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Multi-Keyhole Effect in MIMO AF Relay Downlink Transmission with Space-Time Block Codes

Multi-Keyhole Effect in MIMO AF Relay Downlink Transmission ...

引用

54th Annual IEEE Global Telecommunications Conference (GLOBECOM)

作者： Duong, Trung Q. Suraweera, Himal A. Yuen, Chau Zepernick, Hans-Jurgen Blekinge Inst Technol Kariskrona Sweden Singapore Univ Technol & Design Singapore Singapore

ISBN: (纸本)9781424492688

Multi-keyhole bridges the gap between single keyhole and full-scattering multiple-input multiple-output (MIMO) channels. In this paper, we therefore investigate the multi-keyhole effect on the MIMO amplify-and-forward (AF) relay downlink transmission with orthogonal space-time block codes. In particular, we derive the analytical symbol error rate (SER) expression for the considered system with arbitrary number of keyholes. Moreover, SER approximations in the high SNR regime for several important special scenarios of multi-keyhole channels are further derived. These asymptotic results provide important insights into the impact of system parameters on the SER performance. Our analysis is confirmed by comparing with Monte-Carlo simulations.

关键词： Antennas Downlink Fading IEEE Communications Society MIMO MIMO AF relay downlink transmission MIMO channel MIMO communication Monte Carlo methods Monte-Carlo simulation Relays SER SNR Signal to noise ratio amplify and forward communication amplify-and-forward relay multikeyhole bridge effect multikeyhole channel multiple-input multiple-output channel orthogonal codes orthogonal space-time block code relays single keyhole space-time block codes symbol error rate

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L1 Norm Minimization approach to MIMO detector 8

L1 Norm Minimization approach to MIMO detector

引用

8th International Conference on Signal Processing and Communication Systems, (ICSPCS)

作者： Hashimoto, Yo Konishi, Katsumi Takahashi, Tomohiro Uruma, Kazunori Furukawa, Toshihiro Tokyo Univ Sci Tokyo 162 Japan Kogakuin Univ Tokyo 160 Japan

ISBN: (纸本)9781479952557

This paper deals with the quadrature amplitude modulation (QAM) problem for the multiple-input multiple-output (MIMO) channel. Based on the maximum likelihood estimation, the QAM detection problem is formulated as an integer quadratic programming, which is a combinatorial problem and difficult to obtain exact solutions. In order to overcome combinatorial difficulties, this paper formulates the QAM detection problem as the l(o) norm minimization problem and relaxes it into a quadratic programming with the l(1) norm regularization. Utilizing and modifying the forward-backward splitting (FOBOS) algorithm, a new QAM detection algorithm is proposed. This algorithm has a trade-off between the computational cost and the detection accuracy, which depends on a parameter of the algorithm. Numerical simulations show that the proposed algorithm works well and achieves a good detection performance with less computational cost comparing with the semidefinite relaxation (SDR) based algorithm.

关键词： MIMO communication integer programming minimisation numerical analysis quadratic programming quadrature amplitude modulation FOBOS algorithm L1 norm minimization approach MIMO detector QAM detection algorithm SDR based algorithm combinatorial problem computational cost detection accuracy forward-backward splitting algorithm integer quadratic programming maximum likelihood estimation multiple-input multiple-output channel numerical simulations semidefinite relaxation based algorithm Approximation algorithms Detectors MIMO Quadrature amplitude modulation Signal processing algorithms Signal to noise ratio Vectors Quadrature amplitude modulation quadratic programming multiple input multiple output systems maximum likelihood estimation Signal processing algorithms signal to noise ratios MIMO communication Approximation algorithms Integer Programming Numerical Analysis

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Robust Training Sequence Design for Spatially Correlated MIMO channels and Arbitrary Colored Disturbance

Robust Training Sequence Design for Spatially Correlated MIM...

引用

22nd IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Shariati, Nafiseh Bengtsson, Mats KTH Royal Inst Technol Sch Elect Engn ACCESS Linnaeus Ctr Stockholm Sweden

ISBN: (纸本)9781457713484

In this paper, we study the design of optimal robust training sequences for multiple-input multiple-output (MIMO) channel estimation, based on known second order statistics of both the channel and the colored disturbance, but with an uncertainty in the channel covariance matrix. More specifically, the training sequences are designed by taking the least-favorable channel covariance component into account throughout an iterative algorithm. Numerical experiments are carried out to demonstrate the performance gained by employing the proposed design procedure and to compare it with other relevant schemes.

