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IEEE International Conference on Electro-Information Technology (EIT)

作者： Norouzi, Mandana Wu, Yuteng Chahande, Pradnya Macias, Fernando Alonso Atkin, G. E. IIT Dept Elect & Comp Engn Chicago IL 60616 USA

ISBN: (纸本)9781467352079;9781467352086

In this paper a new space time coding, which is suitable for high data rate communications is proposed. In this approach data is encoded by using a decomposition of a circulant matrix and the output of encoder is splitted into N streams to be transmitted simultaneously to N transmit antennas. The performance of this multiple input multiple output system is evaluated in a Rayleigh fading channel. Its performance in terms of symbol error rate, diversity gain and complexity is obtained. Simulation results show that with a perfect channel estimator, when channel state information (CSI) is available at the receiver, the Circulant space time code (CSTC) has a better symbol error rate via signal to noise ratio in compared to the spatial multiplexing and near to orthogonal space time block code.

关键词： space time coding multiple input multiple output Circulant matrix Orthogonal space time coding Alamouti space time code

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Resource allocation for multiuser space-time coding based OFDM systems with QoS provision 62

Resource allocation for multiuser space-time coding based OF...

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62nd IEEE Vehicular Technology Conference

作者： Hu, ZP Zhu, GX Xiao, X Chen, ZL Huazhong Univ Sci & Technol Dept Elect & Informat Engn Wuhan 430074 Peoples R China

ISBN: (纸本)0780391527

In this paper, resource allocation problems for multiuser space-time block coding based OFDM systems are investigated. Specifically, with the goal of minimizing overall transmit power, a subcarrier, power assignment criterion and an recursive allocation algorithm which fulfills users' QoS requirements, including bit error rate and data rate constraint are proposed. Analyses and numeric simulations demonstrate that the proposed subcarrier assignment schemes can exploit multiuser diversity to provide significant system-level performance improvement and guarantee different users' QoS requirements effectively.

关键词： space time coding OFDM adaptive subcarrier allocation QoS

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Detection of MIMO Radar With space-time coding in Compound Gaussian Environment

Detection of MIMO Radar With Space-Time Coding in Compound G...

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International Conference on Mechatronics and Intelligent Materials

作者： Peng, Ma Zhou Qingsong Xing, Yang Inst Elect Engn Dept Informat Hefei Anhui Peoples R China Inst Elect Engn State Key Lab Pulsed Power Laser Technol Hefei Anhui Peoples R China

ISBN: (纸本)9783037850695

This paper mainly deals with the target detecting problem of MIMO radar with space time coding (STC) in compound Gaussian environment, which include the correlated Gaussian clutter and uncorrelated Gaussian scattering. The detector based on generalized likelihood ratio test (GLRT) criterion is studied, and two-step design procedure is adopted when the covariance of clutter is unknown. Specifically, a suitable GLRT estimate based on referenced data is inserted into the detector to make fully adaptive. Some numerical results are given, showing that the derived 2s-GLRT of STC MIMO radar can provide a good performance in spikier clutter and the adaptive loss is acceptable.

关键词： MIMO radar space time coding detection tow-step GLRT

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Antenna Effects Consideration for space-time coding UWB-Impulse Radio System in IEEE 802.15 Multipath Channel

Antenna Effects Consideration for Space-Time Coding UWB-Impu...

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2nd International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM 2006), vol.2

作者： Yu-Feng Ruan Xiang-Quan Shi Department of Electronic Engineering Nanjing University of Science and Technology of PLA China

In our previous work [1], we investigated how the temporal and spatial diversity influence the multiple access performance and how the space-time coding technique is used to mitigate the multiple access interference (MAI) and the inter-symbol interference (ISI) thereby improving the bit error rate (BER) performance of the ultra wideband (UWB) impulse radio (IR) system, where the antenna effects is not involved among the performance evaluation process. Whereas in this paper, an ultra-wideband dielectric resonator antenna (DRA) proposed in [2] is used for transmitting and receiving short pulses which occupy ultra-wide bandwidth. Numerical results show that the DRA is a good candidate for transmitting and receiving short pulses and the space-time coding technique is an efficient mean to improve the performance of ultra wideband impulse radio system under IEEE 802.15 multipath environment.

关键词： space time coding Transmit diversity Antenna Multipath UWB

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Suitable combination of channel coding and space time schemes for moderate-to-high spectral efficiency MIMO systems

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AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS 2010年第7期64卷 595-606页

作者： Khalighi, Mohammad-Ali Helard, Jean-Francois Sadough, Seyed Mohammad-Sajad Bourennane, Salah Inst Fresnel Ecole Cent Marseille CNRS UMR 6133 Marseille France Inst Elect & Telecommun Rennes Rennes France Shahid Beheshti Univ Fac Elect & Comp Engn Tehran Iran

In order to propose practical solutions for future communication systems employing a combination of multiple-input multiple-output (MIMO) structures and orthogonal frequency division multiplexing (OFDM), we analyse and compare the performances obtained by orthogonal and non-orthogonal space time coding schemes. A simple iterative detector based on soft parallel interference cancellation (Soft-PIC) is used in the receiver in order to cope with the interference terms when using non-orthogonal schemes. First, we propose a modification of the log-likelihood ratio (LLR) calculation part in the Soft-PIC detector that provides an improvement of the receiver performance compared to previous implementations of this detector. Then, the performances of different space time schemes proposed for two, three or four antennas at the transmitter and two antennas at the receiver are compared. In the case of perfect channel estimation, a substantial gain is obtained by using the appropriate non-orthogonal schemes for moderate-to-high spectral efficiency MIMO systems, which justifies the increased complexity of the receiver. This conclusion is conditioned to the presence of sufficient frequency diversity that is the case in a practical system. We also study the case of imperfect channel estimation at the receiver and discuss the choice of the appropriate space time scheme. The gain offered by the non-orthogonal schemes is confirmed in that case, specifically for high spectral efficiency systems. (C) 2009 Elsevier GmbH. All rights reserved.

