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Low-complexity distributed differential spacetime coding scheme for amplify-and-forward cooperative networks

science in china(Series F) 2009年第8期52卷 1418-1427页

作者： yu xiangbin1,2, bi guangguo3 & xu weiye4 1 college of information science and technology, nanjing university of aeronautics and astronautics, nanjing 2.0016, china 2 Department of Electronic Engineering, City university of Hong Kong, Hong Kong, china 3 National Mobile Communications Research Laboratory, Southeast university, nanjing 210096, china 4 Department of Communication Engineering, nanjing Institute of technology, nanjing 211167, china college of information science and technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Department of Electronic Engineering City University of Hong Kong Hong Kong China National Mobile Communications Research Laboratory Southeast University Nanjing 210096 China Department of Communication Engineering Nanjing Institute of Technology Nanjing 211167 China

By introducing a space-time coding scheme based on amicable orthogonality, we develop a distributed differential space-time coding scheme with the amplify-and-forward （AF） method for wireless cooperative networks. The scheme requires no knowledge of the channel state information at both transmitters and receivers, and effectively decreases the realization complexity due to no channel estimation. Moreover, it has lower decoding complexity and higher coding advantage than the existing scheme, thus avoiding the shortcoming of exponential decoding complexity of some existing schemes. According to the pairwise error probability （PEP） analysis of the system, the power allocations of source and relay terminals are jointly optimized, and as a result, the PEP is minimized, which will provide a helpful guideline for system design. Numerical calculation and simulation results show that the developed scheme is superior to the existing scheme. Moreover, the scheme with optimal power allocation yields obvious performance improvement over that with equal power allocation.

关键词： differential space-time coding cooperative communication amplify-and-forward method power allocation

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Performance analysis of variable-power adaptive modulation in space-time block coded MIMO diversity systems

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science china(information sciences) 2010年第10期53卷 2106-2115页

作者： yu xiangbin 1,2 & SHI Huibin 1 1 college of information science and technology, nanjing university of aeronautics and astronautics, nanjing 2.0016, china 2 National Mobile Communications Research Laboratory, Southeast university, nanjing 210096, china 1. college of information science and technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China2. National Mobile Communications Research Laboratory Southeast University Nanjing 210096 China

In this paper, the performance analysis of multi-antenna MIMO systems with variable-power (VP) adaptive modulation and space-time coding is presented. The fading gain value is partitioned into a number of regions by which we decide the transmission power according to the region the fading gain falls in. The optimum fading gain region boundaries (switching thresholds) for maximizing spectrum efficiency (SE) under a target BER and average power constraint are derived. It is shown that the Lagrange multiplier in the constrained SE optimization will be unique if the existence condition for multi-antenna systems is satisfied, and is unique for single antenna systems. A practical iterative calculation method based on Steepest Descent Algorithm for finding the Lagrange multiplier is proposed. With the switching thresholds, the closed-form expressions of the SE and average BER, respectively for VP system and constant-power (CP) system are achieved. Simulation results for SE and average BER are in good agreement with the theory analysis. The results show that VP adaptive modulation with space-time coding provides better SE than the counterpart with CP under a target BER and average power constraint.

关键词： adaptive modulation variable power space-time block code constant power multiple input multiple output (MIMO)

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Power Allocation for SE Maximization in Uplink Massive MIMO System Under Minimum Rate Constraint

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china Communications 2024年第3期21卷 104-117页

作者： Wang Hui yu xiangbin Liu Fuyuan Bai Jiawei college of Electronic and information Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China Key Laboratory of Wireless Sensor Network and Communication Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China

In this paper,we optimize the spectrum efficiency(SE)of uplink massive multiple-input multiple-output(MIMO)system with imperfect channel state information(CSI)over Rayleigh fading *** SE optimization problem is formulated under the constraints of maximum power and minimum rate of each ***,we develop a near-optimal power allocation(PA)scheme by using the successive convex approximation(SCA)method,Lagrange multiplier method,and block coordinate descent(BCD)method,and it can obtain almost the same SE as the benchmark scheme with lower *** this scheme needs three-layer iteration,a suboptimal PA scheme is developed to further reduce the complexity,where the characteristic of massive MIMO(i.e.,numerous receive antennas)is utilized for convex reformulation,and the rate constraint is converted to linear *** suboptimal scheme only needs single-layer iteration,thus has lower complexity than the near-optimal ***,we joint design the pilot power and data power to further improve the performance,and propose an two-stage algorithm to obtain joint *** results verify the effectiveness of the proposed schemes,and superior SE performance is achieved.

