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In this paper, we propose higher point FFT (fast Fourier transform) algorithms for a single delay feedback pipelined FFT architecture considering the 4096-point FFT. These algorithms are different from each other in terms of twiddle factor multiplication. Twiddle factor multiplication complexity comparison is presented when implemented on Field-Programmable Gate Arrays (FPGAs) for all proposed algorithms...
Aiming at the detecting and tracking of the moving dim target with low SNR, this paper puts forward a new arithmetic of tracking before detecting based on particle filter (TBD-PF). The arithmetic proceeds background suppression with mathematical morphology filter firstly, and then estimates the state of the target using the arithmetic of particle filter. A threshold value is set when sampling newborn...
Fatigue driving is an important reason of traffic accidents. This paper proposes a practical algorithm to detect eye closure using an infrared camera to monitor and recognize driver dozing. Face and eye of the driver are first localized and then marked in every frame. After extracting the eye region, the proposed algorithm can detect eye corners, and with the eye corners restrictions, eyelids movement...
Iterative Joint Source Channel Decoding (IJSCD) is an effective technique to improve the overall performance of communication systems. However, it is based on Soft-in Soft-out (SISO) decoding of error correcting codes. In this paper, a new SISO decoding method of error resilient arithmetic codes (ERAC) is proposed, which is based on the conventional BCJR algorithm but sequentially prune nodes according...
A zero standby power remote control system used for household appliances is presented in this paper. The system consists of two parts. One is transmitting unit and power amplifier which send RF modulated signal. The other is receiving unit and power management block which recover energy, demodulate the RF signal and control the power switch of the household appliances. Both transmit and receive ends...
This article mainly focuses on the application of AES in the radio frequency identification technology. The AES circuit module integrates into radio frequency identification module to increase system front-end identification mechanism. The power analysis at different modes is performed in this work. The concept of data security warning mechanism for RFID tag is demonstrated. The process of the authentication...
Advanced Encryption Standard (AES) is one of the latest symmetric key cryptosystem standard, which is proposed to replace DES. Whirlpool is a famous hash encryption algorithm that processes the building blocks in a similar way. Although some slight differences are presented, implementing an integrated design of AES and Whirlpool on the FPGA can reduce the overall area. Further more, it provides a...
A proposed UHF RFID location system, based on a known location of the reference tags by applying the cosine theorem to calculus more location information, can provide location-aware services. In this article, the trigonometric cosine and sine functions required in the computation of the law of the cosines are realized using a Coordinate Rotation Digital Computer (CORDIC) based floating-point arithmetic...
In this paper, we study the RFID tag-reader mutual authentication scheme. A hardware design of an RFID authentication protocol conforming to EPC Class 1 Generation 2 Standards is proposed. The proposed RFID tag-reader mutual authentication protocol was simulated using Modelsim XE II and synthesized using Altera's Quartus II software. The system has been successfully verified in hardware using an Altera...
This paper presents the ASIC design and implementation of digital baseband system for UHF RFID reader based on EPC Global C1G2 /ISO 18000-6c protocol. The digital baseband system consists of two parts: transmitter and receiver, which inculing encoding module, decoding module, channel filers, CRC chenk module, control module and a SPI module. It is described in verilog HDL in RTL level, with Design...
Variable Gain Amplifier (VGA) is a crucial part of GPS receiver, because the amplitude of RF signal changes greatly in transport. So a VGA is needed to fit the signal changing. This paper presents a VGA design based on the Gilbert unit. Implemented in a 0.18um CMOS process, the circuit achieved a gain range about 20dB from 18.39dB to 38.54dB, and reached a GBW=250MHz at 38db. The total current is...
This paper presents a 2.4GHz monolithic Class E power amplifier based on Grace 0.18um SiGe BiCMOS technology. It has a two-stage structure and adopts small DC feed inductors and on-chip matching networks. Without any off-chip components, the power amplifier achieves maximum output power of 22.4dBm, and the PAE is 33% with 2V supply. After optimizing the component parameter, the input and output terminals...
This paper presents a 2.4 GHz fully integrated power amplifier based on 0.18 μm SiGe BiCMOS technology for wireless local area network applications. The power amplifier shows a 1 dB compression output power of 22.19 dBm at an input power of 0.135 dBm. A temperature-insensitive bias circuit is used in this PA design to improve the amplifier linearity. The total fabricated die size is about 1.5 mm ×...
This paper explores a unique calibration method for polarimetric radar without requiring any calibration targets. The error of the polarimetric scattering matrix measurement is modeled as antenna distortion matrices and channel distortion matrices. These distortion matrices can be determined using a signal generator in anechoic chamber. The performance of the calibration method is analyzed by simulation...
This paper explores the simultaneous estimation method of the AOA and the polarization of the signals. Based on two differently polarized antennas, the simultaneous estimation is achieved with consideration of the cross-polar and co-polar patterns of the antennas. The performance of the method is analyzed. The validity is testified by the experiment of P-band radar system.
A high-linearity power amplifier (PA) for 2.4 GHz Wireless-LAN transceiver is presented. The PA is designed and implemented using a 0.18 um SiGe BiCMOS process. An on-chip adaptive linearizer is comprised of a base-emitter diode of the bias transistor and a bypass capacitor with almost no increase in die area and no extra dc consumption. Besides the linearization function, the active biasing circuit...
Wireless sensor network (WSN, Wireless Sensor Network) is a kind of autonomous network with sensor nodes. It is different from traditional RFID system that the WSN is through the distribution of sensor nodes in different locations to monitor environmental conditions. The collected data from sensor nodes were sent back to the base station for further analysis and processing to compensate the shortage...
In this paper, a computational function based on the CORDIC algorithm for location estimation is proposed. Position awareness is a desirable feature for many applications of Wireless Sensor Networks. The Received Signal Strength Indicator (RSSI) values provide a feasible way for relative position estimation. The relationship of precision to bit length for IEEE 754 is discussed. Finally, the hardware...
A multimedia channel allocation scheme using both pre-emptive priority and traffic overflowing (PRTO) for multimedia overlay networks is proposed and studied in terms of the connection-level QoS. The contributions of our work are threefold. First, traffic overflowing strategy is introduced to improve the service continuity. When all the channels in a given macro-cells are occupied, high-mobility handoff...
Considering the issues involved in the multiple relaying cooperation such as the perfect synchronization and high complexity, some single-relay selection schemes are presented in this paper for two-way relaying networks, where this network is consisted of two source nodes and multiple relay nodes, each node with single antenna. The novel single-relay selection schemes based on the transmission rate...
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