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16th IEEE International Conference on Communication Systems (IEEE ICCS)

作者： Adachi, Fumiyuki Bookajay, Amnart Saito, Tomoyuki Seki, Yuta Tohoku Univ ROEC Aoba Ku 2-1-1 Katahira Sendai Miyagi 9808577 Japan

ISBN: (纸本)9781538678640

Although multi-user MIMO multiplexing is known as a powerful means to increase the sum throughput, MIMO diversity still remains as an important means to improve the bit error rate (BER) performance in a poor channel condition. Recently, we proposed selective MIMO diversity with subcarrierwise user equipment (UE) antenna identification/selection. Selective MIMO diversity jointly uses maximal-ratio transmit diversity & frequency-domain equalization (MRTD-FDE) and minimum mean square error combining diversity & FDE (MMSECD-FDE) both at base station (BS) for OFDM downlink and SC uplink, respectively. In this paper, we compare selective MIMO diversity with two other typical MIMO diversity schemes, i.e., the space-time block-coded (STBC) diversity and the MMSE filtering combined with singular value decomposition (MMSESVD) based diversity. Pilot-aided channel estimation (PACE) is used for generating the transmit/receive diversity & equalization weights at BS and the transmit/receive diversity weights at UE. The uncoded average BER performance of selective MIMO diversity in a frequency-selective Rayleigh fading MIMO channel is evaluated by computer simulation and is compared with those of STBC-TD and MMSE-SVD diversity.

关键词： MIMO diversity frequency-domain equalization MIMO channel estimation space-time block coding

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Performance Analysis of STBC-FSO Communication System in Different Turbulence Regimes

Performance Analysis of STBC-FSO Communication System in Dif...

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International Conference on Communication, Devices and Networking (ICCDN)

作者： Garg, Sonali Dixit, Abhishek Jain, Virander Kumar IIT Delhi Dept Elect Engn New Delhi 110075 India

ISBN: (纸本)9789811079016;9789811079009

The major concern in free-space optical communication is atmospheric turbulence which may significantly degrade the performance depending upon the level of turbulence. The use of spatial time diversity can mitigate the effects of fading caused by atmospheric turbulence. The simulation results show the application of space-time block coding in intensity modulation and direct detection system to improve the bit error rate performance. The improvement in terms of coding gain is maximum when the turbulence level is high.

关键词： Free-space optical communications space-time block coding Lognormal Negative exponential Gamma-gamma

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space-time block coding for Doubly-Selective Channels

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2010年第3期58卷 1934-1940页

作者： Fang, Kun Leus, Geert Delft Univ Technol Fac Elect Engn Math & Comp Sci NL-2628 CD Delft Netherlands

In this paper, we present a new spacetime block code for time-and frequency-selective (doubly-selective) channels. It can be interpreted as the extension of the Alamouti code to doubly-selective channels, and relies on a joint time frequency reversal of the transmitted sequences. Under certain channel conditions, the proposed spacetime block code belongs to the class that achieves full spatial, delay, and Doppler diversity using a maximum-likelihood (ML) receiver, as well as a linear zero-forcing (LZF) or linear minimum mean-squared error (LMMSE) receiver. For realistic doubly-selective channels, a real-valued linear data model is presented, for which different receiver structures can be developed.

关键词： Delay diversity Doppler diversity doubly-selective channels space-time block coding

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Modular Transmitter and Receiver for space-time coding 11

Modular Transmitter and Receiver for Space-Time Coding

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11th European Conference on Antennas and Propagation (EUCAP)

作者： Van den Brande, Quinten Van Torre, Patrick Verhaevert, Jo Vanfleteren, Jan Rogier, Hendrik Univ Ghent iMinds Dept Informat Technol Technol Pk Zwijnaarde 15 B-9052 Ghent Belgium Univ Ghent CMST Dept Elect & Informat Syst Technol Pk Zwijnaarde 15 B-9052 Ghent Belgium

ISBN: (纸本)9788890701870

In this article a Multiple Input Single Output (MISO) hardware design is reported, comprising both a transmitter and a receiver for space-time coded signals. The transmitter implements Alamouti space-time coding, while the receiver uses maximum likelihood estimation to decode the space-time codes. As a result, the hardware communication system is configured as a 2x1 MISO link. The hardware is designed modularly, in order for the system to be easily extendible for the connection of multiple antennas. A digital core allows high-speed data generation in the signal generator units, forwarding analog I and Q signals to the radio-frequency modules connected to it. The Bit Error Rate (BER) performance of the Alamouti diversity scheme is compared to the performance of Single Input Single Output (SISO) and Maximum Ratio Combining (MRC) systems. This comparison is based on simulation results, providing a good approximation of the theoretical BER performance, and a series of hardware measurements to empirically support this theoretical performance.

