Zongjue Qian

High Throughput, Pipelined Implementation of AES on FPGA

The FPGA-based high throughput 128 bits AES cipher processor is proposed in this paper. We present an equivalent pipelined AES architecture working on CTR mode to provide the highest throughput up to date through inserting some registers in appropriate points making the delay shortest, when implementing the byte transformation in one clock period. The equivalent pipelined architecture does not change the data stream direction but change the inner process order in round transformation. Xilinx Foundation ISETM 10.1 FPGA design tool is used in the synthesis of the design. And the throughput of 73.737Gbps, clock frequency of 576.07MHz and resource efficiency of 3.21Mbps/LUT are provided by the proposed equivalent pipelined AES architecture. The proposed design reach higher throughput than the other designs up to date, and its resource efficiency is also very high.

Study on Preliminary Performance of Algorithms for Network Traffic Identification

At present, more and more scholars paid attention to accuracy rate of Internet traffic identification, but not on construction model time, test time, CPU utilization, memory consumption, and concision of models description between different algorithms. However, these indicators played a decisive role in performance of practical internet traffic identification system. So, we collected traffic from existing operatorspsila networks, and tested 15 kinds of supervised learning algorithms and so on. The multivariate evaluation method was proposed to assess the test results. The results show that the 15 kinds of algorithms have similar accuracy rate, but their construction model time, test time, and concision of models description are very different. The C4.5 algorithm is the most suitable classification algorithms for network traffic identification.

OFDMA System with Dynamic Bandwidth Allocation in Passive Optical Networks

A scheme on orthogonal frequency division multiple access (OFDMA) system with dynamic bandwidth allocation is investigated in passive optical networks (PONs). The system supports various applications and enables dynamic bandwidth allocation among these applications. Digital signal processing (DSP) unit as an important component is utilized for flexibility in PON. The simulation results show that the bit error rate (BER) performance of OFDM signal with quadrature amplitude modulation (QAM) is good after fiber transmission.

An Automated On-line Traffic Flow Classification Scheme

Traffic classifications based on Statistics methods and Machine Learning techniques have attracted a great deal of interest. One challenging issue is that most of supervised algorithms need traffic application information and training data sets to generate classification model offline, which is infeasible to cope with the fast growing number of new applications and online traffic classifications. Cluster algorithms are promising methods. How to identify the feature subset suitable for cluster algorithm is a critical question in our proposed online traffic classification architecture. Two feature selection algorithms Wrapper Search Approach and Correlation-Based Filter Approach are evaluated to find an optimal feature subset. The experiment results demonstrate that Wrapper Search Approach outperforms Correlation-Based Filter Approach in the automated classification architecture.

Next-Generation Passive Optical Network Based on OFDM Transmission

We investigate passive optical network (PON) based on optical orthogonal frequency division multiplexing (OFDM) transmission as a solution for next-generation optical access network. Compared with other PONs, the system improves the bandwidth efficiency and increases the flexibility to allocate resource dynamically among various services. We present simulation results on the bit error rate (BER) performance of OFDM signal with quadrature amplitude modulation (QAM) after 20km fiber transmission. It is shown that significant progress mainly relies on the implementation of high-speed digital signal processing (DSP).

The Co-existing Interference Analysis between TD-SCDMA and WiMAX

TD-SCDMA and WiMAX systems will coexist in a specific band because of the sprectrum planning and operating principle. It will result in the coexisting interference between these two systems. We analyze the coexisting interference between TD-SCDMA and WiMAX systems by system simulation. And give the conclusion about the interference from TD-SCDMA system to WiMAX system, as well as the interference from WiMAX system to TD-SCDMA system.

The Algorithm of Color Image Watermarking Based on SIFT

This paper presents an anti-geometric attacks algorithm of color image watermarking based on scale-invariant feature transformation. Firstly, detecting SIFT feature points in the red component of true color image and filter out the feature points information; Then three level wavelet transform is performed on the blue and green component of the color image and extract the low-frequency component coefficient. Finally, binary watermark which has been scrambled is embedded in the low-frequency wavelet coefficients of blue component. The simulation results show that the algorithm is robust against signal processing and geometric attacks.

OCDMA over WDM System Based on Chebyshev-Map Chaotic Spread Spectrum in Passive Optical Network

We propose optical code division multiple access (OCDMA) over wavelength division multiplexing (WDM) in passive optical network (PON) based on Chebyshev-map chaotic spread spectrum. The system avoids the limitation of available wavelength channels and optical codes to the capacity, supports more subscribers by providing the same code at different wavelength channels. The scheme on Chebyshev-map chaotic spread spectrum is analyzed, consequently numerous-deterministic-regenerated chaotic sequences are provided. Performance analysis and simulations demonstrate the sequences have favorable correlation properties and bit error rate performance, and they can restrain the effect of multi-access interference.

OCDMA-WDM-PON with Two-level chaotic Logistic-map as spread spectrum sequence

A novel optical-code-division-multiplexing-access (OCDMA) wavelength-division-multiplexed (WDM) passive-optical-network (PON) scheme using two-level chaotic Logistic-map as spread spectrum sequence is investigated to extend the capacity of optical access network for the first time.