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Transmit Precoding Aided Spatial Modulation for Multi-User Correlated Large-Scale MIMO Channels 8

Transmit Precoding Aided Spatial Modulation for Multi-User C...

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8th International Symposium on Telecommunications (IST)

作者： Maleki, Marjan Mohamed-Pour, Kamal KN Toosi Univ Technol Dept Elect Engn Tehran Iran

ISBN: (纸本)9781509034352

We propose a transmit preprocessing aided spatial modulation (PSM) scheme for downlink of multi-user multiple-input multiple-output (MIMO) systems which exploits the spatial correlation matrices of users. In this way, array antennas in base station can be scaled to large dimensions while requiring reduced dimension channel state information at transmitter (CSIT). This property makes proposed PSM suitable for large-scale MIMO frequency-division-duplexing (FDD) systems in order to decrease the downlink training and the CSIT feedback from users in uplink. In the proposed PSM effort, a zero forcing (ZF) based two-stage precoding is designed in which the first stage is pre-beamforming based on second-order statistics to reduce the impact of the multi-user interference and at the second stage a precoding is done by exploiting reduced dimension effective channel to enable successful signal detection at each receiver. Our simulation results show that the proposed multi-user PSM scheme succeeds in eliminating multi-user interference and detecting transmitted spatial symbol which improves in large-scale regimes.

关键词： Interference MIMO Precoding Transmitting antennas Array signal processing Receiving antennas prediction coding multiple input multiple output systems Receiving antennas transmitting antennas array signal processing Multi-user Interference multi-user FOLH1 gene TRANSMITTING interference

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A Nearly Optimal Hybrid Precoder Design for Downlink Single-Carrier Wideband Massive MIMO Channels 30

A Nearly Optimal Hybrid Precoder Design for Downlink Single-...

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30th IEEE Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Kilcioglu, Emre Guvensen, Gokhan M. Middle East Tech Univ Elect & Elect Engn Dept Ankara Turkey Aselsan Inc Ankara Turkey

ISBN: (纸本)9781538681107

In this paper, an efficient hybrid precoding architecture is proposed for single-carrier (SC) downlink wideband spatially correlated massive MIMO channels. The design of two-stage beamformers is realized by using a virtual sectorization via second-order channel statistics based user grouping. The novel feature of the proposed architecture is that the effect of both inter-group-interference (due to non-orthogonality of virtual angular sectors) and the inter-symbol-interference (due to SC wideband transmission) are taken into account. While designing the analog beamformer, we examine the dimension reduction problem and proper subspace (beamspace) construction (by exploiting the joint angle-delay sparsity map and power profile of the multi-user channel) based on which a highly efficient spatio-temporal digital precoding is proposed.

关键词： Downlink intersymbolic interference multiple input multiple output systems broadband User groups prediction coding Broadband transmission

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Low Complexity Hybrid Beamforming and Precoding for 2D Planar Antenna Array mmWave Systems

Low Complexity Hybrid Beamforming and Precoding for 2D Plana...

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IEEE International Workshop on Signal Processing Systems (SiPS)

作者： Hsu, Kai-Neng Wang, Ching-Hung Lee, Yun-Yueh Huang, Yuan-Hao Natl Tsing Hua Univ Inst Commun Engn Hsinchu 30013 Taiwan Natl Tsing Hua Univ Dept Elect Engn Hsinchu 30013 Taiwan

ISBN: (纸本)9781467396042

The massive multiple-input multiple-output (MIMO) system utilizes a large number of antennas to enhance the throughput and reliability of 5G systems. Millimeter wave (mmWave) system is one of the important massive MIMO systems because its small wavelength allows the tightly package of large antenna array. This paper presents a low-complexity algorithm that can jointly determine the RF beamforming array vector and baseband precoding matrix for 2D planar antenna array in mmWave systems. The proposed antenna selection before the beamforming can reduce the dimension of the baseband precoding matrix. This study also proposes a sliding-window-based index selection for RF beamforming array vector. This index selection scheme not only reduces the baseband complexity but also enable highly paralleled hardware architecture. The antenna selection technique can reduce about 93% complexity of the SVD computation and the proposed precoding algorithm can reduce about 20-26% complexity of the previous work in a 16x8 2D planar antenna array MIMO systems.

