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Adaptive OFDM system based on space-time block code

Journal of Shanghai University(English Edition) 2006年第5期10卷 421-424页

作者：孙绪宝钟顺时 School of Communication and Information Engineering Shanghai University Shanghai 200072 P.R. ChinaSchool of Sciences Shandong University of Science and Technology Qingdao 266510 P.R. China School of Communication and Information Engineering Shanghai University Shanghai 200072 P.R. China

To satisfy the request of wireless communication for new generation communication system, a new scheme consisting of a combination of adaptive technology and space-time code-OFDM is presented. The proposed method, exploits adaptive bit allocation scheme over multipath fading channel. Numerical simulations have shown that the proposed scheme can greatly improve the performance of non-adaptive STBC-OFDM system.

关键词： space-time coding adaptive transmit diversity.

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NASH BARGAINING SOLUTION BASED SUBCARRIER ALLOCATION FOR UPLINK SC-FDMA DISTRIBUTED ANTENNA NETWORK

NASH BARGAINING SOLUTION BASED SUBCARRIER ALLOCATION FOR UPL...

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2012 3rd IEEE International Conference on Network Infrastructure and Digital Content

作者： Yusuke SATO Ryusuke,MATSUKAWA Tatsunori OBARA Fumiyuki ADACHI Dept. of Electrical and Communication Engineering Graduate School of Engineering Tohoku University 6-6-05 Aza-Aoba Aramaki Aoba-ku Sendai 980-8579 Japan

The system capacity of single-carrier frequency division multiple access (SC-FDMA) can be increased by allocating subcarriers to users who are in a good channel condition. However, there is a tradeoff between system capacity and fairness among users. Nash bargaining solution (NBS) in cooperative game theory can be used to solve this tradeoff problem. However, very high computational complexity is required to find the NBS. In this paper, we propose a reduced complexity suboptimal NBS based subcarrier allocation, which requires lower computational complexity while achieving the system capacity and fairness among users similar to the NBS. The proposed suboptimal NBS subcarrier allocation is applied to distributed antenna network (DAN) using frequency- domain space-time transmit diversity (FD-STTD). Numerical computation results show that the proposed NBS based subcarrier allocation achieves the system capacity comparable to Proportionally Fair (PF) map while achieving a higher fairness than PF map.

关键词： SC-FDMA Distributed antenna network space-time coding Nash bargaining solution

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Frequency-domain Channel Estimation and Tracking Schemes for space-time Coded OFDM Systems

Frequency-domain Channel Estimation and Tracking Schemes for...

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第三届IEEE无线通讯、网络技术暨移动计算国际会议

作者： Hui Guo Lihong Wang Department of Communication Engineering Henan Polytechnic University Jiaozuo China

Two Channel estimation and tracking schemes for space-time coded orthogonal frequency division multiplexing (OFDM) systems are proposed in frequency domain. Since the processing are all made in frequency domain, the computational complexity of the proposed schemes is reduced dramatically compared with the time-domain scheme. The two proposed schemes both use STBC-pattern training symbols during the training period. During the data transmission period, the first proposed scheme use the decision-directed tracking algorithm, and the second proposed scheme use an iterative algorithm to track the channel variation. The two schemes both can improve the system performance, and the second scheme can bring more performance gain even with small iteration times. The performances of the proposed schemes are demonstrated by computer simulation in the typical indoor channel.

关键词： Channel estimation channel tracking space-time coding OFDM

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Cross-layer Design for space-time coded MIMO Systems over Rice Fading Channel

Cross-layer Design for Space-time coded MIMO Systems over Ri...

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2011 International Conference on Computers, Communications, Control and Automation

作者： Xiangbin Yu Tingting Zhou Xiaoshuai Liu Xin Yin College of Information Science and Technology Nanjing University of Aeronautics and Astronautics National Mobile Communication Research Laboratory Southeast University

A cross-layer design(CLD) scheme for space-time coded MIMO systems over Rice fading channel is presented by combining adaptive modulation and automatic repeat request,and the corresponding system performance is investigated *** fading gain switching thresholds subject to a target packet error rate(PER) and fixed power constraint are *** to these results, and using the generalized Marcum Q-function, the calculation formulae of the average spectrum efficiency(SE) and PER of the system with CLD are *** a result, closed-form expressions for average SE and PER are obtained. These expressions include some existing expressions in Rayleigh channel as special cases. With these expressions, the system performance in Rice fading channel is evaluated effectively. Numerical results verify the validity of the theoretical analysis. The results show that the system performance in Rice channel is effectively improved as Rice factor increases, and outperforms that in Rayleigh channel.

关键词： Cross-layer design space-time coding Rice fading spectrum efficiency MIMO

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Statistical Approximation Based on space-time Coded for MIMO-OFDM Systems

Statistical Approximation Based on Space-Time Coded for MIMO...

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第二十二届中国（天津）'2008IT、网络、信息技术、电子、仪器仪表创新学术会议

作者： Hang-Yu Xiaojin Guo Chen Lanlan (Chongqing University of Posts and Telecommunications 400065)

This paper presents an overview of recent progress in the area of MIMO-OFDM space-time coded wireless *** spatial multiplexing and space-time coding schemes,we highlight the different classes of techniques and algorithms proposed which attempt to realize the various benefits of MIMO-OFDM *** present some backgrounds on the enormous potential of MIMO wireless links,we propose a novel approach of fine frequency synchronization for MIMO-OFDM systems in multi-path *** Likelihood (ML) function of frequency offsets including integral and decimal parts in frequency domain is developed according to the law of great number to eliminate the noise impact of the signal. The proposed function produces a deep trough indicating frequency offset when the timing delay we set in our simulation equal to the actual *** results show that the proposed algorithm gives approach estimation of frequency offset.

