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IEEE International Conference on Communications

作者： F. A. Khan C. Masouros T. Ratnarajah ECIT Queen's University of Belfast

ISBN: (纸本)9781457720529

In this paper, we investigate the outage performance of interference aided adaptive linear precoding in the downlink of a multiuser multiple-input-single-output (MISO) overlay cognitive radio (CR) network. While previous research studies on linear precoding techniques in CR network aim to limit or completely cancel the interference to the primary users while achieving maximum downlink throughput of the CR system, we here make use of adaptive linear precoding at the cognitive base station (CBS) to exploit the interference to the primary and the secondary systems. We show by analysis and simulations that the outage performance of the proposed precoding technique is significantly enhanced in comparison to the conventional techniques.

关键词： Cognitive radio Overlay linear precoding Zero-forcing Outage capacity prediction coding Downlink interference interference Cognitive radio Traditional technology chromium Self tuning

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LOW-COMPLEXITY linear precoding FOR MULTI-CELL MASSIVE MIMO SYSTEMS

LOW-COMPLEXITY LINEAR PRECODING FOR MULTI-CELL MASSIVE MIMO ...

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European Signal Processing Conference

作者： Abla Kammoun Axel Muller Emil Bjornson Merouane Debbah King Abdullah University of Science and Technology (KAUST) Alcatel-Lucent Chair

ISBN: (纸本)9781479946037

Massive MIMO (multiple-input multiple-output) has been recognized as an efficient solution to improve the spectral efficiency of future communication systems. However, increasing the number of antennas and users goes hand-in-hand with increasing computational complexity. In particular, the precoding design becomes involved since near-optimal precoding, such as regularized-zero forcing (RZF), requires the inversion of a large matrix. In our previous work [1] we proposed to solve this issue in the single-cell case by approximating the matrix inverse by a truncated polynomial expansion (TPE), where the polynomial coefficients are selected for optimal system performance. In this paper, we generalize this technique to multi-cell scenarios. While the optimization of the RZF precoding has, thus far, not been feasible in multi-cell systems, we show that the proposed TPE precoding can be optimized to maximize the weighted max-min fairness. Using simulations, we compare the proposed TPE precoding with RZF and show that our scheme can achieve higher throughput using a TPE order of only 3.

关键词： Massive MIMO linear precoding Low complexity Multi-cell systems Random matrix theory

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Fixed point error analysis of linear multichannel precoding for VDSL

Fixed point error analysis of linear multichannel precoding ...

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33rd IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Leshem, Amir Sayag, Eitan Sidiropoulos, Nicholas D. Bar Ilan Univ Sch Engn IL-52900 Ramat Gan Israel Tech Univ Crete Dept ECE Khania Greece

ISBN: (纸本)9781424414833

Crosstalk interference is the limiting factor in transmission over copper lines. Crosstalk cancellation techniques show great potential for enabling the next leap in DSL transmission rates. An important issue is the effect of finite world length on performance. In this paper we provide an analysis of the performance of linear zero-forcing precoders, used for crosstalk compensation, in the presence of quantization noise. We quantify analytically the trade off between quantization level and transmission rate degradation. We demonstrate, through simulations on real lines, the accuracy of our estimates. Finally, we show how to use these estimates as a design tool for DSL linear crosstalk precoders.

关键词： multichannel DSL vectoring linear precoding capacity estimates quantization

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linear precoding Based Iterative Detection Algorithm in Asynchronous MI MO-OFDM Systems

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China Communications 2012年第4期9卷

作者： Mo Taofu Liu Tian Shao Shihai Tang Youxi National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of China

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linear Minimum-Distance precoding for MIMO Systems Using Quadrature Amplitude Modulation

Linear Minimum-Distance Precoding for MIMO Systems Using Qua...