关键词： prediction coding planar antenna arrays Beamforming multiple input multiple output systems ANTENNA Baseband Antenna arrays

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Study of Adaptive Detection for MIMO-OFDM Systems

Study of Adaptive Detection for MIMO-OFDM Systems

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15th Annual International Symposium on System-on-Chip (SoC)

作者： Suikkanen, Essi Janhunen, Janne Shahabuddin, Shahriar Juntti, Markku Univ Oulu Ctr Wireless Commun FIN-90014 Oulu Finland

ISBN: (纸本)9781479911905

Requirements for higher data rates and lower power consumption set new challenges for implementation of multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) receivers. Simple detectors have the advantage of low complexity and power consumption, but they cannot offer as good performance as more complex detectors. Therefore it would be beneficial to be able to adapt the detector algorithm to suit the channel conditions to minimize the receiver processing power consumption while satisfying the quality of service requirements. At low signal-to-noise ratio (SNR) and/or low rank channel, more power and computation resources could be used for detection in order to guarantee reliable communication, while in good conditions, a simple and less power consuming detector could be used. In this paper, we compare the performance of different detection algorithms. The performance results are based on simulations in long term evolution (LTE) system. The effect of precoding and hybrid automatic repeat request (HARQ) on the performance is shown. Implementation results based on the existing literature are included in the comparison. We discuss when it would be beneficial to use a complex detector and when a simple one would be sufficient. Also the switching criterion is discussed.

关键词： adaptive detector HARQ Long Term Evolution Quality of service detector Detection algorithms Power consumption multiple input multiple output systems prediction coding Data transfer rates Orthogonal frequency division multiplexing signal to noise ratios Receivers

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Power Efficient Low Complexity Precoding for Massive MIMO Systems

Power Efficient Low Complexity Precoding for Massive MIMO Sy...

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IEEE Global Conference on Signal and Information Processing (GlobalSIP)

作者： Sifaou, Houssem Kammoun, Abla Sanguinetti, Luca Debbah, Merouane Alouini, Mohamed-Slim King Abdullah Univ Sci & Technol Dept Elect Engn Thuwal Saudi Arabia Ecole Polytech Tunisie Signals & Syst Dept La Marsa Tunisia Univ Pisa Dipartimento Ingn Informaz Pisa Italy Ecole Super Elect Supelec Gif Sur Yvette France Huawei France R&D Math & Algorithm Sci Lab Paris France

ISBN: (纸本)9781479970889

This work aims at designing a low-complexity precoding technique in the downlink of a large-scale multiple-input multiple-output (MIMO) system in which the base station (BS) is equipped with M antennas to serve K single-antenna user equipments. This is motivated by the high computational complexity required by the widely used zero-forcing or regularized zero-forcing precoding techniques, especially when K grows large. To reduce the computational burden, we adopt a precoding technique based on truncated polynomial expansion (TPE) and make use of the asymptotic analysis to compute the deterministic equivalents of its corresponding signal-to-interference-plus-noise ratios (SINRs) and transmit power. The asymptotic analysis is conducted in the regime in which M and K tend to infinity with the same pace under the assumption that imperfect channel state information is available at the BS. The results are then used to compute the TPE weights that minimize the asymptotic transmit power while meeting a set of target SINR constraints. Numerical simulations are used to validate the theoretical analysis.