关键词： MIMO systems space time coding OSTBC LD codes Iterative detection

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On a space time parallel iterative coding scheme and its performance evaluation

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WIRELESS COMMUNICATIONS & MOBILE COMPUTING 2003年第5期3卷 629-639页

作者： Hou, J Lee, MH Chonbuk Natl Univ Sch Elect Informat Engn Inst Informat & Commun Chonju 561756 South Korea

This paper proposes a class of space time parallel (STP) iterative coding scheme to combat fading for wireless MIMO systems. In addition to the inner iterations, the super iterations (or outer iterations) and symbol interleaved space time coding are employed to achieve additional time diversity and coding gain in fading channel. The numerical and simulation results demonstrate that the STP iterative coding scheme may make use of all the advantages of transmit diversity and time diversity in wireless MIMO systems. In particular, in the case of STP turbo codes, about I dB BER enhancement and half calculation time reduction from conventional space time (ST) turbo codes designs are achieved;in the case of low density parity check (LDPC) codes, about 0.8 dB improvement from conventional ST LDPC designs is obtained. Copyright (C) 2003 John Wiley Sons, Ltd.

关键词： space time coding iterative coding parallel decoding

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Analysis of pilot-assisted channel estimators for OFDM systems with transmit diversity

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IEEE TRANSACTIONS ON BROADCASTING 2006年第2期52卷 193-202页

作者： Shen, Dongxu Diao, Zhifeng Wong, Kai-Kit Li, Victor O. K. Univ Hong Kong Dept Elect & Elect Engn Hong Kong Hong Kong Peoples R China Univ Hull Dept Engn Kingston Upon Hull HU6 7RX Yorks England

In this paper, we analyze the performance of pilot-assisted least square (LS) and minimum mean squared error (MMSE) channel estimators for orthogonal frequency division multiplexing (OFDM) systems with transmit antenna diversity. We first provide a design of orthogonal pilot sequences to simplify the estimators. We then analyze the mean squared error (MSE) performance, and study the leakage effect. When a channel tap is not sample-spaced, our analysis shows that the power of the channel tap will leak to not only other taps of the same antenna, but also taps belonging to other antennas. The leakage across antennas is mainly determined by the phase separation between pilot sequences, which is further related to the ratio between the number of pilots and number of antennas. We demonstrate that the MSE performance can be improved if more pilots are used, or fewer channels are estimated simultaneously.

关键词： Channel estimation leakage effect OFDM pilot sequence space time coding

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Experimental Study of MIMO-OFDM Transmissions at 94 GHz in Indoor Environments

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IEEE ACCESS 2017年 5卷 7488-7494页

作者： Sanchis-Borras, Conception Martinez-Ingles, Maria-Teresa Molina-Garcia-Pardo, Jose-Maria Pascual Garcia, Juan Rodriguez, Jose-Victor Univ Catolica San Antonio Murcia Dept Tech Sci Murcia 30107 Spain Univ Politecn Cartagena Minist Def San Javier Air Force Base Univ Ctr Def Santiago De La Ribera 30720 Spain Univ Politecn Cartagena Informat Technol & Commun Dept Cartagena 30202 Spain

Millimeter wave (mm-wave) frequencies have been proposed to achieve high capacity in 5G communications. Although meaningful research on the channel characteristics has been performed in the 28-, 38-, and 60-GHz bands in both indoor and short-range scenarios, only a small number of trials (experiments) have been carried out in other mm-wave bands. The objective of this paper is to study the viability and evaluate the performance of the 94-GHz frequency band for MIMO-OFDM transmission in an indoor environment. Starting from a measurement campaign, the performance of MIMO algorithms is studied in terms of throughput for four different antenna configurations.

关键词： MIMO mm-wave 94 GHz OFDM space time coding

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Constellation and Rate Selection in Adaptive Modulation and coding Based on Finite Blocklength Analysis and Its Application to LTE

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2014年第10期13卷 5496-5508页

作者： Meng, Jin Yang, En-Hui Univ Waterloo Dept Elect & Comp Engn Waterloo ON N2L 3G1 Canada

This paper tackles the constellation and channel coding rate selection problem in adaptive modulation and coding (AMC) for MIMO systems. Based on information theoretical results in finite blocklength analysis of channel capacity, a new selecting rule is proposed for narrow-band MIMO systems, and further extended to wide-band MIMO OFDM systems over channels subject to frequency-selective fading. When applied to Long Term Evolution (LTE) systems, the proposed selecting rule yields better performance in comparison with existing rules in the literature.

关键词： Finite blocklength analysis of channel capacity Taylor expansion adaptive modulation and coding throughput MIMO space time coding OFDM flat and frequency-selective fading LTE

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A Low-Delay MAC Solution for MIMO Ad Hoc Networks

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2009年第1期8卷 130-135页

作者： Rossetto, Francesco Zorzi, Michele Univ Padua Dept Informat Engn I-35131 Padua Italy

Beamforming is regarded as a key element for multiantenna ad hoc networks. However, it cannot simultaneously provide the omnidirectional and long-range coverage required by broadcast transmissions [1]-[4], a problem known as the Asymmetry in Gain. We propose a scheme for control packet exchange over an extended radio coverage based on a space time Code technique. This solution is shown to solve the Asymmetry in Gain issue, and is proposed as part of a MAC protocol for MIMO ad hoc networks, whose performance benefits include increased throughput and reduced delay and energy consumption.

关键词： space time coding MIMO ad hoc networks MAC protocols

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