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With the development of wireless technologies, wireless networking market is thriving. IEEE 802.16J mobile multi-hop relay (MMR) network is likely to achieve great market success because it provides an attractive solution for the coverage extension and throughput enhancement of IEEE 802.16e network. However, security issues can restrain its development. IEEE standard 802.16J-2009 has been published...
The parameters of CMOS device will be affected by the variation of temperature and process variation. Due to these variations, a ring oscillator implemented in CMOS process will not have an constant output frequency which is designed in CAD tools. In order to get a constant frequency, additional circuit is needed to compensate the variation in both temperature and process. After investigate the drawback...
This work proposes a new phase frequency detector, which completely eliminates the “blind zone” by avoiding generating the reset signal when the input phase error is out of the range of [-π, π]. The proposed phase frequency detector possesses a beneficial nonlinear transfer characteristic and can speed up the lock acquisition of a phase-locked loop effectively.
Modular multiplication is the fundamental operation in most public-key cryptosystem. Therefore, the efficiency of modular multiplication directly affects the efficiency of whole crypto-system. This paper presents implementation and comparison of several recently proposed, highly efficient architectures for modular multiplication on FPGAs: interleaved multiplication, two variants of Montgomery multiplication,...
In this paper, an improved design of data driver for organic light-emitting diode (OLED) displays is presented. The proposed scheme controls brightness of OLED by adjusting the amplitude using MSB data and width of the current using LSB data. The simulation results show that the uniformity of the output current is improved. The power consumption also is reduced.
A 16-bits Constant-Current LED Driver Integrated Circuit (abbreviated as “Driver”) is presented in this paper. It is fabricated with 0.6-μm 2P3M CMOS process in an active area of 0.9mm × 0.9mm. The driver provides 16 open-drain, constant current sinking LED driver outputs. All the constant-current outputs are programmed together by a signal external resistor. Post simulation result shows that each...
This paper presents an improved algorithm for detecting the SYN flooding attacks. The algorithm is based on the characteristics of the network processor IXP2850's hardware and software framework. It improves the typical method that is based on checking the received SYN segments twice from the same source. The improved algorithm will label the segments first, and then verify them to determine whether...
Network on Chip (NoC) has emerged as a competitive and efficient communication infrastructure for multi-core System on Chip, of which there are three kind of components, processing element(processor, memory, IP, etc), communication element(such as router) and interface module between router and PE. One of the key problems is how to solve the memory bottleneck under the circumstances that multiple...
A second-order compensated bandgap reference (BGR) using current proportional to absolute temperature (PTAT) is proposed in this paper. This proposed BGR utilize a PTAT current to improve the temperature coefficient (TC) of base-emitter voltage VBE, and make temperature characteristic of the BGR optimized. The simulation based on nee 2um BiCMOS process library shows a lower TC (only 9.07 ppm/°C) and...
Unlike traditional SoC (System-on-chip) chip, multiprocessor chip that contains multiple independent processors, each processor owns different applications, so we need to make a reasonable multiprocessor chip initialization program. This paper proposes a design for the multiprocessor system initialization. The main contribution is as follows: Firstly, one method for the implementation of multiprocessor...
The formulas were derived for the calculation of the permittivity of dielectric measured in TE109 mode rectangular cavity and TE011 mode cylindrical cavity. A testing system based on scalar network analyzer was adopted to measure the same sheet dielectric by the two cavities above respectively. The testing software based on LABVIEW was developed. The results showed that the measuring error was less...
Achieving key agreement in wireless sensor networks (WSN) is a very hard problem. Many key agreement schemes come with a shortage of considering sensor addition, revocation, and also rekeying. This paper proposes a key distribution protocol based on the public key cryptography, RSA, and DHECC. The proposed protocol does not trust individual sensors, and partially trust the Gateway. Our protocol establishes...
Because of the limited processing ability of wireless distributed network devices, most of the equipment are using symmetric encryption algorithm to encrypt the data, both communications need a shared secret key and it should be changed regularly in the service. But the key agreement process is vulnerable to eavesdropping attack, modification attack, man-in-the-middle attack, and so on. This paper...
In this paper, we design and implement 3D scan conversion algorithm using Handel-C language. Primarily we introduce the 3D graphics rendering process and analyze the principle of improved scan conversion algorithm. Then we design and implement the improved scan conversion algorithm. Finally we translate the Handel-C code into Verilog-HDL code and verify the design in ModelSim. Parallel optimization...
System design and performance are presented for an experimental FM-DCSK radio system with a blind timing acquisition scheme. The transmitter and receiver architecture is proposed, and a novel two-stage blind bit synchronization algorithm for a fast and efficient timing acquisition process is introduced. This synchronization scheme exploits the waveform repetition pattern which naturally present in...
In this paper, a digital calibration algorithm for an ultra high-speed folding and interpolating analog-to-digital converter in 0.18-μm CMOS technology is presented. The spice simulation result shows the digital foreground calibration algorithm can efficiently improve the linearity of the ADC.
A 9-bit, 125MSPS, power scaleable MDAC applied in high performance pipelined ADC in 1.8V supply voltage, 0.18um CMOS process is presented in this paper. The related circuits: a high gain, high unit gain bandwidth operational amplifier with gain boosting, common-mode feedback and bootstrap are proposed. Additionally, when the sampling rate is changed, the power of the whole MDAC can be significantly...
Computational verb numbers, as a special kind of computational verb, play an important role in designing computational verb gain-scheduling PID controllers. In this paper, computational verb numbers in the form of “computational verb + real number” are used to construct control rules of PID controllers, and a composed computational verb similarity is designed for computational verb reasoning. Simulation...
H.264/AVC video encoding standard is a successful video compression standard after the MPEG-2/H.262. It's received much attention from academic and industrial fields. In this paper, rate control algorithm is discussed. By noticing that the H.264/AVC rate control algorithm has some disadvantages, two frame layer rate control improvement strategies are proposed in this paper, which are based on the...
Call Admission control (CAC) is an important part of radio resource management (RRM) according to certain criteria, CAC determines whether the call is admitted to access or not. CAC is an important means to guarantee the quality of service (QoS) in wireless network. This paper analyses the multi-user detection factor on the uplink load of TD-SCDMA system and the effects of adjacent cell interference...
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