Relay Precoder Optimization in MIMO-Relay Networks With Imperfect CSI

Ubaidulla, P.; Chockalingam, A.

doi:10.1109/tsp.2011.2164401

Cited by 83 publications

(54 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Therefore, any finite rate is feasible for P RS (R t ), which is always guaranteed by the cutting-set method. This can also be explained by noting the QoS multicast problem [48], which is always feasible, is in fact a subproblem of (33). Fig.…”

Section: Qos Constrained Power Minimizationmentioning

confidence: 97%

“…While modifying Algorithm 1 and Algorithm 2 to address (33) and (34) is straightforward, it should be noted that an arbitrary initialization of P may easily yield an infeasible point which fails to satisfy the rate constraints. In this case, the AO algorithm fails to produce a feasible solution, making the initialization a very crucial step.…”

Section: Qos Constrained Power Minimizationmentioning

confidence: 99%

“…Contrary to works adopting this method [10], [33]- [35], we avoid conservative approximations used to convexify the optimization step, and we solve the pessimization step exactly, and hence guarantee convergence to a robust solution of the original semi-infinite problem. We further prove the KKT optimality of the solution.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Robust Transmission in Downlink Multiuser MISO Systems: A Rate-Splitting Approach

Joudeh

Clerckx

2016

IEEE Trans. Signal Process.

206

171

View full text Add to dashboard Cite

Abstract-We consider a downlink multiuser MISO system with bounded errors in the Channel State Information at the Transmitter (CSIT). We first look at the robust design problem of achieving max-min fairness amongst users (in the worstcase sense). Contrary to the conventional approach adopted in literature, we propose a rather unorthodox design based on a Rate-Splitting (RS) strategy. Each user's message is split into two parts, a common part and a private part. All common parts are packed into one super common message encoded using a public codebook, while private parts are independently encoded. The resulting symbol streams are linearly precoded and simultaneously transmitted, and each receiver retrieves its intended message by decoding both the common stream and its corresponding private stream. For CSIT uncertainty regions that scale with SNR (e.g. by scaling the number of feedback bits), we prove that a RS-based design achieves higher max-min (symmetric) Degrees of Freedom (DoF) compared to conventional designs (NoRS). For the special case of non-scaling CSIT (e.g. fixed number of feedback bits), and contrary to NoRS, RS can achieve a non-saturating max-min rate. We propose a robust algorithm based on the cutting-set method coupled with the Weighted Minimum Mean Square Error (WMMSE) approach, and we demonstrate its performance gains over state-of-the art designs. Finally, we extend the RS strategy to address the Quality of Service (QoS) constrained power minimization problem, and we demonstrate significant gains over NoRS-based designs.Index Terms-MISO-BC, degrees of freedom, linear precoding, max-min fairness, quality-of-service, robust optimization.

show abstract

Section: Qos Constrained Power Minimizationmentioning

confidence: 97%

Section: Qos Constrained Power Minimizationmentioning

confidence: 99%

See 1 more Smart Citation

Robust Transmission in Downlink Multiuser MISO Systems: A Rate-Splitting Approach

Joudeh

Clerckx

2016

IEEE Trans. Signal Process.

206

171

View full text Add to dashboard Cite

show abstract

“…A statistically robust design has been presented for linear AF MIMO relays for two imperfect CSI scenarios in [37], whereas this approach has been extended for the same network with a direct link in [38]. In [39], a robust joint relay precoder and destination receive filters design has been considered for an AF relay network with two models of CSI error, namely, stochastic and norm-bounded errors.…”

Section: A Related Work: Mse Based Robust Designsmentioning

confidence: 99%

Robust MMSE Beamforming for Multiantenna Relay Networks

Cumanan

Ding

Rahulamathavan

et al. 2016

IEEE Trans. Veh. Technol.

View full text Add to dashboard Cite

“…e transmitter cannot directly access its own CSI, thus CSITcan only be acquired indirectly. In practice, the quality of CSI obtained is often imperfect and degraded due to quantization errors, feedback delay, and channel estimation errors [6,7]. e imperfect CSI (ICSI) causes performance degradation and since these errors are inevitable, it is necessary to formulate robust designs to combat their effects [3].…”

Section: Introductionmentioning

confidence: 99%

Transceiver Designs for MIMO Relaying Systems with Imperfect Channel State Information

Antwi-Boasiako

Song

Lee

2018

Mobile Information Systems

View full text Add to dashboard Cite

We focus on imperfect channel state information (ICSI) in closed-loop multiple-input multiple-output (MIMO) amplify-andforward (AF) relaying systems. First, near-optimal closed-form solutions for transceiver designs are provided for the source-torelay-to-destination link with ICSI at all nodes. Next, considering a nonnegligible direct link with ICSI available only at the relay and destination and no CSI or ICSI at the source, near-optimal designs are proposed. e Wiener or minimum mean square error (MMSE) filter is employed at the destination to estimate the transmitted signal. e effect of CSI mismatch on the performance of the proposed scheme is then shown through simulations.

show abstract

Relay Precoder Optimization in MIMO-Relay Networks With Imperfect CSI

Cited by 83 publications

References 22 publications

Robust Transmission in Downlink Multiuser MISO Systems: A Rate-Splitting Approach

Robust Transmission in Downlink Multiuser MISO Systems: A Rate-Splitting Approach

Robust MMSE Beamforming for Multiantenna Relay Networks

Transceiver Designs for MIMO Relaying Systems with Imperfect Channel State Information

Contact Info

Product

Resources

About