Advanced Materials Research Vols. 760-762

Abstract: The real-time radar signal sorting is one of the key technologies for electronic reconnaissance, first analyzes the defects of traditional main sorting algorithms, and then proposes a comprehensive main sorting algorithm. The method first uses the SDIF algorithm to sort PRI fixed and PRI stagger radar signal, then uses dynamic expansion association method to search PRI jitter radar signal. When using the SDIF algorithm, in order to improve the efficiency of extraction of PRI, first taking amplitude pretreatment, then only accumulate the signals whose amplitude meet certain requirements. After extracting PRI, extract to the original full pulse sequence. Simulation results show that the method of sorting has high accuracy and good real-time.

Abstract: An improved multi-plane imaging fusion algorithm for 3-D digital holography is presented. Multiple reconstructed images at different distances from single off-axis Fresnel digital hologram are fused using discrete cosine transform (DCT) with different blocks. The zero order term is removed using a Laplacian operator while the conjugate image and dispersed images of defocused objects are eliminated by selecting a simple rectangular window before image fusion. Compared with those fused images obtained directly from the reconstructed images, the fused images qualities are greatly improved and all of the objects will be clearly in focus more quickly than discrete wavelet (DWT) based fusion method.

Abstract: A design of 10Gb/s VCSEL driver IC in 0.18μm CMOS process is presented. Employing directly coupled three stages of differential amplifiers, active degenerative feedback and C³A structure, the monolithically integrated circuit can amplify the amplitude of input differential signal to 22mA and offer a bandwidth of 9.4GHz at 10Gb/s with a total power consumption of about 91mW. The driver circuit can offer adjustable modulation current from 1 to 16mA and adjustable bias current from 1 to 10mA. The VCSEL driver can be used in the STM-64 optical fiber communication system.

Abstract: The indoor communications is a new market in the future. This Article introduces one data transmission system based with OFDM signals. The overview of the communication system and synchronization theory background will be introduced. The simulation results shown in this article implies that this OFDM system achieves excellent performance for indoor wireless communication.

Abstract: The Internet of Things is a bearer network based on the Internet, the traditional telecommunications network, wireless self-organizing networks etc, so that all can be individually addressable ordinary physical objects to achieve the interconnection network. The Internet of Things is evolved from the wireless sensor network, which has limited resource in energy, memory, calculation, bandwidth and etc,. In addition, many applications in the Internet of Things are related to user privacy. In the process of data collection and transmission, the data may be forged , tampered, and a variety of other information security threats. In order to extend the network lifetime, to protect the authenticity and reliability of data fusion, this paper presents a reputation model of data fusion algorithm. The algorithm is verified by simulation, the experimental results show that the proposed algorithm is effective and the result of data aggregation is reliable.

Abstract: An improved UWB non-coplanar power divider is presented. To improve the performances of the power divider, a tapered slot and a fan-shaped slot are used in the circuit design. The simulated results show a better return loss of input port.

Abstract: The amount of data transmission in Electronic commerce (E-commerce) is growing, and the security requirements are also increasing. During the data transmission , the data transmission module is divided into four parts, They are respectively: the Internal network, isolation module, firewall and the untrust domain or external network. At the isolation module, the exchange isolation unit, data transmission unit, file transfer unit, and other units and engines, are set. The security is enhanced in e-commerce in many ways, the large flow of data transfer between different trust domains.

Abstract: In order to effectively manage the communication nodes in Mobile Ad Hoc Network (MANET), it is important to know the topology of such networks. Traditional Ad-hoc On-demand Distance Vector (AODV) protocol can not get the MANET topology due to the lack of the topology discovery mechanism. Aiming at this problem, an enhanced topology discovery algorithm based on AODV (AODV-TD) is proposed. AODV-TD can not only obtain the topology of dynamic network by topology discovery request, but also realize route discovery among nodes. Finally, the proposed algorithm is implemented on a hardware platform using CC1100, and the experiment results show that, even the network changes dynamically, AODV-TD can still discover the network topology rapidly and accurately, so that contribute to reducing the route discovery time and the RREQ forwarding packets.

Abstract: Optoelectronic Devices have obtained great interests for many decades. With the development of technology and in-depth research, the devices are scaled down rapidly, reaching sub-millimeter or even nanometer scale, and resulting in various new features. In recent years, a so called Self-Switching Device (SSD) which has diode-like I-V characteristics has attracted more and more attentions. Using Monte Carlo method, we have studied the electron transport in the self-switching device. Simulation results show that when the device size is smaller than the mean free path of electrons, the electron velocity is very different from that of larger device. The electron velocity and the energy become faster and higher, respectively. The reason of this phenomenon is explained by ballistic transport of electrons in the small size device. Since ballistic transport plays an important role in determining the behavior of electrons in small size device, it is need to be included in nanometer scale device modeling.

Abstract: A loophole-free minimum overlap model is proposed to calculate the minimum repeaters under the condition of complete coverage and accommodating a certain number of simultaneous users. We first employ the Pulse Code Modulation to calculate the bandwidth occupied by each user. Subsequently, by taking the spectrum division and Frequency Division Multiple Accesses (FDMA), we produce the maximal number of person available to one repeater. Finally, we estimate the loophole-free minimum overlap model to yields the minimum number of repeater. The experiment result shows that the proposed method is practical and effective.