Statistical Eigenmode-Based SDMA for Two-User Downlink

Wang, Jue; Jin, Shi; Gao, Xiqi; Wong, Kai-Kit; Au, Edward

doi:10.1109/tsp.2012.2204988

Cited by 82 publications

(50 citation statements)

References 35 publications

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“…1 Regarding related literature, a SCSIaided MU-MIMO downlink transmission scheme was initially studied in [22,23], where the impact of spatial correlation on the achievable sum-rate and feedback overhead was investigated. Furthermore, the authors in [24] demonstrated that SE-SDMA can achieve the maximum achievable ergodic sum-rate for MU-MIMO with SCSI at the BS and perfect CSI at the users. Moreover, the authors in [25] addressed the optimal statistical precoder design for a simple multiuser case and derived a closed-form expression for the ergodic sum-rate, under the assumption that the BS has only two antennas and each of the two users has one antenna.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the authors in [25] addressed the optimal statistical precoder design for a simple multiuser case and derived a closed-form expression for the ergodic sum-rate, under the assumption that the BS has only two antennas and each of the two users has one antenna. However, the analytical results of [24,25] were limited to two-user correlated and semi-correlated Rayleigh fading channels, respectively, while the practical case of MU-MIMO in Rician fading channels, with an arbitrary number of BS antennas and users, remains still an open research problem.…”

Section: Introductionmentioning

confidence: 99%

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Statistical Eigenmode Transmission for the MU-MIMO Downlink in Rician Fading

Jin

Tan

Matthaiou

et al. 2015

IEEE Trans. Wireless Commun.

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Abstract-In this paper, we study the achievable ergodic sum-rate of multiuser multiple-input multiple-output downlink systems in Rician fading channels. We first derive a lower bound on the average signal-to-leakage-and-noise ratio by using the Mullen's inequality, and then use it to analyze the effect of channel mean information on the achievable ergodic sum-rate. A novel statistical-eigenmode space-division multiple-access (SE-SDMA) downlink transmission scheme is then proposed. For this scheme, we derive an exact analytical closed-form expression for the achievable ergodic rate and present tractable tight upper and lower bounds. Based on our analysis, we gain valuable insights into the system parameters, such as the number of transmit antennas, the signal-to-noise ratio (SNR) and Rician K-factor on the system sum-rate. Results show that the sum-rate converges to a saturation value in the high SNR regime and tends to a lower limit for the low Rician K-factor case. In addition, we compare the achievable ergodic sum-rate between SE-SDMA and zeroforcing beamforming with perfect channel state information at the base station. Our results reveal that the rate gap tends to zero in the high Rician K-factor regime. Finally, numerical results are presented to validate our analysis.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Statistical Eigenmode Transmission for the MU-MIMO Downlink in Rician Fading

Jin

Tan

Matthaiou

et al. 2015

IEEE Trans. Wireless Commun.

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“…Fortunately, partial CSIs can be more accurately obtained through long term channel feedback. Precoding based on the statistical CSIs has been well studied for single-user multiple input multiple output (SU-MIMO) [68], [69] and then extended to multiuser MIMO (MU-MIMO) [70], [71]. A scheme firstly proposed in [72] considers a transmission scheme that is proved to achieve a larger degree of freedom than one with completely outdated CSIs.…”

Section: B Precoding With Imperfect Csis 1) Precoding With Statisticmentioning

confidence: 99%

Recent Advances in Cloud Radio Access Networks: System Architectures, Key Techniques, and Open Issues

Peng

Sun

et al. 2016

IEEE Commun. Surv. Tutorials

355

205

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Abstract-As a promising paradigm to reduce both capital and operating expenditures, the cloud radio access network (C-RAN) has been shown to provide high spectral efficiency and energy efficiency. Motivated by its significant theoretical performance gains and potential advantages, C-RANs have been advocated by both the industry and research community. This paper comprehensively surveys the recent advances of C-RANs, including system architectures, key techniques, and open issues. The system architectures with different functional splits and the corresponding characteristics are comprehensively summarized and discussed. The state-of-the-art key techniques in C-RANs are classified as: the fronthaul compression, large-scale collaborative processing, and channel estimation in the physical layer; and the radio resource allocation and optimization in the upper layer. Additionally, given the extensiveness of the research area, open issues and challenges are presented to spur future investigations, in which the involvement of edge cache, big data mining, socialaware device-to-device, cognitive radio, software defined network, and physical layer security for C-RANs are discussed, and the progress of testbed development and trial test are introduced as well.

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“…In practice, a codebook-based user grouping algorithm can be used to select users in such a way. A detailed description of such an algorithm is beyond the scope of this paper, and interested readers are referred to [15]. With user selection, the ergodic SNR ratio between SE-MAT and MAT is enhanced.…”

Section: B Se-mat With User Selectionmentioning

confidence: 99%

“…In point-to-point MIMO systems, SCSI-aided transmission schemes have been well studied in the literature, e.g., see [10]- [13] and the references therein. The use of SCSI is also extended to the multiuser scenario in [14], [15]. Inspired by these outdated CSI or SCSI-aided transmission schemes, we make a conjecture that on the basis of the outdated CSI-aided MAT scheme, SCSI can be exploited to further improve the system performance.…”

Section: Introductionmentioning

confidence: 99%

Exploiting statistical and outdated CSI in multiuser downlink transmission

Jin

Wang

Matthaiou

et al. 2012

2012 International Conference on Wireless Communications and Signal Processing (WCSP)

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Abstract-In this paper, we propose a multiuser downlink transmission scheme, which exploits both the statistical and outdated channel state information (CSI) at the transmitter. The proposed scheme extends the outdated CSI-aided scheme, first introduced by Maddah-Ali and Tse in [1] (denoted as MAT), by sending symbols demanded by a user along its statistical eigenmodes, instead of directly sending the symbols through separate antennas, and we refer to it as statistical eigenmode-MAT (SE-MAT). Considering zero-forcing receiver, we explicitly prove that the proposed SE-MAT scheme can achieve a higher ergodic sum-rate compared to the original MAT scheme, under different correlation conditions. Moreover, a user selection method which selects statistically orthogonal users for the SE-MAT transmission is proposed to further improve the system performance.

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Statistical Eigenmode-Based SDMA for Two-User Downlink

Cited by 82 publications

References 35 publications

Statistical Eigenmode Transmission for the MU-MIMO Downlink in Rician Fading

Statistical Eigenmode Transmission for the MU-MIMO Downlink in Rician Fading

Recent Advances in Cloud Radio Access Networks: System Architectures, Key Techniques, and Open Issues

Exploiting statistical and outdated CSI in multiuser downlink transmission

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