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Hao L.,Guangdong University of Technology | Yu J.,Allwin Telecommunication Co. | Zeng W.,Allwin Telecommunication Co.
2010 IEEE International Conference on Information and Automation, ICIA 2010 | Year: 2010

In mobile multimedia network, the digital repeater with echo cancellation is the key equipment. In order to keep the repeater stable, the echo canceller is used to reduce the impact of the unwanted echoes. This paper proposes one method to implement echo cancellation in multimedia network, and gives the hardware implementing solution. Furthermore, we design the digital repeater with echo canceller according to the method. Verified by simulation and actual repeater, the proposed method is a very good way to implement echo cancellation for digital repeater. The echo cancellation algorithm is reliable and hardware cost is low. The method can greatly increase output power of digtal repeater. ©2010 IEEE.

Liu J.,Northeastern University China | Liu X.,Northeastern University China | Sha M.,ALLWIN Telecommunication Co.
Advances in Intelligent Systems and Computing | Year: 2014

We propose a detection algorithm based on time delay and topology. Node uses RTT to detect its suspicious neighbors and establish its neighbor list. Then, node finds the abnormal network topology with its neighborhood information. If three or more nodes occur, which are mutually non-1-hop neighbors, in the intersection of the two nodes which are 2-hop neighbors, there is wormhole attack. Then, the false neighbors are isolated. The simulation results show that the algorithm has high detection rate. © Springer India 2014.

Liu J.,Northeastern University China | Chen H.,Northeastern University China | Zhen Z.,Academy of Equipment Command and Technology | Sha M.,ALLWIN Telecommunication Co
Advances in Intelligent Systems and Computing | Year: 2014

The wormhole attack is a kind of attack that is focusing on routing protocols and having big destructiveness. We propose a path-tracking method based on detecting nodes. It deploys a number of detecting nodes on the edge of the network to find all disjoint paths between them, then to identify a suspicious path that has the smallest hops according to the characteristic of wormhole attack. The detecting node sends a tracing packet to intermediate nodes through the suspicious path, to find and isolate infected nodes. Simulation results show that this detection algorithm resists the wormhole attack effectively and ensures the network security. © Springer India 2014.

Wang Z.,Hebei University | Zhu C.,Hebei University | Xue W.,Hebei University | Yang J.,Allwin Telecommunication CO.
WIT Transactions on Information and Communication Technologies | Year: 2014

Relay technology as one of the key technologies for next-generation mobile communication system has attracted wide attention. The paper studies the evolution of the architecture of the long-term evolution (LTE) Relay. First, we introduce the LTE Relay technical concepts, and then collate the LTE Relay system architecture specified in the 3rd generation partnership project (3GPP) and analyze advantages and disadvantages of the different stages in release 9/release10/release11 (Rel-9/Rel-10/Rel-11) specified in LTE Relay system architecture. Finally, we point out the technical problems in the LTE Relay system, and give the LTE Relay trends analysis. © 2014 WIT Press.

Ji C.,Northeastern University China | Wang Y.-R.,Northeastern University China | Sha M.-B.,Allwin Telecommunication Co. | Yang Z.-Y.,94816 PLA Troops
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2014

High order FastICA(fast independent component analysis) algorithm has the characteristics of simple form and quick convergence. However, the algorithm is sensitive to its initial value which affects the convergence effect and even results in non-convergence if it is not chosen appropriately. In order to solve this problem, a relaxation factor is introduced into high order Newton iterative method. Through the appropriate correction, the improved high order FastICA algorithm can be obtained, which can not only guarantee the convergence speed, but also effectively overcome the initial value sensitivity problem. Applying the algorithm to the separation experiment of speech signals, the result shows that the proposed algorithm effectively separates the mixed signal, and reduces the dependence on the initial value.

Ji C.,Northeastern University China | Tang B.,Troops 65521 PLA | Yang K.,Northeastern University China | Sha M.,Allwin Telecommunication Co.
Lecture Notes in Electrical Engineering | Year: 2013

The traditional natural gradient algorithm works badly when the source signal amplitude changes rapidly or becomes zero at a certain time. In addition, it cannot resolve very well the contradiction between the convergence speed and the error in steady state because the step-size is fixed. In order to solve the above problems, this paper proposes an improved blind source separation algorithm based on non-holonomic natural gradient by choosing an adaptive step-size and a suitable nonlinear activation function. Simulation result demonstrates that the new algorithm performance is superior to the traditional natural gradient algorithm. © 2013 Springer-Verlag.

Dai J.,Shenyang Ligong University | Zhang G.,Yichun University | Zhao K.,Allwin Telecommunication Co.
Applied Mechanics and Materials | Year: 2012

A adaptive interference cancellation algorithm was proposed in this paper, which was based on NLMS algorithm.The NLMS algorithm was achieved on FPGA chips. This paper described the method of the specific implementation. This method introduces bit-shift in terms of subsection instead of division operation, by which the operation speed of FPGA is improved apparently.By Matlab simulating the functions, and analyzing the PSD curve and the constellation of output signals, the adaptive interference cancellation algorithm system based on NLMS achieved expected effect. The better in-band flatness of the PSD curve and the higher convergence rate on constellation were obtained. Therefore, the NLMS adaptive interference cancellation algorithm is chosen as the design with High Performance-price Ratio.

Liu Q.-Q.,Shenyang Ligong University | Liu Q.-Q.,CAS Shenyang Institute of Automation | Liu Q.-Q.,Allwin Telecommunication CO. | Shen W.-R.,Shenyang Ligong University
ICIC Express Letters | Year: 2013

This paper addresses the state feedback stabilization problem for linear timeinvariant systems, where the sensors and the controller are geographically separated and connected over a digital communication network. In particular, the case with the channel propagation delays is considered. A quantizer-controller pair is constructed to stabilize the unstable plant in the mean square sense. The sufficient condition on the data rate of the channel for stabilization is derived. An illustrative example is given to demonstrate the effectiveness of the proposed method. © 2013 ICIC International.

Liu Q.-Q.,Shenyang Ligong University | Liu Q.-Q.,CAS Shenyang Institute of Automation | Liu Q.-Q.,Allwin Telecommunication Co. | Shen W.-R.,Shenyang Ligong University | Li D.-D.,Shenyang Ligong University
ICIC Express Letters | Year: 2014

This paper investigates quantized feedback stabilization problems for discretetime linear time-invariant systems over noisy, bandwidth-limited digital communication channels. The packet dropout process of the channel is modeled as a Markov process. In particular, the case with limited data rates is considered. An observer-based control and quantization scheme is presented. A sufficient condition on the data rate for stabilization of the MIMO system is derived. An illustrative example is given to demonstrate the effectiveness of the proposed method. © 2014 ISSN 1881-803X.

Liu Q.,Shenyang Ligong University | Liu Q.,CAS Shenyang Institute of Automation | Liu Q.,Allwin Telecommunication CO | Jin F.,Shenyang Ligong University
ICIC Express Letters | Year: 2016

This paper investigates the minimum information rate for linear quadratic (LQ) control of stochastic linear systems, where the sensors and controllers are geographically separated and connected via noiseless, bandwidth-limited digital communication channels. A control scheme is given to achieve the minimum information rate for LQ control. In particular, we argue the tradeoffs between the control cost and the data rate of the channel, present an explicit formula on the tradeoffs between the LQ cost and the information rate, and derive upper bounds on the corresponding LQ cost under data rate limitations. © 2016, ICIC Express Letters ICIC International.

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