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Search Results: 1 - 10 of 27850 matches for " Shaodan Ma "
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The Xinshu 新書 Reexamined: An Emphasis on Usability over Authenticity  [PDF]
Luo Shaodan
Chinese Studies (ChnStd) , 2013, DOI: 10.4236/chnstd.2013.21002
A collection of texts conventionally ascribed to Jia Yi 賈誼 (200-168 BC), the Xinshu 新書 has been subjected to an ages-long debate regarding its authenticity. The present study disclaims the discovery of any adequate evidence to prove the text trustworthy; but it finds the arguments for its forgery ill founded. Rather than present merely an account of this dilemma or attempt to corroborate either position in the debate, this paper argues against the approach in textual criticism that views early texts through a dualistic prism of authenticity vs. forgery. A case of forgery should be established upon no less concrete evidence than should one of authenticity. The mere lack of positive evidence can hardly be regarded or used as any negative evidence to disprove a text. Given the dilemma, the paper suggests treating the Xinshu nonetheless as a workable and even currently reliable source for our study of Jia Yi until that very day dawns upon us with any unequivocal evidence of its forgery detected or, better still, excavated.
Information Literacy in Chinese Studies  [PDF]
Luo Shaodan
Chinese Studies (ChnStd) , 2014, DOI: 10.4236/chnstd.2014.32008
Abstract: The present essay proposes a dual stratification of information literacy (IL). Information search in academia generally takes place in specific subject areas. While recognizing the importance of basic IL in one’s search for information, the essay observes that the search cannot be complete without the awareness of what information to seek in that particular subject field as well as the ability to locate and evaluate information in the field. Each subject area may need to have its own definition of IL. Such IL in a given area may largely overlap with, and yet significantly differ from, the general IL that is, to quote the definition by ALA (American Library Association), “common to all disciplines.” The essay uses the field of Chinese studies to illustrate the point and, accordingly, suggests ways of IL instruction that is suitable to Chinese studies.
Matrix-Monotonic Optimization for MIMO Systems
Chengwen Xing,Shaodan Ma,Yiqing Zhou
Computer Science , 2013,
Abstract: For MIMO systems, due to the deployment of multiple antennas at both the transmitter and the receiver, the design variables e.g., precoders, equalizers, training sequences, etc. are usually matrices. It is well known that matrix operations are usually more complicated compared to their vector counterparts. In order to overcome the high complexity resulting from matrix variables, in this paper we investigate a class of elegant multi-objective optimization problems, namely matrix-monotonic optimization problems (MMOPs). In our work, various representative MIMO optimization problems are unified into a framework of matrix-monotonic optimization, which includes linear transceiver design, nonlinear transceiver design, training sequence design, radar waveform optimization, the corresponding robust design and so on as its special cases. Then exploiting the framework of matrix-monotonic optimization the optimal structures of the considered matrix variables can be derived first. Based on the optimal structure, the matrix-variate optimization problems can be greatly simplified into the ones with only vector variables. In particular, the dimension of the new vector variable is equal to the minimum number of columns and rows of the original matrix variable. Finally, we also extend our work to some more general cases with multiple matrix variables.
Performance Analysis for Heterogeneous Cellular Systems with Range Expansion
Haichuan Ding,Shaodan Ma,Chengwen Xing,Zesong Fei,Jingming Kuang
Mathematics , 2012,
Abstract: Recently heterogeneous base station structure has been adopted in cellular systems to enhance system throughput and coverage. In this paper, the uplink coverage probability for the heterogeneous cellular systems is analyzed and derived in closed-form. The randomness on the locations and number of mobile users is taken into account in the analysis. Based on the analytical results, the impacts of various system parameters on the uplink performance are investigated in detail. The correctness of the analytical results is also verified by simulation results. These analytical results can thus serve as a guidance for system design without the need of time consuming simulations.
A Matrix-Field Weighted Mean-Square-Error Model for MIMO Transceiver Designs
Chengwen Xing,Wenzhi Li,Shaodan Ma,Zesong Fei,Jingming Kuang
Mathematics , 2013,
Abstract: In this letter, we investigate an important and famous issue, namely weighted mean-square-error (MSE) minimization transceiver designs. In our work, for transceiver designs a novel weighted MSE model is proposed, which is defined as a linear matrix function with respect to the traditional data detection MSE matrix. The new model can be interpreted an extension of weighting operation from vector field to matrix field. Based on the proposed weighting operation a general transceiver design is proposed, which aims at minimizing an increasing matrix-monotone function of the output of the previous linear matrix function. The structure of the optimal solutions is also derived. Furthermore, two important special cases of the matrix-monotone functions are discussed in detail. It is also revealed that these two problems are exactly equivalent to the transceiver designs of sum MSE minimization and capacity maximization for dual-hop amplify-and-forward (AF) MIMO relaying systems, respectively. Finally, it is concluded that the AF relaying is undoubtedly this kind of weighting operation.
