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Equalization and Precoding in Multi-User MIMO Relaying Systems and Their Diversity Bottleneck

Equalization and Precoding in Multi-User MIMO Relaying Syste...

引用

WSA 2017;21th International ITG Workshop on Smart Antennas

作者： Sebastian Stern Yeicatl Ramos Vazquez Robert F. H. Fischer

In this paper, equalization and precoding in multiuser multiple-input/multiple-output (MIMO) relaying systems are considered. In particular, the user devices are connected to relays or small base stations which only cover small areas, socalled small cells. Via wireless backhaul, the relays are in turn connected to a central base station, forming a two-hop multiuser relaying system. It is shown how a naive realization of these relaying systems provokes a diversity bottleneck in the small cells, degrading the overall system performance. A strategy to prevent this bottleneck is proposed in combination with an antenna selection strategy for backhaul communication. Results obtained from numerical simulations are provided to complement the theoretical considerations. To this end, lattice-reduction-aided schemes are used to enable a full-diversity channel equalization.

关键词： prediction coding Equalization relay Traffic Bottlenecks relaying BASE STATION multiple input multiple output systems return stroke Relay systems System performance wireless

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Performance Analysis of Diagonal Precoding for Alamouti STBC over Nakagami-m Fading Channels

Performance Analysis of Diagonal Precoding for Alamouti STBC...

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IEEE Vehicular Technology Conference

作者： Ankit Garg Manav R. Bhatnagar Department of Electrical Engineering Indian Institute of Technology-Delhi

ISBN: (纸本)9781509016990

In this paper, we study the problem of one bit imperfect feedback based diagonal precoding for Alamouti space-time block code in a 2 × 1 multiple-input single-output (MISO) communication system. The communication links are assumed to be Nakagami-m distributed. An accurate bit error rate (BER) expression of the considered MISO system is derived with erroneous feedback by using the order statistics. The average BER of the precoding scheme is minimized to find the optimized transmit weights. Further, we also derive the Shannon capacity of the scheme by using the moment generating function approach. Simulated and analytical results show that a significant capacity gain is achieved by the considered scheme as compared to the uniform power allocation over the Nakagami-m fading channels.

关键词： space time block coding prediction coding Moment generating function Fading channels Bit error rate power splitting Diagonal multiple-input single-output Telecommunication links

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Minimum Interfering Power Based on Interference Matrix Reconstruction for IA

Minimum Interfering Power Based on Interference Matrix Recon...

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World Congress on Intelligent Control and Automation

作者： Xueying Diao Yibing Li Dandan Liu College of Information and Communication Engineering Harbin Engineering University Heilongjiang Province Harbin China Coal Technology Engineering Group Chongqing Research Institute No.55 Shangqiaosancun 40037 Chongqing China

ISBN: (纸本)9781467384155

Interference alignment (IA) is a promising interference management technique to efficiently improve the degrees of freedom and system capacity in a K-user interference network. The existence of the interference channel (IC) is the main reason why communication system is interference limited. However, in most cases, transmission performance of interference sub-channels has remarkable differences. Existing IA schemes ignore the information of IC, resulting in limiting the performance of IA. Thus, this paper proposes an improved scheme, that is, minimum interfering power based on interference matrix reconstruction for IA. We firstly choose the influential sub-channels via comparing the interfering singular value with a predefined threshold, and then we target the interfering power minimization to achieve the IA solution. As the interfering power can be expressed as the trace of interfering matrix and we have known the Frobenius norm is less than or equal to the nuclear norm, we change the optimization function above into a nuclear norm optimization problem. Compared with existing schemes, the novel approach takes the influential interfering sub-channels into consideration, which makes the optimization process more pertinent and further eliminates interference at each receiver. Besides, proposed scheme can achieve the global optimal solution by utilizing nuclear norm optimization. Simulation results show the proposed algorithm outperforms previous approaches for improving the system capacity.

关键词： Interference Optimization Receivers Minimization Precoding Matrix decomposition Signal to noise ratio INFORMATION ASSURANCE signal to noise ratios matrix decomposition interference Receivers prediction coding interference system capacity Euclidean matrix norm

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System Outage Probability Performance Analysis Based on Blind Interference Cancelation in Two-Way Relay Network

System Outage Probability Performance Analysis Based on Blin...