关键词： RF circuit design space-time block coding Alamouti diversity Bit Error Rate Multiple Input Multiple Output

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Cooperative Distributed Antenna Transmissions 85

Cooperative Distributed Antenna Transmissions

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IEEE 85th Vehicular Technology Conference (VTC Spring)

作者： Adachi, Fumiyuki Boonkajay, Amnart Seki, Yuta Saito, Tomoyuki Tohoku Univ ROEC Aoba Ku 2-1-1 Katahira Sendai Miyagi 9808577 Japan

ISBN: (纸本)9781509059324

Distributed antenna small-cell network is a promising 5G network. In this paper, a comprehensive report of recent advance in the cooperative distributed antenna transmission (CDAT) is provided. Single-user space-time block coded transmit diversity (STBC-TD) and multi-user minimum mean square error filtering combined with singular value decomposition (MMSE-SVD) are presented. Also presented is blind selected mapping (blind SLM) which can suppress the peak-to-average signal power ratio (PAPR) and requires no side information transmission. The effectiveness of CDAT in the presence of co-channel interference (CCI) from adjacent macro-cells is confirmed by computer simulation.

关键词： 5G mobile communications distributed antenna small-cell network space-time block coding multi-user spatial multiplexing selected mapping

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space time block Coded Spatial Modulation for Free space Optical Communication

Space Time Block Coded Spatial Modulation for Free Space Opt...

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5th IEEE International Black Sea Conference on Communications and Networking (IEEE BlackSeaCom)

作者： Fettahoglu, Ferhat Odabasioglu, Niyazi Istanbul Univ Dept Elect & Elect Engn TR-34320 Istanbul Turkey

ISBN: (纸本)9781509050499

Spatial modulation (SM) is a promising technique for improving spectral efficiency for both radio frequency (RE) and optical wireless communication (OWC) systems. space-time block coding (STBC) scheme is another important technique to enhance the system performance of RE and OWC. Recently, STBC and SM techniques are combined for RF systems to take advantages of both systems while avoiding their drawbacks. In this paper, we propose space-time block coded spatial modulation (STBC-SM) for free space optical communication (FSO). We derived the analytical bit-error rate (BER) expression of the proposed system for log-normal and gamma-gamma atmospheric turbulence channels where the pulse amplitude modulation (PAM) is considered for Intensity Modulation (IM) with Direct Detection (1)1)). We confirm the accuracy of our analytical expression through computer simulations. Additionally, we compare our proposed optical STBC-SM scheme with the optical SM scheme in terms of BER performance.

关键词： Modulation Multiplexing Optical Communication space-time block coding

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A Quaternion-Based Approach to Interference Alignment with Alamouti coding 17

A Quaternion-Based Approach to Interference Alignment with A...

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17th IEEE International Symposium on Signal Processing and Information Technology (ISSPIT)

作者： Fanjul, J. Santamaria, I. Loucera, C. Univ Cantabria Dept Ingn Comunicac DICOM Plaza Ciencia E-39005 Santander Spain

ISBN: (纸本)9781538646625

Based on the representation of Alamouti space-time codewords as quaternions, this paper proposes a scheme that combines interference alignment (IA) with Alamouti signals. The proposed formulation allows for a separation of the space-time block coding (to gain spatial diversity) and the IA precoding (to reduce or ideally suppress interference). Although this separation is not necessarily optimal, the splitting of alignment precoding and Alamouti encoding is particularly convenient because it enables the independent optimization of the IA solution using quaternionic versions of standard alternating optimization techniques such as the maximum signal-to-interference-plus-noise algorithm. Some numerical simulations are included to compare the performance of the proposed quaternion IA+Alamouti algorithm with standard IA algorithms in the complex domain as well as with interference cancellation schemes at the receiver side.