关键词： channel estimation Covariance matrix Eigenvalues and eigenfunctions MIMO MIMO communication Optimization Robustness Training channel covariance matrix channel estimation channel estimation colored disturbance covariance matrices iterative algorithm iterative methods multiple-input multiple-output channel robust training sequence design second order statistics spatially correlated MIMO channel statistical analysis

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Chase based multiuser detection for MIMO-CDMA systems

Chase based multiuser detection for MIMO-CDMA systems

引用

20th Annual Canadian Conference on Electrical and Computer Engineering

作者： Feng, Liu Soleymani, M. Reza Concordia Univ Dept Elect & Comp Engn Wireless & Satellite Commun Lab Montreal PQ H3G 1M8 Canada

ISBN: (纸本)9781424410200

In multiuser MIMO-CDMA systems, the layered space-time multiuser detector (LAST-MUD) can achieve high data rate and reliable communication by combining time-domain technique and space-domain technique. At the receiver side of LAST-MUD, the mathematical expression of the signals passing through the space-code matched filters is similar to the received signals of the V-BLAST system. This similarity makes it possible to apply some advance detection schemes originally used in single user V-BLAST system to multiuser MIMO-CDMA system. Recently, the B-Chase and L-Chase detectors have been developed to improve V-BLAST system performance. In this paper, we investigate the use of these two Chase based schemes to MIMO-CDMA system. The simulation results show that the performance of the L-Chase detector is worse than LAST-MUD due to the error in noise estimation, while the B-Chase detector can achieve a better performance than LAST-MUD.

关键词： code division multiple access (CDMA) multiuser detection multiple-input multiple-output channel V-BLAST Chase algorithm

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The Degrees of Freedom of Compute-and-Forward

The Degrees of Freedom of Compute-and-Forward

引用

IEEE International Symposium on Information Theory (ISIT)

作者： Niesen, Urs Whiting, Phil Alcatel Lucent Bell Labs Murray Hill NJ 07974 USA

ISBN: (纸本)9781457705953

We analyze the asymptotic behavior of compute-and-forward relay networks in the regime of high signal-to-noise ratios. We consider a section of such a network consisting of K transmitters and K relays. The aim of the relays is to reliably decode an invertible function of the messages sent by the transmitters. An upper bound on the capacity of this system can be obtained by allowing full cooperation among the transmitters and among the relays, transforming the network into a K X K multiple-input multiple-output (MIMO) channel. The number of degrees of freedom of compute-and-forward is hence at most K. In this paper, we analyze the degrees of freedom achieved by the lattice coding implementation of compute-and-forward proposed recently by Nazer and Gastpar. We show that this lattice implementation achieves at most 2/(1 + 1/K) <= 2 degrees of freedom, thus exhibiting a very different asymptotic behavior than the MIMO upper bound. This raises the question if this gap of the lattice implementation to the MIMO upper bound is inherent to compute-and-forward in general. We answer this question to the negative by proposing a novel compute-and-forward implementation achieving K degrees of freedom.

关键词： K relays K transmitters Lattices MIMO MIMO channel MIMO communication MIMO upper bound Noise Receivers Relays Transmitters Upper bound channel capacity channel coding compute-and-forward relay networks decoding degrees of freedom lattice coding multiple-input multiple-output channel network coding radio networks signal-to-noise ratio wireless relay network

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Low-Rank Optimization for Topological Interference Alignment in MIMO Networks 59

Low-Rank Optimization for Topological Interference Alignment...

引用

59th Annual IEEE International Conference on Communications (IEEE ICC)

作者： Liu, Xuan Zhang, Wenhao Xu, Zhao Hong Kong Polytech Univ Hong Kong Peoples R China Univ Sydney Sydney NSW Australia

ISBN: (纸本)9781728190549

In dense networks, interference becomes the main bottleneck for achieving high data rates. Topological interference management (TIM) is proposed to manage interference only based on network topology information to reduce the system overhead. In this paper we study the TIM problem in the multiple-input multiple-output (MIMO) interference channel with only the network connectivity information. For the general asymmetric channel with Mi antennas at each transmitter and Ni antennas at each receiver, we provide a topological interference alignment condition via carefully designing the structured transceivers. It turns out that the achievable degrees-of-freedom (DoFs) for each user grow linearly with min{M-i,N-i}. We further present a low-rank optimization approach to maximize the achievable DoFs, followed by developing a novel difference-of-convex programming algorithm with convergence guarantees. Numerical results demonstrate the effectiveness of the proposed methods for topological interference management in MIMO networks.

关键词： Topological interference management multiple-input multiple-output channel low-rank optimization difference-of-convex programming

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Parallel detection for V-BLAST system

Parallel detection for V-BLAST system

引用

IEEE International Conference on Communications

作者： Li, Y Luo, ZQ InnovlCs Corp Los Angeles CA 90064 USA

ISBN: (纸本)0780374002

Recent studies unveiled that huge channel capacity can be achieved by employing multi-element antenna arrays at both transmitter and receiver. Foschini ***. proposed a vertical Bell Laboratories layered space-time (V-BLAST) system with a detection algorithm based on decision feedback. This system is computational efficient and yet supporting a high data rate. However, the detection algorithm shows unsatisfactory performance when equal number of antennas are employed at both ends. In this paper, a parallel detection algorithm is proposed to improve the performance in such scenarios. The detector consists of many low complexity sub-detectors, all of them operating in parallel on a sub-channel matrix. By selecting the submatrix appropriately the overall performance can be improved substantially.

关键词： V-BLAST multiple-input multiple-output channel decision feedback

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