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International Conference on Intelligent Computing, Automation and Systems (ICICAS)

作者： Bin Jiang Xianwen He Zhizhong Li Gang Yang Naval Submarine Academy Qingdao China

ISBN: (数字)9781728161068

ISBN: (纸本)9781728161075

Additional self-interference is introduced in two-way relay network (TWRN) while spectral efficiency is increased. As for self-interference problem in amplify-and-forward (AF) modes, a kind of blind interference cancelation (BIC) scheme is employed. The scheme can realize self-interference cancellation and desired signal separation with unknown channel status information by signal precoding operating at transmitting node. In this way, the impact of residual self-interference caused by imperfect channel estimation on TWRN performance is eliminated. Based on this, the closed expression and asymptotic expression of the system outage probability (OP) under M-phase shift keying (MPSK) modulation is derived. Moreover, the influence of SOP performance with channel estimation error under different schemes is analyzed. The correctness of the theoretical derivation is verified by simulation comparison.

关键词： amplify and forward communication channel estimation error statistics interference suppression phase shift keying precoding probability relay networks (telecommunication) telecommunication network reliability channel estimation telecommunication network reliability prediction coding Phase shift keying suppression of interference Interference cancellation Probability self-interference Relay networks Error analysis channel status

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Coordinated Linear Precoding in Downlink Multicell MU-MISO OFDMA Networks

Coordinated Linear Precoding in Downlink Multicell MU-MISO O...

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IEEE Vehicular Technology Conference

作者： Mirza Golam Kibria Hidekazu Murata Susumu Yoshida Graduate School of Informatics Kyoto University Kyoto Japan

ISBN: (纸本)9781467361866

This paper considers coordinated linear precoding in downlink multicell multiuser orthogonal frequency-division multiple access (OFDMA) network. A less-complex, fast and provably convergent algorithm that maximizes the weighted sum-rate with per base station (BS) transmit power constraint is formulated. We approximate the nonconvex weighted sum-rate maximization (WSRM) problem with a solvable convex form by means of sequential parametric convex approximation (SPCA) approach. The second order cone program (SOCP) formulations of the objective function and constraints of the optimization problem are derived through proper change of variables, first order linear approximation and hyperbolic constraints transformation, etc. The algorithm converges to the suboptimal solution taking fewer number of iterations in comparison to other known iterative WSRM algorithms. Finally, numerical results are presented to justify the effectiveness and superiority of the proposed algorithm.

关键词： Weighted sum-rate maximization Coordinated linear precoding Convex approximation multicell OFDMA prediction coding Downlink Constrained optimization Linear approximation iterative methods Objective function

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Performance Analysis of Linear Precoding for Secure Multiuser MIMO Systems With a Multiple-Antenna Eavesdropper

Performance Analysis of Linear Precoding for Secure Multiuse...

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IEEE Global Communications Conference

作者： Hao Deng Hui-Ming Wang Chaowen Liu Wenjie Wang School of Physics and Electronics Henan University School of Electronic and Information Engineering Xi'an Jiaotong University Ministry of Education Key Lab for Intelligent Networks and Network Security Xi'an Jiaotong University

ISBN: (纸本)9781479959532

In this paper, we investigate the secrecy performance of matched-filter (MF) and zero-forcing (ZF) precoding in a multiuser massive multiple-input multiple-output (MIMO) system with a multi-antenna passive eavesdropper. For the two precoding schemes, we find that the equivalent wiretap channels are similar and thus the eavesdropper achieves the approximate same sum-rate. Closed-form expressions of ergodic secrecy sum-rate (ESSR) are derived for the both schemes in the low and high signal-to-noise ratio (SNR) regimes. We show that a positive ESSR of MF scheme may be not achieved when the BS simultaneously serves more than two users with high transmit power, while the ESSR of ZF scheme always grows with the number of the served users. On the contrast, MF scheme is better than ZF scheme in the low SNR regime. Simulation results corroborate the analytic results.

关键词： multiple input multiple output systems prediction coding zero frequency Scheme Transmitter power Privacy signal to noise ratios

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Impact of Reconfigurable Antennas on MU-MIMO over measurements in a Reverberation Chamber

Impact of Reconfigurable Antennas on MU-MIMO over measuremen...

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IEEE Vehicular Technology Conference

作者： Simon Begashaw Xaime Rivas Rey Kapil R. Dandekar Drexel University Philadelphia PA

ISBN: (纸本)9781538663592;9781538663585

While the theoretical multiplexing gains of multiuser (MU) MIMO are substantial, the performance gains in practical systems such as IEEE 802.11ac and LTE/LTE-Advanced have been limited. One of the key limiting factors are spatially correlated user channels. In this paper, we evaluate the impact of pattern reconfigurable antennas (PRA) on downlink MU-MIMO transmission. PRAs are capable of dynamically adjusting their radiation pattern, providing an additional degree of freedom that can be leveraged to improve MU-MIMO performance by treating the array configuration and radiation characteristics as additional components in the joint optimization of adaptive system parameters. We conduct measurements in a statistically repeatable environment and demonstrate the gains provided by pattern diversity in decorrelating user channels. Our experimental results show significant gains in SINR and achievable sum rates of MU-MIMO linear precoders when appropriate directional beams are used to decorrelate the channel matrices and provide directional gain.

