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检索条件"主题词=prediction coding"

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A Novel Link Adaptive Transmission Scheme in Higher-Order MIMO Systems

A Novel Link Adaptive Transmission Scheme in Higher-Order MI...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Minxia Hu Shi Jin Xiqi Gao National Mobile Communications Research Laboratory Southeast University Nanjing 210096 China

ISBN: (纸本)9781457713460

This paper proposes a novel cascaded precoding scheme at the base station to adapt to both long-term and short-term channel variations in higher-order MIMO systems which are supported in 3GPP LTE-Advanced. The proposed precoding scheme includes a long-term precoding followed by a short-term precoding, where the former bases on the channel statistical eigenmodes, adapting to the long-term channel variations and the latter bases on the LTE Rel. 8 codebook, adapting to the short-term channel variations. Simulation results show that the proposed scheme can achieve a high spectral efficiency while guaranteeing a given codeword error ratio target. And when compared with the precoding scheme using the codebook for LTE-Advanced which is finally fixed recently in one of the 3GPP's proposals, the proposed scheme has a comparable performance but a reduced complexity due to the codebook size and long-term feedback interval.

关键词： prediction coding codebook multiple input multiple output systems Local thermodynamic equilibrium spectral efficiency BASE STATION Adaptive transmission Scheme higher-order

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Optimizing Energy for Training vs. Data in Linearly Precoded Multiuser Sum-Rate Maximization

Optimizing Energy for Training vs. Data in Linearly Precoded...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Adam J. Tenenbaum Raviraj S. Adve Dept. of Electrical and Computer Engineering University of Toronto

ISBN: (纸本)9781457713460

We consider the problem of optimizing the allocation of available energy across training and data symbols under linear precoding in multiuser downlink systems with imperfect channel state information (CSI). Our figure of merit is the sum rate across all users. This paper derives a lower bound on achievable rate under linear precoding and extends existing precoder designs to the case of imperfect CSI. Optimality and separability results for the energy allocation and precoder design problems that were found previously for sum-MSE minimization are extended to the problem of sum-rate maximization when channels are modelled using uncorrelated Rayleigh block fading with equal variances of the fading coefficients. Simulation results suggest significant improvements in achievable rate under the proposed algorithm.

关键词： Functional training available energy prediction coding Training Quality factor Imperfect fading color realizable

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Optimal Precoding for Multi-Way Relay Channels with QAM Constellations

Optimal Precoding for Multi-Way Relay Channels with QAM Cons...

引用

IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： Shaham Sharifian T. Aaron Gulliver Department of Electrical and Computer Engineering University of Victoria

ISBN: (纸本)9781479915002

Complex field network coding has been shown to achieve a throughput of 1/2 symbol per user per channel use in a multi-way relay channel (MWRC). To achieve this throughput, a superimposed combination of user symbols must be distinguishable at the relay. In [1], precoding vectors were designed for an MWRC with all users employing the same rectangular quadrature amplitude modulation (QAM) constellation. These precoding vectors guarantee that every superimposed combination of user symbols at the relay is distinguishable and a QAM constellation is received. There are many precoding vectors with such properties. In this paper, we consider a more general problem in which each user can employ an arbitrary rectangular QAM constellation and we design a precoding vector for the users such that the power efficiency of the received rectangular QAM constellation at the relay is maximized.

关键词： Multi-way relay channels Network coding Cooperative communications Network coding Quadrature amplitude modulation prediction coding CONSTELLATIONS relay cooperative communication Consumers relay channel dynamic efficiency

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Enhanced Iterative Max-Sum-Rate Algorithm for Linear MU-MIMO Precoding

Enhanced Iterative Max-Sum-Rate Algorithm for Linear MU-MIMO...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Chongning Na Xiaolin Hou Atsushi Harada DOCOMO Beijing Communications Laboratories Co. Ltd. 7/F Raycom Infotech Park Tower A No. 2 Kexueyuan South Road Haidian 100190 China

ISBN: (纸本)9781457713460

Multi-user multiple input multiple output (MU-MIMO) systems can achieve high spectral efficiency for wireless communication. The design of optimal transmit precoding for max-sum-rate (MSR) MU-MIMO downlink transmission is a non-trivial problem. Recent research approached this problem by exploiting the relationship between max-sum-rate and the minimum-mean-squared-error (MMSE) and proposed several iterative schemes. Based on these research results, we propose enhanced iterative MSR algorithms for linear MU-MIMO precoding which improve the sum rate performance and reduce the computational complexity. The effectiveness of the proposed method is verified by numerical simulations.

关键词： prediction coding multiple input multiple output systems Iterative spectral efficiency CARRIER SYSTEM downlinking

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Statistical Eigenmode SDMA Transmission for a Two-User Downlink

Statistical Eigenmode SDMA Transmission for a Two-User Downl...

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IEEE International Conference on Communications

作者： Jue Wang Shi Jin Xiqi Gao Kai-Kit Wong Edward Au National Mobile Communications Research Laboratory Southeast University Department of Electronic and Electrical Engineering University College London Huawei Technologies

ISBN: (纸本)9781457720529

This paper proposes a statistical-eigenmode space-division multiple-access (SE-SDMA) transmission for a two-user downlink system where two transmit antennas are equipped at the base station and each mobile user has one receive antenna, assuming that only statistical channel state information (CSI) is available at the transmitter. By maximizing a lower bound of the ergodic signal-to-leakage-and-noise ratio, the proposed SE-SDMA approach selects two users with orthogonal principal statistical eigen-directions and transmits to each user along the corresponding eigenmode. We derive an exact expression of the ergodic achievable rate, and compare it with the zero-forcing beamforming (ZFBF) system exploiting instantaneous CSI. It is shown that SE-SDMA can achieve the maximum ergodic sum-rate of the two selected users, and provide significant user selection gain. Analytical and simulation results show that the rate gap between SE-SDMA and ZFBF with perfect CSI at the transmitter can tend to zero in highly correlated channels, which indicates that statistical precoding can be used instead of instantaneous precoding in certain environments.