Cooperative Beamforming for Dual-Hop Amplify-and-Forward Multi-Antenna Relaying Cellular Networks
Chengwen Xing,Minghua Xia,shaodan Ma,Yik-Chung Wu
Mathematics , 2011,
Abstract: In this paper, linear beamforming design for amplify-and-forward relaying cellular networks is considered, in which base station, relay station and mobile terminals are all equipped with multiple antennas. The design is based on minimum mean-square-error criterion, and both uplink and downlink scenarios are considered. It is found that the downlink and uplink beamforming design problems are in the same form, and iterative algorithms with the same structure can be used to solve the design problems. For the specific cases of fully loaded or overloaded uplink systems, a novel algorithm is derived and its relationships with several existing beamforming design algorithms for conventional MIMO or multiuser systems are revealed. Simulation results are presented to demonstrate the performance advantage of the proposed design algorithms.
Rate Selection for Cooperative HARQ-CC Systems over Time-Correlated Nakagami-m Fading Channels
Zheng Shi,Shaodan Ma,Kam-Weng Tam
Mathematics , 2015,
Abstract: This paper addresses the problem of rate selection for the cooperative hybrid automatic repeat request with chase combination (HARQ-CC) system, where time correlated Nakagami-m fading channels are considered. To deal with this problem, the closed-form cumulative distribution function (CDF) for the combine SNRs through maximal ratio combining (MRC) is first derived as a generalized Fox's $\bar H$ function. By using this result, outage probability and delay-limited throughput (DLT) are derived in closed forms, which then enables the rate selection for maximum DLT. These analytical results are validated via Monte Carlo simulations. The impacts of time correlation and channel fading-order parameter $m$ upon outage probability, DLT and the optimal rate are investigated thoroughly. It is found that the system can achieve more diversity gain from less correlated channels, and the outage probability of cooperative HARQ-CC system decreases with the increase of $m$, and etc. Furthermore, the optimal rate increases with the number of retransmissions, while it decreases with the increase of the channel time correlation.
A Unified Linear MSE Minimization MIMO Beamforming Design Based on Quadratic Matrix Programming
Chengwen Xing,Zesong Fei,Shaodan Ma,Jingming Kuang,Yik-Chung Wu
Mathematics , 2012,
Abstract: In this paper, we investigate a unified linear transceiver design with mean-square-error (MSE) as the objective function for a wide range of wireless systems. The unified design is based on an elegant mathematical programming technology namely quadratic matrix programming (QMP). It is revealed that for different wireless systems such as multi-cell coordination systems, multi-user MIMO systems, MIMO cognitive radio systems, amplify-and-forward MIMO relaying systems, the MSE minimization beamforming design problems can always be solved by solving a number of QMP problems. A comprehensive framework on how to solve QMP problems is also given.
A General Robust Linear Transceiver Design for Multi-Hop Amplify-and-Forward MIMO Relaying Systems
Chengwen Xing,Shaodan Ma,Zesong Fei,Yik-Chung Wu,H. Vincent Poor
Mathematics , 2011,
Abstract: In this paper, linear transceiver design for multi-hop amplify-and-forward (AF) multiple-input multiple-out (MIMO) relaying systems with Gaussian distributed channel estimation errors is investigated. Commonly used transceiver design criteria including weighted mean-square-error (MSE) minimization, capacity maximization, worst-MSE/MAX-MSE minimization and weighted sum-rate maximization, are considered and unified into a single matrix-variate optimization problem. A general robust design algorithm is proposed to solve the unified problem. Specifically, by exploiting majorization theory and properties of matrix-variate functions, the optimal structure of the robust transceiver is derived when either the covariance matrix of channel estimation errors seen from the transmitter side or the corresponding covariance matrix seen from the receiver side is proportional to an identity matrix. Based on the optimal structure, the original transceiver design problems are reduced to much simpler problems with only scalar variables whose solutions are readily obtained by iterative water-filling algorithm. A number of existing transceiver design algorithms are found to be special cases of the proposed solution. The differences between our work and the existing related work are also discussed in detail. The performance advantages of the proposed robust designs are demonstrated by simulation results.
Robust Beamforming for Amplify-and-Forward MIMO Relay Systems Based on Quadratic Matrix Programming
Chengwen Xing,Shaodan Ma,Yik-Chung Wu,Tung-Sang Ng
Mathematics , 2010,
Abstract: In this paper, robust transceiver design based on minimum-mean-square-error (MMSE) criterion for dual-hop amplify-and-forward MIMO relay systems is investigated. The channel estimation errors are modeled as Gaussian random variables, and then the effect are incorporated into the robust transceiver based on the Bayesian framework. An iterative algorithm is proposed to jointly design the precoder at the source, the forward matrix at the relay and the equalizer at the destination, and the joint design problem can be efficiently solved by quadratic matrix programming (QMP).
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