共查询到20条相似文献,搜索用时 31 毫秒
1.
A current-mode instrumentation amplifier consists of only two current follower differential input transconductance amplifiers is proposed in this paper. The proposed circuit of instrumentation amplifier is realized without using any passive components. Thus, the proposed circuit structure is very simple and suitable to the integrated circuit technology. The input impedance is low and output impedance is high, therefore the proposed circuit is easily cascadable. The gain of the proposed instrumentation amplifier is electronically controllable. The proposed circuit also enjoys the features of high common mode rejection ratio, wide bandwidth and low power consumption. Additionally, performance of the proposed circuit is tested under process, supply voltage and temperature variations. Furthermore, another circuit of instrumentation amplifier, which is capable of providing higher differential mode gain is also shown. The non-ideal and parasitic studies are included. HSPICE simulations are performed to validate the proposed circuits of instrumentation amplifier. 相似文献
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A new adaptive MIMO channel equalizer is proposed based on adaptive generalized decision-feedback equalization and ordered-successive interference cancellation. The proposed equalizer comprises equal-length subequalizers, enabling any adaptive filtering algorithm to be employed for coefficient updates. A recently proposed computationally efficient recursive least squares algorithm based on dichotomous coordinate descents is utilized to solve the normal equations associated with the adaptation of the new equalizer. Convergence of the proposed algorithm is examined analytically and simulations show that the proposed equalizer is superior to the previously proposed adaptive MIMO channel equalizers by providing both enhanced bit error rate performance and reduced computational complexity. Furthermore, the proposed algorithm exhibits stable numerical behavior and can deliver a trade-off between performance and complexity. 相似文献
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该文基于块对角化的思想提出了一种次最优用户选择方案。首先推导出一个和速率容量的上界公式,将其作为该文提出算法的选择准则;然后用此上界公式代替瞬时和容量公式作为自适应准则,得到了所提出算法的简化算法;最后考虑到用户之间服务公平性的因素,把该文的提出算法与比例公平调度机制相结合,使得系统既能获得一定的信道容量增益又能让所有用户均得到公平的服务。仿真结果表明,该文所提出算法具有接近最优的性能,与比例公平调度机制相结合后可以达到系统和容量与服务公平性的折衷。 相似文献
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The paper proposes a method for enhancing the accuracy of estimation of frequency offset for OFDM modulation based communication systems. An increase accuracy of the proposed method is achieved at the expense of combined use of pilot and information symbols of OFDM signal. The main factors determining the accuracy of proposed method were identified. Mathematical simulation of the proposed method was performed for a multipath radio wave propagation channel. The proposed method efficiency was shown in comparison with existing methods for the estimation of frequency offset. Advantages and disadvantages of existing and proposed methods were described. The relationships of the root-mean-square error of frequency offset estimation as a function of the signal-to-noise ratio were built for the proposed and existing methods. The attainable high accuracy of frequency offset estimation by employing the proposed method makes its use expedient in control and measuring equipment. Conclusions have been made regarding the simulation results obtained and the expediency of proposed method applications. 相似文献
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A new efficient identity-based message authentication scheme for VANET was proposed. The proposed scheme decreased the complexity of cryptographic operations on signature by using elliptic curve cryptosystem (ECC) to construct authentication protocol without bilinear pairing and provided the function of conditional privacy-preserving. Security analysis demonstrated that the proposed scheme satisfies all security and privacy requirements for VANET. Per-formance analysis show that compared with the most recent proposed schemes the proposed scheme decreases the com-putation cost and communication cost. 相似文献
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该文把Asharif(1999)定义的相关函数均方误差(MSE)准则Jr(n)=E「eT(n)Ce(n)」改为时变的遗忘因子指数加权最小二乘误差(LSE)准则Jr(n)=nt=0 n-teT(n)Ce(n),对这一准则利用梯度法,使当前时刻的梯度向量正交于前一时刻的梯度向量而得到一种新的相关函数自适应滤波算法.计算机仿真结果表明新算法的收敛性能优于Asharif提出的ECLMS算法. 相似文献
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A simple snubber configuration for three-level GTO inverters 总被引:1,自引:0,他引:1
Jeong-Hyoun Sung Kwanghee Nam 《Power Electronics, IEEE Transactions on》1999,14(2):246-257
A simple snubber configuration for three-level gate turn-off thyristor (GTO) inverters is proposed. The proposed snubber has a single resistor per arm for stored energy dissipation, while the conventional RLD/RCD snubber contains six. This implies that the proposed snubber needs only one chopper circuit per arm for snubber energy recovery. This helps reduce the size, cost, and number of components. Besides the single resistor, the proposed snubber requires two less diodes per arm than the RLD/RCD snubber. Furthermore, the proposed snubber resolves the voltage imbalance problem between inner and outer GTOs without additional components. We have analyzed the proposed circuits and proven its performance through simulations and experiments 相似文献