关键词： Transmitters Downlink Space division multiple access transmitting antennas prediction coding Consumers BASE STATION Transmitter

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Out of Group Interference Aware Precoding for CoMP: A Maximum Eigenmode Based Approach

Out of Group Interference Aware Precoding for CoMP: A Maximu...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Yiwei Fang John Thompson Fujitsu Laboratories of Europe Ltd Hayes Park Central Institute for Digital Communications School of Engineering University of Edinburgh

ISBN: (纸本)9781457713460

Past studies on Cooperative Multi-Point (CoMP) Processing/Base Station Cooperation (BSC) technique have shown its potential for system capacity improvement. However, many of the previous studies ignore a fact that in a network where multiple CoMP groups co-exist, the interference between CoMP groups would significantly decrease each of the CoMP groups' performance. To combat this Interference between CoMP groups, we propose a novel precoding technique - Maximum Eigenmode Transmission (MET) CoMP precoding, which is able to effectively combat such interference and achieves 90% better performance than the conventional method in a multi-group CoMP network.

关键词： interference prediction coding editing interference Fighter Awareness

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CLOSED LOOP TRANSMISSION FOR LTE SYSTEM DOWNLINK

CLOSED LOOP TRANSMISSION FOR LTE SYSTEM DOWNLINK

引用

European Wireless Conference

作者： Xiaojia Lu Jin Han Markku Juntti Centre for Wireless Communications

ISBN: (纸本)9781424459353

This paper studies the downlink closed loop transmission in the 3G long term evolution (LTE) system. We propose a precoding matrix selection algorithm from a finite codebook. The precoding, antenna selection, adaptive modulation and coding (AMC) require the channel information fed back from receiver to optimize the system performance. We study the codebook design and precoding matrix selection in LTE system, particularly the single user (SU) in a fading channel scenario. As a comparison to precoding, the antenna subset selection is investigated. The link adaption based on the instantaneous signal-to-noise ratio is also studied. The proposed rank and link adaption algorithm select the precoding matrix and AMC that maximize the spectral efficiency under a certain frame error rate constraint.

关键词： codebook design Long Term Evolution prediction coding cyclic transmission Local thermodynamic equilibrium signal to noise ratios AMCN gene antecedent moisture condition (amc) information channels System performance spectral efficiency

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Capacity Analysis of Zero-Forcing Precoding in Multibeam Satellite Systems with Rain Fading

Capacity Analysis of Zero-Forcing Precoding in Multibeam Sat...

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IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communications

作者： Ishtiaq Ahmad Khoa D. Nguyen Andre Pollok Nick Letzepis Institute for Telecommunications Research University of South Australia Defence Science and Technology Group (DSTG)

ISBN: (纸本)9781509032556

Multibeam satellite communication (SatCom) with full or aggressive frequency re-use is one of the most promising candidates for next-generation high throughput satellite systems. However, frequency re-use creates interbeam interference which needs to be managed using multiuser precoding techniques in the forward link and multiuser detection techniques in the reverse link. This work considers the forward link of multibeam Sat-Com systems and proposes a novel zero-forcing (ZF) precoding technique that makes use of users' physical location and antenna radiation pattern available at the gateway. Contrary to conventional precoding techniques in multibeam SatCom systems, the proposed precoding technique does not require feedback from user terminals. Numerical results show that the proposed ZF precoder achieves higher ergodic capacity than the conventional ZF precoder. We provide a closed-form approximation for the ergodic capacity of the proposed ZF precoder under rain fading. We also provide a closed-form approximation for computing the moments of the rain fading attenuation which enables us to derive high and low signal-to-noise ratio (SNR) expressions of the ergodic capacity in closed-form. Furthermore, an upper bound on the ergodic capacity is obtained. Monte Carlo simulations are used to validate the accuracy of our analysis.

关键词： Rain fading forward link prediction coding zero frequency Satellite systems closed forms

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Nonlinear Block Multi-diagonalization Precoding for High SHF Wide-band Massive MIMO in 5G

Nonlinear Block Multi-diagonalization Precoding for High SHF...

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IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communications

作者： Hiroshi Nishimoto Akinori Taira Hiroki Iura Shigeru Uchida Akihiro Okazaki Atsushi Okamura Information Technology R&D Center Mitsubishi Electric Corporation

ISBN: (纸本)9781509032556

In the paper, we propose a novel transmit precoding named "nonlinear block multi-diagonalization (NL-BMD) precoding," composed of block multi-diagonalization and adjacent inter-user interference pre-cancellation, for multiuser MIMO downlink toward 5G. It is revealed through computer simulations that, the proposed NL-BMD precoding yields up to 77% performance improvement in average sum-rate throughput and enables large-capacity transmission regardless of the user configuration, compared with the conventional block diagonalization precoding.

关键词： prediction coding 5G mobile communication multiple input multiple output systems SHF gene Superhigh frequency performance boost Computer Simulation

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