关键词： imperfect CSI massive MIMO minimum rate constraint power allocation spectral efficiency

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Power control scheme for multiple antenna systems with space-time coding in Rayleigh fading channels

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Journal of Systems Engineering and Electronics 2011年第5期22卷 730-738页

作者： xiangbin yu guangguo bi college of Electronic and information Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 P. R. China National Mobile Communications Laboratory Southeast University Nanjing 210096 P. R. China

Two optimal power control （PC） schemes under the power constraint for space-time coded multiple input multiple output systems over the flat Rayleigh fading channel with the imperfect channel state information （CSI） are presented. One is based on the minimization of a bit error rate （BER）, and the other is based on the maximization of a fuzzy signal-to-noise ratio. In these schemes, different powers are allocated to individual transmit an- tennas rather than equal power in the conventional one. For the first scheme, the optimal PC procedure is developed. It is shown that the Lagrange multiplier for the constrained optimization in the power control does exist and is unique. A practical iterative algorithm based on Newton＇s method for finding the Lagrange multiplier is proposed. In the second scheme, some existing schemes are included, and a suboptimal PC procedure is developed by means of the asymptotic performance analysis. With this suboptimal scheme, a simple PC calculation formula is provided, and thus the calculation of the PC will be straightforward. Moreover, the suboptimal scheme has the BER performance close to the optimal scheme. Simulation results show that the two PC schemes can provide BER lower than the equal PC and antenna selection scheme under the imperfect CSI.

关键词： power control (PC) space-time coding imperfect channel state information (CSI) bit error rate (BER) signal-to- noise ratio (SNR).

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Performance of multiuser CDMA system with space-time block coding in MIMO Rayleigh fading channels

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science in china(Series F) 2009年第12期52卷 2296-2307页

作者： yu xiangbin DONG Tao bi guangguo college of information science and technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China School of information science and technology Sun Yat-sen University Guangzhou 510275 China National Mobile Communications Research Laboratory Southeast University Nanjing 210096 China

In this paper, by introducing orthogonal space-time coding scheme, the multiuser CDMA systems with different space time codes are given, and corresponding system performance is investigated over Rayleigh fading channel. A low-complexity multiuser receiver scheme is developed for space-time coded CDMA systems. The scheme can make full use of the complex orthogonality of space-time coding to simplify the high decoding complexity of the existing scheme. Compared to the existing scheme with exponential decoding complexity, it has linear decoding complexity. Based on the performance analysis and mathematical calculation, average bit error rate （BER） of the system is derived in detail, and tight closed-form approximation expressions of BER are attained. Simulation results on average BER are in agreement with the theory analysis. The results show that the proposed scheme can achieve almost the same performance as the existing scheme. Moreover, on the condition of same system throughput and concatenation of channel code, the given full-rate space-time coded CDMA system has lower BER than the full-diversity space-time coded CDMA systems.

关键词： space-time block coding code division multiple access (CDMA) full diversity full rate multiple input multiple output (MIMO)

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Performance of orthogonal STBC-MIMO with variable-power adaptive modulation and delayed feedback in Nakagami fading channels

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science china(information sciences) 2013年第10期56卷 81-90页

作者： yu xiangbin CHEN XiaoMin bi guangguo RUI yun college of information science and technology Nanjing University of Aeronautics and Astronautics National Mobile Communications Research Laboratory Southeast University Shanghai Advanced Research Institute Chinese Academic of Science

A variable-power(VP)adaptive modulation(AM)scheme with space-time block code(STBC)is developed in MIMO systems,and the corresponding performance is investigated in Nakagami fading *** optimum switching thresholds are derived so that the spectrum efciency(SE)under an average power and a target bit error rate(BER)constraint is *** the switching thresholds,average BER and SE are further *** a result,closed-form expressions are ***,the exact and approximate BER expressions of VP AM and constant-power(CP)AM systems with delayed feedback are respectively *** results show that the theoretical SE and BER can match the corresponding simulation *** results indicate that VP-AM with STBC provide higher spectrum efciency than the CP counterparts,and has slighter bite error rate performance degradation when the normalized delay is less than 0.01.

关键词： orthogonal space-time coding adaptive modulation variable power delayed feedback Nakagami fading

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Adaptive Energy-Efficient Power Allocation for DAS with Imperfect Channel State information and Antenna Selection

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china Communications 2016年第7期13卷 127-134页

作者： weiye xu Min Lin yu Yang xiangbin yu college of Communications Engineering PLA University of Science and TechnologyNanjingChina information Security Center Beijing University of Posts and TelecommunicationsBeijingChina nanjing university of information science and technology NanjingChina college of Electronic and information Engineering Nanjing University of Aeronautics and AstronauticsNanjingChina School of Communication Engineering Nanjing Institute of TechnologyNanjingChina.