关键词： adaptive antenna arrays antenna radiation patterns linear codes MIMO communication optimisation precoding reverberation chambers wireless channels reverberation chambers adaptive antenna arrays MIMO communication antenna radiation patterns wireless channels linear codes prediction coding Degree of freedom unilateral gain ANTENNA configurability

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Full-Diversity Precoding Design of Bit-Interleaved Coded Multiple Beamforming with Orthogonal Frequency Division Multiplexing

Full-Diversity Precoding Design of Bit-Interleaved Coded Mul...

引用

IEEE Global Communications Conference

作者： Boyu Li Ender Ayanoglu Center for Pervasive Communications and Computing Department of Electrical Engineering and Computer Science The Henry Samueli School of Engineering University of California - Irvine Irvine California 92697-2625

ISBN: (纸本)9781479913510

For Multiple-Input Multiple-Output (MIMO) systems with frequency selective fading channels, Bit-Interleaved Coded Multiple Beamforming (BICMB) with Orthogonal Frequency Division Multiplexing (OFDM) can offer both spatial and multipath diversity, making it an important technique. It was proved that full diversity of BICMB-OFDM can be achieved with a condition of R_cSL ≤ 1, where R_c, S, and L are the code rate, the number of parallel streams at each subcarrier, and the number of channel taps, respectively. In this paper, the precoding technique is applied to overcome the full diversity restriction with the minimum achievable decoding complexity.

关键词： BICMB OFDM precoding technique Orthogonal frequency division multiplexing Bit interleaved coded bit interleaving prediction coding Beamforming Frequency-selective fading channels code rate multiples Subcarriers multiple input multiple output systems

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Efficient hybrid space-ground precoding techniques for multi-beam satellite systems

Efficient hybrid space-ground precoding techniques for multi...

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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Nuan Song Tao Yang Martin Haardt Nokia Bell Labs China Shanghai China Communications Research Laboratory Ilmenau University of Technology Germany

ISBN: (纸本)9781509041183

Multi-beam mobile satellite systems aim at providing broadband and high speed mobile services over a large area to achieve a high system throughput, where hybrid space-ground beamforming is one of the most promising candidates for ground-based beamforming techniques. It not only reduces the feeder link bandwidth to save spectral resources, but also takes advantages of both the on-ground and on-board processing, exhibiting a good trade-off of the performance and the space/ground complexity. In this paper, we propose an efficient hybrid space-ground precoding technique for multi-beam mobile satellite systems. It consists of coarse on-board beamforming and reduced-rank on-ground beamforming based on the feed selection of the phased array antenna. The advantages of the proposed hybrid precoding are shown as compared to the fully on-ground beamforming as well as the existing solutions.

关键词： multi-beam mobile satellite systems on-ground beamforming on-board beamforming hybrid space-ground beamforming feed selection MIMO multi-beam multiple input multiple output systems Beamforming Satellite systems prediction coding mobile communication satellite HYBRID Hybrid electric vehicles

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Hybrid Linear Precoding Strategy for Multiuser Massive MIMO Millimeter Wave Systems

Hybrid Linear Precoding Strategy for Multiuser Massive MIMO ...

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International Conference on Image and Signal Processing and their Applications (ISPA)

作者： Baghdad HADJI Lamya FERGANI Mustapha DJEDDOU Department of Telecommunication University of Science and Technology Algiers Algeria Communication System Laboratory Military Polytechnic School Algiers Algeria

ISBN: (纸本)9781728131573

Multiuser-MIMO Millimeter wave based communication system has been considered as a current area of research for the future communication systems to serve multi-user simultaneously with a multiple data streams. Hybrid analog/digital architecture is the most satisfied architecture of the mmWave MIMO communication objectives and can be applied at both the base and mobile stations. Thus, exploiting the hybrid pre-coding/combining techniques offered by this architecture allow the realization of the multi-stream/multi-user transmission. We propose in this paper, a low computational complexity linear hybrid precoding schemes based on classical linear precoding and SVD decompostion of each channel user to avoid information exchange by the feedback where each user is powered by hybrid architecture. The simulation results demonstrate that our proposed two-stage hybrid linear precoding schemes can achieve a higher spectral efficiency compared with existing methods where each user is equipped with a single combiner and confirms its better management of the multi-user interference.

关键词： Millimeter wave multi-user MIMO Massive MIMO Hybrid precoding MRT ZF MMSE zero frequency mean radiant temperatures Mini Mental State Examination prediction coding COMMUNICATION SYSTEMS millimeter wave Multi-user Interference HYBRID Hybrid electric vehicles composite structures Building construction ARCHITECTURE information exchange spectral efficiency

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