairness between the users. In order to reduce the feedback rate, we choose the users considering their norm and orthogonality properties as well as their location in the cell. In order to limit the feedback rate, channel direction information is quantized by designing a specific codebook thanks to the proposed criterion. We obtain an expression to determine the amount of required feedback information for MISO-OFDMA systems to support more than one beam per subchannel for a given number of users, subchannels and transmit antennas. The performance results of the reduced feedback channel designs are evaluated for fair scheduling in wireless channels.

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On beamforming with finite rate feedback in multiple-antenna systems

Cited by 799 publications

References 17 publications

Distortion outage minimization in Nakagami fading using limited feedback

Distortion outage minimization in Nakagami fading using limited feedback

System-level performance of LTE-Advanced with joint transmission and dynamic point selection schemes

Feedback channel designs for fair scheduling in MISO–OFDMA systems

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