Considering that perfect channel state information(CSI) is difficult to obtain in practice,energy efficiency(EE) for distributed antenna systems(DAS) based on imperfect CSI and antennas selection is investigated in Rayleigh fading channel.A novel EE that is defined as the average transmission rate divided by the total consumed power is *** accordance with this definition,an adaptive power allocation(PA) scheme for DAS is proposed to maximize the EE under the maximum transmit power *** solution of PA in the constrained EE optimization does exist and is unique.A practical iterative algorithm with Newton method is presented to obtain the solution of *** proposed scheme includes the one under perfect CSI as a special case,and it only needs large scale and statistical *** a result,the scheme has low overhead and good *** theoretical EE is also derived for performance evaluation,and simulation result shows the validity of the theoretical ***,EE can be enhanced by decreasing the estimation error and/or path loss exponents.

关键词： distributed antenna system energy efficiency adaptive power allocation imperfect channel state information antenna selection

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Cross-layer Design for Space-time Block Coded MIMO Systems with Imperfect Channel State information

Cross-layer Design for Space-time Block Coded MIMO Systems w...

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2012 IEEE International Conference on Computer science and Automation Engineering（CSAE 2012）

作者： xiangbin yu 1 2 Wenting Tan 1 1 college of Electronic and information Engineering nanjing university of aeronautics and astronautics nanjing china Xin Yin 1 Xiaomin Chen 1 Ying Yang 1 2 National Mobile Communication Research Laboratory Southeast university nanjing china

By combining adaptive modulation （AM） and automatic repeat request （ARQ）, a cross-layer design （CLD） scheme for MIMO system with space-time block coding （STBC） and imperfect channel state information （CSI） is presented in this paper, and the effect of the imperfect CSI on the system performance is investigated. Based on the imperfect CSI, the probability density function of the effective signal to noise ratio （SNR） is derived, and the fading gain switching thresholds subject to a target packet loss rate and fixed power constraint are also derived. According to these results, closed-form expressions of the average spectrum efficiency （SE） and packet error rate （PER） of the system are further derived, respectively. These derived expressions include some existing expressions with perfect CSI as special cases, and can provide good performance evaluation for the CLD system with imperfect CSI. Numerical results verify the validity of the theoretical analysis. The results show that the SE and PER of the system with imperfect CSI are worse than those with perfect CSI due to the estimation error, but their performance difference will be reduced as estimation accuracy increases.

关键词： cross-layer design imperfect CSI spectrum efficiency space-time block coding MIMO packet error rate

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Incremental Multi-Label Learning with Active Queries

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Journal of Computer science & technology 2020年第2期35卷 234-246页

作者： Sheng-Jun Huang Guo-Xiang Li Wen-yu Huang Shao-yuan Li college of Computer science and technology Nanjing University of Aeronautics and AstronauticsNanjing 211106China Key Laboratory of Pattern Analysis and Machine Intelligence Ministry of Industry and Information Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106China Collaborative Innovation Center of Novel Software technology and Industrialization Nanjing University Nanjing 210023China

In multi-label learning,it is rather expensive to label instances since they are simultaneously associated with multiple ***,active learning,which reduces the labeling cost by actively querying the labels of the most valuable data,becomes particularly important for multi-label learning.A good multi-label active learning algorithm usually consists of two crucial elements:a reasonable criterion to evaluate the gain of querying the label for an instance,and an effective classification model,based on whose prediction the criterion can be accurately *** this paper,we first introduce an effective multi-label classification model by combining label ranking with threshold learning,which is incrementally trained to avoid retraining from scratch after every *** on this model,we then propose to exploit both uncertainty and diversity in the instance space as well as the label space,and actively query the instance-label pairs which can improve the classification model *** experiments on 20 datasets demonstrate the superiority of the proposed approach to state-of-the-art methods.

关键词： active learning multi-label learning uncertainty diversity

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Simplified relay antenna selection with source beamforming for MIMO two-way relaying networks

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science china(information sciences) 2017年第2期60卷 141-150页

作者： Jing LI yu ZHENG Jianhua GE Chensi ZHANG xiangbin yu State Key Laboratory of Integrated Service Networks Xidian University college of Electronic and information Engineering Nanjing University of Aeronautics and Astronautics

A simplified relay antenna selection with source beamforming(RAS-BF) scheme is advocated for multiple-input multiple-output(MIMO) two-way relaying networks(TWRNs) employing amplify-and-forward(AF) protocol, which does not require channel estimation at the relay node and the optimal relay antenna can be simply determined by comparing the minimum received pilot signaling powers pertaining to each *** theoretical analysis of system outage probability and average symbol error rate(SER) shows that full diversity order can also be achieved by the simplified scheme. Simulation results are provided to verify our theoretical results and further illustrate that the simplified scheme outperforms the outage-optimal counterpart in the presence of channel state information(CSI) imperfections.

关键词： two-way relaying relay antenna selection beamforming amplify-and-forward diversity

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