Linear precoding for space-time coded systems with known fading correlations

Sampath, H.; Paulraj, A.

doi:10.1109/acssc.2001.986914

Cited by 79 publications

(151 citation statements)

References 10 publications

Supporting

Mentioning

148

Contrasting

Order By: Relevance

“…the optimal beam directions are directly given by UT = U R , whereas the optimal power allocation is obtained from a standard water-filling technique [13] …”

Section: Design Of the Space Encoder Wtmentioning

confidence: 99%

Optimal precoding for a novel RF-MIMO scheme in transmit correlated Rayleigh channels

Vía

Elvira

Ibáñez

et al. 2009

2009 IEEE 10th Workshop on Signal Processing Advances in Wireless Communications

View full text Add to dashboard Cite

Recently, a novel MIMO transceiver architecture, which avoids the costly conversion to/from baseband through parallel RF chains, has been proposed. Despite its obvious advantages, the limitations of the analog combining architecture makes necessary to develop specific transmission schemes. For instance, in the case of perfect channel state information (CSI) at the receiver, and correlation CSI at the transmitter, the space and time encoders must operate separately (the former works in the RF domain and the latter works in baseband), and at different time scales: the spatial encoder or RF beamformer must remain fixed during the transmission of a probably large number of symbols, whereas the time encoder can work at the symbol rate. In this paper we propose a transmission scheme for this scenario with the goal of minimizing the pairwise error probability (PEP). In particular, with the proposed scheme the symbols are time-precoded with a unitary discrete Fourier transform (DFT) matrix, and then are successively transmitted using a set of RF weights (beamformers). The optimal spatial precoding matrix containing the RF beamformers is obtained by matching its left eigenspace with the eigenspace of the channel correlation matrix, applying standard power water-filling along these directions, and choosing its right eigenspace as any unitary matrix with unit-norm elements such as the DFT matrix. Numerical examples illustrate the good performance of the proposed scheme.

show abstract

“…the optimal beam directions are directly given by UT = U R , whereas the optimal power allocation is obtained from a standard water-filling technique [13] …”

Section: Design Of the Space Encoder Wtmentioning

confidence: 99%

Optimal precoding for a novel RF-MIMO scheme in transmit correlated Rayleigh channels

Vía

Elvira

Ibáñez

et al. 2009

2009 IEEE 10th Workshop on Signal Processing Advances in Wireless Communications

View full text Add to dashboard Cite

show abstract

“…Recent works in multiple-input multiple-output (MIMO) wireless channel capacity and coding have shown that channel knowledge at the transmitter, in either full or partial forms, can increase the channel capacity and performance considerably [5][6][7][8][9][10][11][12][13]. While zero-mean channels have largely been the focus of the existing work, it is also often found in practice that the wireless channel has a non-zero mean [2,3].…”

Section: Introductionmentioning

confidence: 99%

Optimum space‐time transmission for a high K factor wireless channel with partial channel knowledge

Paulraj

2004

Wireless Communications

View full text Add to dashboard Cite

SummaryWe study the optimum transmission scheme that maximizes ergodic capacity of a 2 Â 1 multiple-input single-output (MISO) system, when the channel knowledge at the transmitter is characterized by a known gain ratio and a known probability density function (PDF) of the phase shift between antennas. Such a channel scenario can arise in a forward link at the base station when there is a single direct path propagation. We show that the optimum transmit solution is beamforming on the mean value of the phase shift with unequal power input to the antennas. When the phase is completely unknown, the solution reduces to a single antenna transmission.

show abstract

“…To that end, the design of optimum training sequences for estimation of uncorrelated and correlated MIMO channels are studied in [4], [6]. Also considered in detail, in references [7]- [9], are optimal transmission strategies with imperfect CSI at the transmitter side. We must note that all of these approaches optimize the transmission strategy for a given channel estimation process, and assume perfect CSI at the receiver side.…”

Section: Introductionmentioning

confidence: 99%

Transmission strategies for correlated MIMO links with imperfect channel estimates

Serbetli

Yener

2005

IEEE International Conference on Communications, 2005. ICC 2005. 2005

View full text Add to dashboard Cite

Abstract-We investigate the transmit precoder design problem for a multiple input multiple output (MIMO) link with correlated receive antennas, considering the effect of channel estimation. We propose transceiver structures that are optimum in the sense of minimizing the total MSE and distributing the total MSE equally among the parallel data streams. We also investigate the problem of how the correlated MIMO link should distribute its total available power between power expended for channel estimation versus data transmission. The optimum power allocation problem between the training sequences for channel estimation and data transmission for the correlated MIMO link is shown to have a unique solution, that is different than the uncorrelated case. The performance of the system is observed to be more sensitive to transceiver design rather than the power allocation. The results demonstrate that the correlation structure of the MIMO link has a profound effect on the performance, and that the transceiver optimization should be done by taking both the correlation and the channel estimation process into account.

show abstract

Linear precoding for space-time coded systems with known fading correlations

Cited by 79 publications

References 10 publications

Optimal precoding for a novel RF-MIMO scheme in transmit correlated Rayleigh channels

Optimal precoding for a novel RF-MIMO scheme in transmit correlated Rayleigh channels

Optimum space‐time transmission for a high K factor wireless channel with partial channel knowledge

Transmission strategies for correlated MIMO links with imperfect channel estimates

Contact Info

Product

Resources

About