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Two novel L1 estimation methods for multisensor data fusion are developed, respectively in the case of known and unknown scaling coefficients. Two discrete-time cooperative learning (CL) algorithms are proposed to implement the two proposed methods. Compared with the high-order statistical method and the entropy estimation method, the two proposed estimation methods can minimize a convex cost function of the linearly fused information. Furthermore, the proposed estimation method can be effectively used in the blind fusion case. Compared with the minimum variance estimation method and linearly constrained least square estimation method, the two proposed estimation methods are suitable for non-Gaussian noise environments. The two proposed CL algorithms are guaranteed to converge globally to the optimal fusion solution under a fixed step length. Unlike existing CL algorithms, the proposed two CL algorithms can solve a more complex L1 estimation problem and are more suitable for weight learning. Illustrative examples show that the proposed CL algorithms can obtain more accurate solutions than several related algorithms. 相似文献
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与之前的编码标准相比,多功能视频编码(versatile video coding,VVC)进一步提高了压缩效率。嵌套多类树的四叉树(quadtree with nested multi-type tree,QTMT)结构是提高编码增益的关键之一,同时极大地增加了编码复杂度。为降低VVC编码复杂度,提出了一种基于深度学习的快速QTMT划分方法。首先,提出了注意力?非对称卷积结构来预测划分模式的概率。然后,基于阈值提出了快速划分模式决策。最后,提出了编码性能与时间的代价函数来求解最优阈值,提出了阈值决策方法。实验表明,算法在不同档次下的时间节省分别为48.62%、52.93%、62.01%,BDBR分别为1.05%、1.33%、2.38%。结果表明,算法的时间节省和率失真性能优于其他快速算法。 相似文献
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A Simplified Control Method for the Grid-Connected Inverter With the Function of Islanding Detection
《Power Electronics, IEEE Transactions on》2008,23(6):2775-2783
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Comparing to the traditional data collecting method with data route,the technology of wireless mobile nodes has gradually became a new technique in the wireless sensor network.As the solution to the visiting order of the static nodes was an intrinsic NP-hard problem,a more general multi-objective data colleting strategies based on multi-mobile nodes was proposed.The proposed data collecting technique was abstracted as a model of time variable multiple traveling salesman problem.Belonging to a discrete optimal problem,the proposed model was solved by with a proposed hybrid genetic algorithm to determine the paths of the multi-mobile nodes.The convergence analysis of the proposed algorithm was given.With the experiment of open dataset,the proposed model based on the time variable multiple traveling salesman problem and the proposed hybrid genetic algorithm certify a certain improvement to the efficiency and real-time ability. 相似文献
16.
Fatemeh Masoudinia Mehran Sabahi Hasan Alipour 《International Journal of Electronics》2020,107(7):1177-1194
ABSTRACT In this paper, a new cascade multilevel inverter based on series connection of several basic units is proposed. The basic topology consists of 5 dc voltage sources and 12 switches. The required mathematical analysis consisting of voltage on switches, power losses and the values of dc voltage sources is provided. To verify the advantages of proposed topology, the suggested structure is compared with other multilevel inverter topologies in terms of used dc voltage sources, switches, voltage on switches and the number of on-state switches. The proposed structure uses the least numbers of dc voltage sources and switches compared to other multilevel inverters for the same number of levels. Also, voltage rating on the switches in the proposed topology is less than other topologies. These characteristics cause the weight, size and cost of proposed topology to be reduced. The proposed inverter is implemented using experimental setup. The experimental results verify the performance of proposed structure. 相似文献
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A new bidirectional switch and snubber circuit are proposed for medium-voltage AC/AC converters. The proposed switch can be constructed using 2-in-1 insulated-gate bipolar transistor and 2-in-1 diode modules, and can reduce the voltage stress of the switching device by series connection. The proposed snubber configuration is very simple and can regenerate absorbed energy. On the other hand, timing errors in the switching between the series-connected switches cause a voltage imbalance in the snubber circuit. Therefore, a simple method is proposed for reducing the voltage imbalance that uses one voltage sensor for each switch circuit. This proposed method controls the snubber voltages by adjusting the switch timings. Furthermore, application of the proposed switch circuit to a matrix converter is discussed and is confirmed by experiment. 相似文献
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Three new MOS-C oscillators using the current feedback op-amp are presented. The proposed oscillators have the advantage of independent control of the oscillation frequency and the condition of oscillation. Two of the proposed MOS-C oscillators provide two outputs in phase quadrature. The third proposed oscillator provides two outputs in the balanced form. PSpice simulation results for the proposed oscillators are given. 相似文献
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A New CMOS four-quadrant analog multiplier is presented in this paper. The proposed multiplier is suitable for low supply-voltage
operation and its power consumption is also very low. The proposed circuit has been simulated with the HSPICE and simulation
results are given to confirm the feasibility of the proposed analog multiplier. According to the simulation results, under
the supply voltage of 1.5 V, the input range of the proposed multiplier can be 120 mV and the corresponding maximum linearity
error is less than 3.2%. Moreover, the power dissipation of the proposed circuit is only 6.7 μW. The proposed circuit is expected
to be useful in analog signal processing applications. 相似文献
20.
该文提出一种通用稀疏系统识别Lawson-lncosh自适应滤波算法,该算法采用系数向量的Lawson范数和误差的lncosh函数构建代价函数。Lawson范数约束引入参数p,实现稀疏约束滤波动态调整,所提算法可以提高稀疏系统识别时的收敛速度,减小了稳态误差。误差的lncosh函数具有良好的抗脉冲噪声性能。然后,算法分析了步长参数的取值范围和参数p对算法性能的影响。计算机仿真结果表明,在高斯信号输入和色信号输入情况下,所提算法的性能要明显优于其他现存算法,且具备稀疏约束可控特性。 相似文献