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International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Xu, Xiaodong Chen, Zhiyong Dai, Xuchu Univ Sci & Technol China Dept Elect Engn & Informat Sci Hefei 230027 Anhui Peoples R China

ISBN: (纸本)9781479903085

The criterion of maximizing the minimum Euclidean distance under the transmit power constraint is investigated in this paper for multiple-input multiple-output (MIMO) spatial multiplexing systems. With a real-valued constraint on the precoding matrix, a new low-complexity construction algorithm is proposed for arbitrary number of data streams and rectangular quadrature amplitude modulation (QAM) input. Feasible precoding matrices are constructed with distinctive ranks dropping from full rank to rank one, where the full-rank precoder is generated through an iteration mechanism, and the rank-one precoder is obtained by a paratneterized matrix associated with the particular modulation level of QAM constellation. In addition, the other rank-deficient precoders are formally constructed by a combination of two sub-precoders from lower dimensional space. The achievable minimum distance is also presented in closed-form expression for the proposed precoder, and simulation results validate the efficiency of the proposed precoder as compared with the traditional cross-form precoder.

关键词： MIMO linear precoding minimum Euclidean distance quadrature amplitude modulation

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Optimal precoding for full-duplex base stations under strongly correlated self-interference channels

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Frontiers of Information Technology & Electronic Engineering 2017年第6期18卷 808-816页

作者： Jun WANG Xiao-jie WEN Chuan HUANG Chao-jin QING College of Electrical and Information Engineering Southwest University for NationalitiesChengdu 610041China Beijing Institute of Satellite Information Engineering Beijing 100086China National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of ChinaChengdu 611731China School of Electrical and Information Engineering Xihua UniversityChengdu 610039China

We study the optimal precoding for a full-duplex (FD) system, where one FD multi-antenna base station (BS) respectively transmits to and receives from two half-duplex single-antenna mobile users (MUs) on the same time slot and frequency band. At the FD BS, the received signal from the desired MU is severely affected by the extremely strong self-interference (SI) from its transmit antennas to the receive antennas. In the presence of residual SI after imperfect SI cancellation, the downlink transmission rate maximization problem subject to a targeted uplink rate is formulated as a non-convex optimization problem to characterize the achievable rate region for the considered system. Considering the case in which the SI channel is strongly correlated, the above problem is transformed into a convex problem by exploiting the rank-one property of the SI channel, which can be solved efficiently. Finally, numerical results validate the effectiveness of the proposed scheme.

关键词： linear precoding Full-duplex Achievable rate region Strongly correlated self-interference channel

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Prescient precoding in Heterogeneous DSA Networks with Both Underlay and Interweave MIMO Cognitive Radios

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2013年第5期12卷 2252-2260页

作者： Mukherjee, Amitav Swindlehurst, A. Lee Hitachi Amer Ltd Santa Clara CA 95050 USA Univ Calif Irvine Dept Elect Engn & Comp Sci Irvine CA 92697 USA

This work examines a novel heterogeneous dynamic spectrum access network where the primary users (PUs) coexist with both underlay and interweave cognitive transmitters (UCTs and ICTs);all terminals being potentially equipped with multiple antennas. UCTs are allowed to transmit concurrently with PUs subject to interference constraints, while the ICTs employ spectrum sensing and are permitted to access the shared spectrum only when both PUs and UCTs are absent. We investigate the design of MIMO precoding algorithms for the UCT that increase the detection probability at the ICTs, while simultaneously meeting a desired Quality-of-Service target to the underlay cognitive receivers (UCRs) and constraining interference leaked to PUs. The objective of such a proactive approach, referred to as prescient precoding, is to minimize the probability of interference from ICTs to the UCRs and primary receivers due to imperfect spectrum sensing. We begin with downlink prescient precoding algorithms for multiple single-antenna UCRs and multi-antenna PUs/ICTs. We then present prescient block-diagonalization algorithms for the MIMO underlay downlink where spatial multiplexing is performed for a plurality of multi-antenna UCRs. Numerical experiments demonstrate that prescient precoding by UCTs provides a pronounced performance gain compared to conventional underlay precoding strategies.

