Xue Guang Yuan

Adaptive Polarization Mode Dispersion Compensation with DPSO Algorithm

Dithering particle swarm optimization (DPSO) algorithm is introduced into adaptive polarization mode dispersion (PMD) compensation in optical communication system. The DPSO algorithm has the merits of rapid convergence to the global optimum, without being trapped in local sub-optima, and good robustness to noise. How to implement DPSO as a component of a control algorithm in adaptive polarization mode dispersion compensation is described. Performance comparisons between PSO and DPSO were carried out theoretically and experimentally.

The Network Management System of WSS-Styled ROADMs Based on Openflow

This paper presents the design and implementation of an Openflow-based Network Management System. The system consists of GUI, Floodlight Controller and Agent (s), and it enables monitoring, control and management of ROADMs. WSS and OPM are two main modules of a ROADM system. They are connected with an Agent through Protocol of Serial Port, while GUI communicates with Floodlight Controller by Socket Protocol.

The Mobile Manager of Network Management System Based on Android Platform

This paper presents a new network management system which contains a user-friendly wireless mobile manager. Compared with traditional network management system, the new system realizes the mobile management of network.

Mobile Wireless Network Management System

Mobile Wireless Network Management System provides a new concept in the research of network management. Supported by mobile terminals, the work achieves the mobilization of network management which is of great convenience and efficiency.

BER Performance Analysis of MIMO-CPolSK Using on Free-Space Optical Communications

Enslaved by atmospheric turbulence and transmission power, performance of Free-space Optical Communication (FSO) fluctuates greatly. A new communication system of MIMO-CPolSK combined the MIMO system and CPolSK modulation is proposed in this paper. According to the strength of turbulence, different mathematical models of atmospheric channel are adopted. The BER calculating formula of SISO-CPolSK is proposed at first, then the BER performance of MISO-CPolSK and MIMO-CPolSK system is presented. The result of numerical simulation shows that BER performance is greatly promoted in MIMO system and compared to OOK modulation, the SNR of receiving in CPolSK modulation is reduced about 3dB when the system has the same BER performance under the same condition.

A Polarization Stabilization Control System Based on DSP

A polarization stabilization control system based on digital signal processor (DSP) is proposed in this paper. The system uses low frequency radio frequency (RF) power as control signal for polarization stabilization, and it does not need high-speed circuit to track fast polarization change. Modified particle swarm optimization algorithm is utilized and the effectiveness of polarization stabilization control is experimentally verified.

Performance Analysis of Coherent Atmospheric Optical Communications with Soft-decision Forward Error Correction

Performance of coherent atmospheric optical communication system with heterodyne detection and LDPC codes was evaluated over atmospheric channel attenuations of which are about 20-30 dB/km. To reduce bit error and enhance the system performance LDPC code was implemented in system. Combining coherent detection and LDPC codes could reduce the received power requirement ~4 dBm at the BER of 10-9.

An application of LDPC code for wireless coherent-light commutation in atmospheric channel

Low Density Parity Check code is more and more taken seriously in high-speed transmission. In this article we represent a LDPC coder and decoder which based on IEEE802.16e and realize the coder and decoder with Virtex-5 FPGA. By using Matlab to make an off-line system simulation, we analyzed and compared the LDPC performance under the different length of code for LDPC coder then analyzed the influence of different iteration to the LDPC BER performance of decoder.

Design and Implementation of Buffer Control in EoS System

We propose an optimization approach to EoS (Ethernet over SDH) buffer control which the objective is to dynamically adjust the EoS buffer management registers. We will present the improved model of the traffic buffer management based on embedded MCU to control the SDRAM of the EoS chip, and setup the end-to-end system to illustrate the feasibility and advantage of the solution in buffer management when the data transport rate suddenly exceed the bandwidth of Ethernet port.

A Low Power Consumption and Energy Saving Solution Applied in Network Management

As the scale of network become larger and larger together with node numbers, the traditional way to manage the network becoming more and more energy-wasting. In order to improve the performance of the network equipment, we figured out a method that can reduce CPU scheduled frequency thus resulting in a decrease in power consumption.