In this paper, a joint precoding and decoding design scheme is proposed for two-way Multiple-Input Multiple-Output (MIMO) multiple-relay system. The precoding and decoding matrices are jointly optimized based on Minim...
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In this paper, a joint precoding and decoding design scheme is proposed for two-way Multiple-Input Multiple-Output (MIMO) multiple-relay system. The precoding and decoding matrices are jointly optimized based on Minimum Mean-Square-Error (MMSE) criteria under transmit power constraints. The optimization problem is solved by using a convergent iterative algorithm which in-cludes four sub-problems. It is shown that due to the difficulty of the block diagonal nature of the relay precoding matrix, sub-problem two cannot be solved with existing methods. It is then solved by converting sub-problem two into a convex optimization problem and a simplified method is proposed to reduce the computational complexity. Simulation results show that the proposed scheme can achieve lower Bit Error Rate (BER) and larger sum rate than other schemes. Furthermore, the BER and the sum rate performance can be improved by increasing the number of antennas for the same number of relays or increasing the number of relays for the same number of antennas.
This paper investigates the robust H control problem of spacecraft rendezvous on elliptical *** on Lyapunov theory,a sufficient condition for the existence of the robust Hcontroller is given in terms of the periodic R...
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ISBN:
(纸本)9781479900305
This paper investigates the robust H control problem of spacecraft rendezvous on elliptical *** on Lyapunov theory,a sufficient condition for the existence of the robust Hcontroller is given in terms of the periodic Riccati differential equation（PRDE） with an indefinite quadratic ***,an approximate stabilizable controller is designed by using an iterative *** the controller obtained,the spacecraft rendezvous mission can be *** illustrative example is provided to show the effectiveness of the proposed control design method.
Interference alignment (IA) is a powerful scheme that has emerged out of recent work in the context of the MIMO X channel. Most of the existing IA schemes are aimed to optimize the sum-capacity, the error probability,...
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ISBN:
(纸本)9781467360791;9781467360777
Interference alignment (IA) is a powerful scheme that has emerged out of recent work in the context of the MIMO X channel. Most of the existing IA schemes are aimed to optimize the sum-capacity, the error probability, and the mean square errors (MSE) of the system, and less consider the system power efficiency. This paper proposes a new IA scheme to minimize the system transmit power under the condition of every user's MSE constraint through a joint design of linear transmitter and receiver for a K-user MIMO interference system. In order to solve our optimization problem, we employ the Lagrange function and Karush-Kuhn-Tucker (KKT) conditions, then get the transmitter precoding and receiving filter matrices expressions by the analysis and derivation. Finally, we use a joint iterative algorithm to solve the proposed optimization problem. Simulation results verify that the provided scheme improves the power efficiency.
A corner detection method is addressed in this paper. It is designed in order to construct a feature-based map which is applied to the simultaneous localization and mapping problem of mobile robots. With a iterative l...
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ISBN:
(纸本)9781728113128
A corner detection method is addressed in this paper. It is designed in order to construct a feature-based map which is applied to the simultaneous localization and mapping problem of mobile robots. With a iterative line segments extraction algorithm, the corner detection method has low time complexity and high accuracy. Results of experiment illustrate the effectiveness of the designed corner detection method.
The paper presents a novel algorithm for multiple space vehicles positioning. The algorithm first positions the ground stations using multiple space vehicles with initial coordinates, then calculates the differences o...
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ISBN:
(纸本)0878492712
The paper presents a novel algorithm for multiple space vehicles positioning. The algorithm first positions the ground stations using multiple space vehicles with initial coordinates, then calculates the differences of the ground stations position results and their real coordinates, at last uses the differences to estimate the revised error for space vehicles' coordinates. It can use iterative method to achieve needed precision of the SV's coordinates. At last, simulation results prove the stability and credibility of the algorithm in space vehicles positioning.
To solve the electrical capacitance tomography(ECT) technology "soft field" effect and pathological problem, a Quasi-Newton new algorithm for electrical capacitance tomography is presented. On the basis of a...
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ISBN:
(纸本)9781424442461
To solve the electrical capacitance tomography(ECT) technology "soft field" effect and pathological problem, a Quasi-Newton new algorithm for electrical capacitance tomography is presented. On the basis of analyzing ECT system measurement principle, constructing corrector formula of secant approximation algorithm in second-order information items of objective functions. The feasibility of using this algorithm for ECT problems is also discussed. It shows that it is easy to meet the convergence condition and error of image reconstruction is small. Experimental results and simulation data indicate that the algorithm can provide high quality images and favorable stabilization compared with LBP and conjugate gradient algorithms and this new algorithm presents a feasible and effective way to research on image reconstruction algorithm for Electrical Capacitance Tomography System.
Recently, we proposed approximate least squares (ALS), a low complexity approach to solve the linear least squares problem. In this work we present the step-adaptive linear least squares (SALS) algorithm, an extension...
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ISBN:
(纸本)9780992862633
Recently, we proposed approximate least squares (ALS), a low complexity approach to solve the linear least squares problem. In this work we present the step-adaptive linear least squares (SALS) algorithm, an extension of the ALS approach that significantly reduces its approximation error. We theoretically motivate the extension of the algorithm, and introduce a low complexity implementation scheme. Our performance simulations exhibit that SALS features a practically negligible error compared to the exact LS solution that is achieved with only a marginal complexity increase compared to ALS. This performance gain is achieved with about the same low computational complexity as the original ALS approach.
Compared with image method (IM) based ray tracing (RT), shooting and bouncing ray (SBR) method is characterized by fast speed but low accuracy. In this paper, an iterative precise algorithm based on equiangular divisi...
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ISBN:
(纸本)9781665454681
Compared with image method (IM) based ray tracing (RT), shooting and bouncing ray (SBR) method is characterized by fast speed but low accuracy. In this paper, an iterative precise algorithm based on equiangular division is proposed to make rough paths accurate, allowing SBR to calculate exact channel information. Different ray launching methods are compared to obtain a better launching method. By using equiangular division, rays are launched more uniformly from transmitter (Tx) compared with the current equidistant division method. With the proposed iterative precise algorithm, error of angle of departure (AOD) and angle of arrival (AOA) is below 0.01 degrees. The relationship between the number of iterations and error reduction is also given. It is illustrated that the proposed method has the same accuracy as IM by comparing the power delay profile (PDP) and angle distribution of paths. This can solve the problem of low accuracy brought by SBR.
This paper considers reset control systems with output uncertainties. We present sufficient conditions for the quadratic stability and finite L-2 gain stability. Then, the results are extended to piecewise quadratic s...
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ISBN:
(纸本)9789881563842
This paper considers reset control systems with output uncertainties. We present sufficient conditions for the quadratic stability and finite L-2 gain stability. Then, the results are extended to piecewise quadratic stability which is much less conservative. Moreover, an iterative algorithm is proposed to design the reset controller. All the obtained results are given as linear matrix inequalities (LMIs) that can be solved effectively. Numerical examples are given to illustrate the results.
iterative algorithms for finding two-sided approximations to the eigenvalues of nonlinear algebraic eigenvalue problems are examined. These algorithms use an efficient numerical procedure for calculating the first and...
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