关键词： Cognitive radio spectrum sensing spectrum underlay linear precoding multiuser MIMO interference mitigation

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Robust Multi-Antenna Multi-User precoding Based on Generalized Multi-Unitary Decomposition With Partial CSI Feedback

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2013年第2期62卷 596-605页

作者： Chua, Wee Seng Yuen, Chau Guan, Yong Liang Chin, Francois Nanyang Technol Univ Singapore 639798 Singapore Singapore Univ Technol & Design Singapore 138682 Singapore ASTAR Inst Infocomm Res Singapore 138632 Singapore

In this paper, we present a novel matrix decomposition method, called generalized multi-unitary decomposition (GMUD), and use it to achieve robust multi-antenna multi-user multiple-input-multiple-output (MIMO) precoding with limited and partial channel information feedback. GMUD transforms complex matrix {H} into H = P-theta,(r)R(r)Q(theta,r)(H), where R-r is a lower triangular matrix, and P-theta,(r) and Q(theta),(r) are unitary matrices. A unique feature of GMUD is that it gives multiple solutions of the unitary matrices P-theta,(r) and Q(theta),(r) based on two parameters, namely the direction parameter theta and magnitude parameter r. This property enables the GMUD precoder to steer the precoding vectors of different users to jointly optimize their performance. Compared with regularized-inverse precoding (an existing multi-user MIMO precoding technique that we have extended to handle multiple receive antennas), the advantages of GMUD precoding are that it requires only partial channel state information (CSI) from the users, and its performance is robust to CSI quantization.

关键词： linear precoding multi-user multiple-input-multiple-output (MIMO) channels partial feedback

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Quantized principal component selection precoding for spatial multiplexing with limited feedback

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IEEE TRANSACTIONS ON COMMUNICATIONS 2008年第5期56卷 838-846页

作者： Mun, Cheol Chungju Natl Univ Dept Elect Commun Engn Chungju 380702 Chungbuk South Korea

In this paper, for spatial multiplexing with limited feedback, a quantized principal component selection (QPCS) precoding scheme is proposed that achieves comparable capacity to the closed-loop multiple-input multiple-output (MIMO) and furthermore adapts to various fading channel conditions without any additional feedback bits and transmit channel state information (CSI). We propose a systematic design method for a codebook consisting of a finite number of unitary matrices based on a maximizing minimum distance criterion in the one-dimensional angular domain and show that the method outperforms the Grassmannian subspace packing method in various fading channel conditions. The proposed QPCS precoding scheme allows for adjustment of the precoding matrix based on limited feedback information on the principal vectors approximating a MIMO channel in the angular domain according to various channel conditions. Furthermore, for practical implementation of the QPCS precoding scheme, we propose a structured precoder optimization procedure and show that the proposed procedure induces a negligible capacity loss compared with the exhaustive precoder optimization, even with considerably reduced complexity.

关键词： MIMO systems spatial multiplexing linear precoding limited feedback antenna array processing

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Diversity Analysis of Group Vector Perturbation precoding

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IEEE TRANSACTIONS ON INFORMATION THEORY 2012年第10期58卷 6426-6432页

作者： Tosato, Filippo Sandell, Magnus Toshiba Res Europe Telecommun Res Lab Bristol BS1 4ND Avon England

We study the effect on diversity of using the sphere encoder-based vector perturbation (VP) technique of Peel et al. and the lattice reduction-aided techniques (Babai approximations) of Windpassinger et al. on a subset of the transmitted symbols. For a system with n diversity channels, we prove that the diversity order gap between the maximum diversity of n achieved by the full-size VP and the minimum diversity of 1 provided by linear precoding can be bridged by applying VP to a group of transmitted symbols. In particular, we prove that the diversity order is n - l, where l is the number of symbols that are not vector-perturbed. We show that this result holds true for lattice-reduction with both the rounding-off and nearest plane Babai approximations. The result shows that in terms of diversity, the group of vector-perturbed users counts as a single user. In fact, in a multiple-input and multiple-output Gaussian broadcast channel with l linearly precoded users, we can add up to n - l VP users and the diversity order for all users will decrease only by one, irrespective of how many VP users are added.

关键词： Diversity order lattice precoding linear precoding multiple-input multiple-output (MIMO) broadcast channel

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