关键词： Interference alignment MIMO interference channel space-time block coding Alamouti quaternions

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Performance Enhancement of Multiuser Passive time Reversal Communication Based on space-time block coding

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China Ocean Engineering 2010年第1期24卷 173-182页

作者：宫改云姚文斌潘翔宫先仪 Department of Information Science and Electronic Engineering Zhejiang University Institute of Applied Mathematics and Engineering Calculation Hangzhou Dianzi University Logistic Technology School Zhejiang Technology Institute of Economy

Reliable, with high data rate, acoustic communication in time-valTing, multipath shallow water environment is a hot research topic recently. Passive time reversal communication has shown promising results in improvement of the system performance. In multiuser environment, the system performance is significantly degraded due to the interference among different users. Passive time reversal can reduce such interference by minimizing the cross-correlated version of channel impulse response among users, which can be realized by the well-separated users in depth. But this method also has its shortcomings, even with the absence of relative motion, the minimization sometimes may be impossible because of the time-varying environment. Therefore in order to avoid the limitation of minimizing the cross-correlated channel function, an approach of passive time reversal based on space-time block coding （STBC） is presented in this paper. In addition, a single channel equalizer is used as a pest processing technique to reduce the residual symbol interference. Experimental results at 13 kHz with 2 kHz bandwidth demonstrate that this method has better performance to decrease bit error rate and improve signal to noise ratio, compared with passive time reversal alone or passive time reversal combined with equalization.

关键词： multiuser passive time reversal space-time block coding equalization

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Cooperative Distributed Antenna Transmission for 5G Mobile Communications Network

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IEICE TRANSACTIONS ON COMMUNICATIONS 2017年第8期E100B卷 1190-1204页

作者： Adachi, Fumiyuki Boonkajay, Amnart Seki, Yuta Saito, Tomoyuki Kumagai, Shinya Miyazaki, Hiroyuki Tohoku Univ Sendai Miyagi 9808579 Japan Tohoku Univ Res Org Elect Commun Sendai Miyagi 9808579 Japan

In this paper, the recent advances in cooperative distributed antenna transmission (CDAT) are introduced for spatial diversity and multi-user spatial multiplexing in 5G mobile communications network. CDAT is an advanced version of the coordinated multi-point (CoMP) transmission. space-time block coded transmit diversity (STBC-TD) for spatial diversity and minimum mean square error filtering combined with singular value decomposition (MMSE-SVD) for multi-user spatial multiplexing are described under the presence of co-channel interference from adjacent macro-cells. Blind selected mapping (blind SLM) which requires no side information transmission is introduced in order to suppress the increased peak-to-average signal power ratio (PAPR) of the transmit signals when CDAT is applied. Some computer simulation results are presented to confirm the effectiveness of CDAT techniques.

关键词： 5G mobile communications network distributed antenna network cooperative signal transmission space-time block coding multi-user communication signal peak suppression

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Fast Convergent LMS Adaptive Receiver for MC-CDMA Systems with space-time block coding

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IEEE COMMUNICATIONS LETTERS 2010年第8期14卷 737-739页

作者： Seo, Bangwon Ahn, Woo-Geun Jeong, Cheol Kim, Hyung-Myung Elect & Telecommun Res Inst Taejon 305606 South Korea Korea Adv Inst Sci & Technol Dept Elect Engn Taejon 305701 South Korea

For multicarrier code-division multiple access (MC-CDMA) systems employing Alamouti's simple space-time block coding (STBC), a special relationship between two minimum mean-square error (MMSE) filter weight vectors is derived in which one filter is for detecting odd-indexed symbols and the other for even-indexed symbols. Using this relationship, a modified MSE cost function is presented and an improved least mean-square (LMS) adaptive receiver is proposed. Since the number of filter taps independently updated in the proposed adaptive receiver is only half that of the conventional LMS adaptive receiver, the proposed adaptive receiver has a faster convergence rate than the conventional LMS adaptive receiver while keeping the same steady-state MSE performance. This is verified through the simulation.

关键词： MC-CDMA space-time block coding MMSE receiver LMS adaptive receiver

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