关键词： multiple-input-multiple-output (MIMO) Orthogonal Frequency Division Multiplexing(OFDM) space-time coding spatial multiplexing frequency synchronization statistical approximation Maximum Likelihood(ML).

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Towards Improved QoS in 802.16e Mobile WiMAX

Towards Improved QoS in 802.16e Mobile WiMAX

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IEEE Vehicular Technology Conference

作者： Norman C. Beaulieu Young Gil Kim Mohamed Oussama Damen iCORE Wireless Communications Laboratory University of Alberta Department of Electrical and Computer Engineering University of Seoul Department of Electrical & Computer Engineering University of Waterloo

The potential benefits of deploying Matrix C in mobile WiMAX applications are investigated for improving quality of service (QoS). Also, it is shown that Matrix C in the IEEE 802.16e standard is not a Golden code, as ... 详细信息

ISBN: (纸本)9781467318808

关键词： coding Golden code Matrix C QoS space-time coding TAST code WiMAX Quality of service WiMax Mobile Mobile Applications Codes THREADED

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WIDER BANDWIDTHS FOR IMPROVED ANGLE AND VELOCITY RESOLUTION

WIDER BANDWIDTHS FOR IMPROVED ANGLE AND VELOCITY RESOLUTION

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European Signal Processing Conference

作者： Francois LE CHEVALIER Delft University of Technology

Angle and velocity are two primary radar parameters where resolution improvements are mostly needed, for detection of targets in complex environments (e.g. multiple targets, severe and wide-spectrum clutter). In this paper, techniques for improving resolution in velocity and angle through widening of the instantaneous bandwidth are examined, and the possibility of complementing such solutions with high resolution processing is emphasized, with two illustrating examples: wideband MTI (Moving Target Indicator) radar, and multiple transmissions system.

关键词： Radar waveforms Digital Beam Forming space-time coding space-time adaptive processing Waveform diversity MIMO

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Downlink MIMO Diversity with Maximal-Ratio Combining in Heterogeneous Cellular Networks

Downlink MIMO Diversity with Maximal-Ratio Combining in Hete...

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IEEE International Conference on Communications

作者： Ralph Tanbourgi Friedrich K. Jondral Karlsruhe Institute of Technology Communications Engineering Lab

ISBN: (纸本)9781467364300

We present a stochastic model for analyzing the performance of multiple-input multiple-output (MIMO) diversity in a downlink heterogeneous cellular network. Multi-antenna receivers are assumed to perform maximal-ratio combining (MRC). We consider interference-blind (IB) MRC and interference-aware (IA) MRC, where the latter takes the interference power at each antenna into account. Using tools from stochastic geometry, we derive the coverage probability for both types of MRC as a function of various tier-specific system parameters, including the number of base station transmit antennas in each tier. The model is then used to compare the performance of IB-MRC and IA-MRC. One important insight is that IA-MRC becomes less favorable than IB-MRC in a transmit-diversity system due to a larger interference correlation across receive antennas.

关键词： MIMO space-time coding Maximal-ratio combining Coverage probability Poisson point process

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A SINGLE-CARRIER QUASI-ORTHOGONAL TRANSMISSION SCHEME FOR ASYNCHRONOUS COOPERATIVE RELAY NETWORKS

A SINGLE-CARRIER QUASI-ORTHOGONAL TRANSMISSION SCHEME FOR AS...

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European signal processing conference

作者： M.Hayes J.A. Chambers M.D.Macleod Advanced Signal Processing Group Dept. of Electronic and Electrical Engineering Loughborough University LEI 1 3TU UK and *QinetiQ Ltd St. Andrews Rd. Malvern WR14 3PS UK

ISBN: (纸本)9781617388767

A single-carrier quasi-orthogonal distributed block space-time coding scheme for a wireless collaborative network with one relaying stage composed of four nodes is proposed. This block quasi-orthogonal design can attain full diversity and maximum rate, and is based on simple amplify-and-forward processing at the relay nodes. A cyclic prefix is introduced into the block transmission to overcome channel delay mismatches in the paths through the four relays. In single-carrier operation, these delays are shown to introduce inter-symbol-interference (ISI) in the destination signal. A linear pre-processing scheme is therefore designed to mitigate this ISI through maximizing signal-to-interference-plus-noise ratio (SINR) at the receiver in combination with iterative equalization. To reduce the computational complexity of this scheme the underlying interference matrices are rendered sparse by the pre-processing operation. Simulation studies confirm the improvement in SINR of the proposed approach as compared to one which only uses rectangular pre-windowing.

关键词： cooperative systems space-time coding wireless relay networks asynchronous communication Packet transmission relay SINR Asynchronous quasi-orthogonal destination complexity classes

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Performance Analysis of Several Open-Loop Transmit Diversity Schemes for IMT-2000 Systems

Performance Analysis of Several Open-Loop Transmit Diversity...

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2003 International Conference on Communication Technology

作者： Yongquan Qiang Daoben Li BeiJing University of Posts and Telecommunications

space-time transmit diversity, as an effective scheme to mitigate multipath fading, has been proposed for IMT-2000 systems. space-time Transmit Diversity(STTD) has been adopted as an open loop diversi

关键词： space-time coding transmit diversity IMT- 2000

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