Closed loop transmission with precoding selection in LTE/LTE-Advanced system

Bai, Zijian; Spiegel, Christoph; Bruck, Guido H.; Jung, Peter; Horvat, Michael; Berkmann, Jens; Drewes, Christian; Gunzelmann, Bertram

doi:10.1109/isabel.2010.5702840

Cited by 21 publications

(13 citation statements)

References 3 publications

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“…The summation over K sub-carriers indicates that the same precoding is applied to K sub-carriers, where K may range from 12 to 1200. The criterion used in (2) for determining the precoding matrix Wopt is referred to as the minimum MMSE trace criterion [11]. To report the index of Wopt in F is called the report of PMI.…”

Section: Report Of Precoder Matrix Indicator For the Downlink Transmimentioning

confidence: 99%

“…Practical criteria for determining RI and PMI in LTE include [11][12][13][14][15] minimum mean square error (MMSE) geometric mean, MMSE trace, maximum post processing SNR, post MMSE, maximum channel capacity, and maximum mutual information. Note that most of these criteria are related to the MMSE detector and rely on the computation of the error covariance matrix.…”

Section: Introductionmentioning

confidence: 99%

“…The computation tricks applied to one selection criterion can therefore be applied to another selection criterion. Among these selection criteria, the MMSE trace criterion leads to the best bit error rate (BER) performance and complexity trade-off [11,13]. Additionally, for the downlink of the LTE transmission, the report of both RI and PMI is requested aperiodically; the receiver needs to yield the report in 4 ms [7].…”

Section: Introductionmentioning

confidence: 99%

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Implementation of the precoder matrix indicator selection using MMSE trace criterion for the downlink transmission in LTE

Chung

Liu

Chu

2016

2016 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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Based on the minimum mean squared error (MMSE) trace criterion, selection of the precoding matrix indicator (PMI) from the downlink codebook of the LTE system is considered in this paper. Due to the codebook of 16 member precoding matrices and up to 1200 sub-carriers in this MIMO-OFDM system, the PMI selection needs to compute matrix inversion of up to 19,200 matrices. To satisfy this required workload, LDL H decomposition is applied at the algorithmic level, and, pipeline matrix multiplication and backward substitution modules are used at the architectural level. The VLSI implementation results of our architecture under the TSMC 90 nm CMOS technology reveals that our architecture requires 124.6K gates at operating frequency 120 MHz. Thus, our designed architecture can finish the 19,200 matrix inversions in about 1.60 ms and meets the requirement of 2 ms period of periodic channel state report.

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Section: Report Of Precoder Matrix Indicator For the Downlink Transmimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Implementation of the precoder matrix indicator selection using MMSE trace criterion for the downlink transmission in LTE

Chung

Liu

Chu

2016

2016 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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“…The reported PMIs from the UE are intended to guide the TP to inquire DL-CSI and align the transmitted signals to the target UE. The study in [6] presents different PMI selection criteria. For single layer transmission the maximum post-SNR (MaxSNR) is shwon to be the adequate one.…”

Section: A Pmi Selection In Single Point Scenariomentioning

confidence: 99%

Evaluation of Implicit Feedback in Coordinated Multipoint Transmission beyond LTE-Advanced

Bai

Iwelski

Bruck

et al. 2013

2013 IEEE 77th Vehicular Technology Conference (VTC Spring)

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Coordinated Multipoint (CoMP) was adapted as a key technique to improve the coverage of high data rates and the cell-edge user experience in beyond LTE-Advanced systems. CoMP simultaneously supports multiple Transmission Points (TPs) to serve mobile devices in the high interference areas, which occur between cells. In theory it can provide significant gains in the order of high double-digit percentages for cell-edge user throughput while increasing overall network efficiency. The aim of this paper is to get an insight of the system performance and configuration flexibility of CoMP transmission in beyond LTEAdvanced systems. Different channel state information feedback concepts for CoMP networks have been analyzed theoretically and verified through Monte Carlo simulations. Complexity and implementation issues have been addressed as well. The results have shown that downlink CoMP schemes are very effective in improving the overall system performance. Furthermore, the investigation has shown that different feedback approaches bring different performance gains but also different complexity and implementation challenges. Finally, the most effective feedback approach and system configuration for CoMP scenarios investigated in this study is suggested.

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“…Finally, in [2] the authors give a brief overview of the LTE and LTE-advanced system downlink transmission and discuss different precoding matrix selection criteria. Following the analytical and numerical results, the authors conclude that the "minimum post-mean squared error" based criterion is a good candidate for precoding matrix selection at the receivers.…”

Section: Related Workmentioning

confidence: 99%

Efficient allocation of CQI channels in broadband wireless networks

Cohen

Grebla

2011

2011 Proceedings IEEE INFOCOM

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Abstract-Advanced wireless technologies such as MIMO require each mobile station (MS) to send a lot of feedback to the base station. This periodic feedback consumes much of the uplink bandwidth. This expensive bandwidth is very often viewed as a major obstacle to the deployment of MIMO and other advanced closed-loop wireless technologies. This paper is the first to propose a framework for efficient allocation of periodic feedback channels to the nodes of a wireless network. Several relevant optimization problems are defined and efficient algorithms for solving them are presented. A scheme for deciding when the BS should invoke each algorithm is also proposed and shown through simulations to perform very well.

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Closed loop transmission with precoding selection in LTE/LTE-Advanced system

Cited by 21 publications

References 3 publications

Implementation of the precoder matrix indicator selection using MMSE trace criterion for the downlink transmission in LTE

Implementation of the precoder matrix indicator selection using MMSE trace criterion for the downlink transmission in LTE

Evaluation of Implicit Feedback in Coordinated Multipoint Transmission beyond LTE-Advanced

Efficient allocation of CQI channels in broadband wireless networks

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