关键词： MIMO communication antenna arrays computational complexity polynomials precoding telecommunication power management MIMO systems SINR antennas asymptotic analysis base station multiple-input multiple-output system numerical simulations power efficient low complexity precoding signal-to-interference-plus-noise ratios transmit power truncated polynomial expansion Antennas Complexity theory Interference MIMO Polynomials Signal to noise ratio Vectors multiple input multiple output systems ANTENNA complexity classes Polynomial prediction coding Transmitter power signal to noise ratios SINR MIMO communication Complexity theory Antenna arrays

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Alternating Minimization for Hybrid Precoding in Multiuser OFDM mmWave Systems 50

Alternating Minimization for Hybrid Precoding in Multiuser O...

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50th Asilomar Conference on Signals, Systems, and Computers (ASILOMARSSC)

作者： Yu, Xianghao Zhang, Jun Letaief, Khaled B. Hong Kong Univ Sci & Technol Dept ECE Clear Water Bay Peoples R China Hamad Bin Khalifa Univ Doha Qatar

ISBN: (纸本)9781538639542

Hybrid precoding is a cost-effective approach to support directional transmissions for millimeter wave (mmWave) communications. While existing works on hybrid precoding mainly focus on single-user single-carrier transmission, in practice multicarrier transmission is needed to combat the much increased bandwidth, and multiuser MIMO can provide additional spatial multiplexing gains. In this paper, we propose a new hybrid precoding structure for multiuser OFDM mmWave systems, which greatly simplifies the hybrid precoder design and is able to approach the performance of the fully digital precoder. In particular, two groups of phase shifters are combined to map the signals from radio frequency (RF) chains to antennas. Then an effective hybrid precoding algorithm based on alternating minimization (AltMin) is proposed, which will alternately optimize the digital and analog precoders. A major algorithmic innovation is a LASSO formulation for the analog precoder, which yields computationally efficient algorithms. Simulation results will show the performance gain of the proposed algorithm. Moreover, it will reveal that canceling the interuser interference is critical in multiuser OFDM hybrid precoding systems.

关键词： Radio frequency Precoding Phase shifters OFDM MIMO Minimization Optimization prediction coding Phase shifters radiofrequency Orthogonal frequency division multiplexing multiple input multiple output systems HYBRID Hybrid electric vehicles

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System Capacity of 72 GHz mmWave Transmission in Hybrid Networks 84

System Capacity of 72 GHz mmWave Transmission in Hybrid Netw...

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84th IEEE Vehicular Technology Conference (VTC-Fall)

作者： Shi, Zhenyu Wang, Yi Huang, Lei Ma, Jianglei Huawei Technol Co Ltd Commun Technol Lab Jinsu Rd 200 Shanghai 201206 Peoples R China

ISBN: (纸本)9781509017010

Applying 6-100 GHz spectrum to mobile communications is a promising topic in 5G. In this paper, a hybrid network is presented where LTE system at low frequency works for seamless coverage and a mmWave system at 72 GHz works in hotspots for capacity enhancement. The scheme for the hybrid network includes: 1) frame structure and OFDM-based numerology for 72 GHz;2) time-space beam switching method for beamforming;3) zero-forcing MIMO precoding for interference cancellation;4) a channel model based on measurements in [1] for simulation. System-level simulations show that the hybrid network can achieve the system throughput over 1600 times higher than that in 2 GHz frequency band in case of two streams. MIMO precoding is not mandatory for capacity enhancements because the effect of intra-cell interference is not severe. Thus, 72 GHz is a promising spectrum band that can well meet 5G requirements from the aspects of capacity and maximum data rate.

关键词： hybrid network system capacity intra-cell interference FRAMED STRUCTURES prediction coding mobile communication Interference cancellation channel model Frequency bands multiple input multiple output systems

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Energy Efficiency of Adaptive Transmission for MIMO-OFDM Systems Over Polarization-Sensitive Channels

Energy Efficiency of Adaptive Transmission for MIMO-OFDM Sys...

