Chaotic solutions of (2+1)-dimensional Broek Kaup equation with variable coefficients

In this paper,an improved projective approach is used to obtain the variable separation solutions with two arbitrary functions of the (2+1)-dimensional Broek-Kaup equation with variable coefficients (VCBK). Based on the derived solitary wave solution and using a known chaotic system,some novel chaotic solutions are investigated.     

Performance of a Multicarrier CDMA System with Rayleigh Fading Multipath Channels

This paper examines the performance of a multicarrier CDMA system in a Rayleigh fading channel without a RAKE receiver. Since the multicarrier technique is a diversity reception technique used in the frequency domain, the signal is transmitted at different frequency bands and undergoes different fading. The superimposed signal of the multipath components after going through the mobile channel will be processed by an Fourier Transform to enter the frequency domain, where the time delays in various paths are converted to the phase shifts in the compound signal. In this paper, we use sounding bits to extract the characteristics of the mobile channel and to partly remove the multipath effect. From the simulation, it is found that the multicarrier technique is simpler than the technique used in the single carrier system with a RAKE receiver while producing a better performance than that of the RAKE receiver.     

无线传感器网络中基于多比特量化数据的滚动时域状态估计

该文基于多比特的量化策略,提出了无线传感器网络中多比特分布式滚动时域状态估计算法。每个传感器节点预先设定一个包含多个阈值的阈值簿,利用这个阈值簿将观测值量化成多比特,融合中心接收这些比特信息运用滚动时域的思想得到系统的状态估计值,与预期相同。仿真结果表明阈值簿中阈值个数越多则估计的结果会越精确。与单比特滚动时域状态估计方法相比,该方法避免了每一时刻传感器节点接收融合中心的反馈状态估计值用来设计阈值,并且在多比特信息下状态估计值的精度更高。     

基于优化DA算法的高阶高精度半带滤波器的FPGA实现

随着FPGA技术的稳步提高,FPGA替代其他技术用于实现高速信号处理已经变得切实可行。针对高阶高精度半带滤波器十分消耗FPGA硬件资源的问题,本文提出了采用部分查找表分布式算法及高低位分割处理的改进结构,并通过一个6阶5位低通FIR滤波器进行原形设计,验证了所提出的方法的正确性。仿真结果表明,采用这种方法,在大大减少了FPGA硬件资源的同时,显著提高器件的运算效率。     

测量数据有效数字位数的确定与运算的应用

结合国家计量技术规范和实际应用情况,对测量数据有效数字位数的取位、计算等问题进行了深入的探讨。通过实例,对有效数字的一些概念和问题进行了论述,阐述了能够保证测量精度的测量结果有效数字位数确定、数值修约规则与运算规则等正确方法,解决了有关数据修约与运算所带来的、影响测量结果的问题。     

Quantum packet switching generation using correlated photons in a microring resonator system

We propose a new system of a packet of quantum bits generation using a soliton pulse within a microring resonator. A quantum gate can be formed by using a polarization control unit incorporating into the system. The random signal and idler pairs can be formed within the photon correlation bandwidth, which can be generated, and randomly form the packet quantum bits, i.e. quantum packet switching. Each random code (logic) can be performed by combining the signal and idler of each entangled photon pair via the quantum gate. Results obtained have shown that the packet of quantum logic bits can be generated using the entangled photon pairs generated by the proposed system.     

Quantum bits generation using correlated photons: Fidelity and error corrections

We propose a new system of quantum bits generation using a soliton pulse within a micro ring resonator. A quantum gate can be formed using a polarization control unit incorporating into the system. The random signal and idler pairs can be formed within the photon correlation bandwidth, which can be generated and randomly formed the packet quantum bits, i.e. quantum packet codes. Each random code (logic) can be performed by combining the signal and idler of each entangled photon pair via the quantum gate. Results obtained have shown that the packet of quantum logic bits can be generated using the entangled photon pairs generated by the proposed system. The quantum bits transmission fidelity and error corrections are also described.     

一个具有改进开关逻辑的12位1MHz采样速率的低功耗逐次逼近型模数转换器

作为数据采集系统中的关键模块,逐次逼近型模数转换器的功耗决定了整个系统的功耗水平。本文给出了一个具有改进开关逻辑的12位1MHz采样速率的低功耗逐次逼近型模数转换器。通过采用所提出的开关逻辑,该逐次逼近型模数转换器的功耗和面积跟采用传统开关逻辑的逐次逼近型模数转换器相比都会有很大的降低,其中开关逻辑的平均功耗大约降低了80%,总的电容面积减小50%。不仅如此,文章还提出了一种简化的数字控制逻辑来降低数字控制电路的功耗和面积。仿真结果表明和传统的数字控制逻辑电路相比,提出的简化数字逻辑的功耗可以减小大约50%。所设计的芯片在标准的0.35微米的CMOS工艺下进行了流片,芯片内核的面积为1.12平方毫米。在-55℃到150℃温度变化范围下,芯片100KHz的输入信号可以测得64.2dB的SNDR。在给定3.3V的电源电压下,芯片的功耗仅为0.72mW。     

Hybrid Spintronic Materials from Conducting Polymers with Molecular Quantum Bits

Hybrid materials consisting of organic semiconductors and molecular quantum bits promise to provide a novel platform for quantum spintronic applications. However, investigations of such materials, elucidating both the electrical and quantum dynamical properties of the same material have never been reported. Here the preparation of hybrid materials consisting of conducting polymers and molecular quantum bits is reported. Organic field-effect transistor measurements demonstrate that the favorable electrical properties are preserved in the presence of the qubits. Chemical doping introduces charge carriers into the material, and variable-temperature charge transport measurements reveal the existence of mobile charge carriers at temperatures as low as 15 K. Importantly, quantum coherence of the qubit is shown to be preserved up to temperatures of at least 30 K, that is, in the presence of mobile charge carriers. These results pave the way for employing such hybrid materials in novel molecular quantum spintronic architectures.