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1st National Wireless Research Collaboration Symposium (NWRCS)

作者： Chen, Jun Pratt, Thomas Univ Notre Dame Dept Elect Engn Notre Dame IN 46556 USA

ISBN: (纸本)9781479950157

We employ an adaptive space-polarization MIMO testbed to investigate the energy efficiency of different adaptive precoded MIMO architectures, including co-polarized MIMO (CP-MIMO), dual-polarized MIMO (DP-MIMO), and space-polarization MIMO (SP-MIMO) architectures. The analysis quantifies the relative energy efficiencies and achievable rates when precoding is used. The performance is investigated over different polarization-sensitive channels and includes the impact of packet erasures. The adaptive precoding analysis relies on accurate and repeatable physical channel realizations from the testbed, which demands sophisticated hardware and testbed calibration procedures. Examples results from the testbed are presented, illustrating the relative energy efficiencies among the different MIMO architectures.

关键词： Antennas Correlation Gain MIMO Niobium OFDM Signal to noise ratio Dual-polarized Energy efficiency adaptive trasnmission precoding Energy efficiency multiple input multiple output systems prediction coding test bed signal to noise ratios ANTENNA niobium Adaptive transmission Orthogonal frequency division multiplexing Gain

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Mean Mutual Information Per Coded Bit based Precoding in MIMO-OFDM Systems

Mean Mutual Information Per Coded Bit based Precoding in MIM...

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IEEE 72nd Vehicular Technology Conference Fall 2010

作者： Tang, Taiwen Doostnejad, Roya Lim, Teng Joon Univ Toronto Dept Elect & Comp Engn Toronto ON Canada Redline Commun Inc Markham ON Canada

ISBN: (纸本)9781424435746

This work proposes a per-subband multiple input multiple output (MIMO) precoder selection technique for point-to-point MIMO orthogonal frequency division multiplexing (OFDM) based bit interleave coded modulation (BICM) systems with the soft-output minimum mean square error (MMSE) receiver. Given a pre-designed precoder codebook, the codeword/precoder that maximizes the mean of the mutual information per coded bit (MMIB) on all subcarriers within a subband is selected. The main advantages of this technique are the following: i) the precoder selection metric is explicitly related to BICM performance, thus it outperforms the previously proposed precoding techniques;ii) with commonly used unitary precoding codebooks, this technique works for an arbitrary number of transmit streams unlike the minimum singular value based method which does not work when the number of input streams is the same as the number of transmit antennas;iii) when multiple packets are transmitted and one precoder is used for these transmitted packets, an algorithm that combines the MMIB of each packet is proposed using an upper bound on the average packet error rate.

关键词： prediction coding multiple input multiple output systems Packet Binary digits Orthogonal frequency division multiplexing subband ABER Subcarriers Error analysis Mean square error based Input Stream

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Video coding with Adaptive Motion-Compensated Orthogonal Transforms

Video Coding with Adaptive Motion-Compensated Orthogonal Tra...

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29th Picture coding Symposium (PCS)

作者： Liu, Du Flierl, Markus KTH Royal Inst Technol Sch Elect Engn Stockholm Sweden

ISBN: (纸本)9781457720482

Well-known standard hybrid coding techniques utilize the concept of motion-compensated predictive coding in a closed-loop. The resulting coding dependencies are a major challenge for packet-based networks like the Internet. On the other hand, subband coding techniques avoid the dependencies of predictive coding and are able to generate video streams that better match packet-based networks. An interesting class for subband coding is the so-called motion-compensated orthogonal transform. It generates orthogonal subband coefficients for arbitrary underlying motion fields. In this paper, a theoretical signal model based on Gaussian distributions is discussed to construct a cost function for efficient rate allocation. Additionally, a rate-distortion efficient video coding scheme is developed that takes advantage of motion-compensated orthogonal transforms. The scheme combines multiple types of motion-compensated orthogonal transforms, variable block sizes, and half-pel accurate motion compensation. The experimental results show that this adaptive scheme outperforms individual motion-compensated orthogonal transforms by up to 2 dB.

关键词： Video coding subband coding prediction coding Orthogonal Transform Cost functions Gaussian distribution Motion compensation Packet switched networks Videotapes

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