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Cross Strait Quad-Regional Radio Science and Wireless Technology Conference (CSQRWC), 2012

Date 23-27 July 2012

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Displaying Results 1 - 25 of 60
  • A low computing I/Q-mismatch compensator for 3GPP LTE systems

    Publication Year: 2012 , Page(s): 118 - 122
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (521 KB) |  | HTML iconHTML  

    Variations of I/Q gains and phases of RF frontend, namely I/Q mismatch (I/Q-M), are the important impact in OFDM-based wireless accesses. Making a 2×2 MIMO-OFDM modem of 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) work properly, this work investigates a low computing cross-ratio engine to deal with serious I/Q-M by using only synchronization signal (SS). Through performance evaluation, our approach incurs a 0.3-dB SNR loss to maintain BER<;10-5 at 1-dB gain error and 15°-phase error. Hence, this work not only ensures adequate performances, but also makes low computing I/Q-M estimation and compensation. View full abstract»

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  • An early stopping criterion for LDPC decoding based on average weighted reliability measure

    Publication Year: 2012 , Page(s): 123 - 126
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (454 KB) |  | HTML iconHTML  

    An early stopping criterion for low-density parity-check decoding is proposed to reduce the number of decoding iterations. The proposed early stopping criterion is based on the average weighted reliability measure of the hard output of decoder to detect undecodable blocks in an early stage of the decoding process. Simulation results show that the proposed algorithm can achieve about 0.2-0.4 dB coding gain improvement on average while reducing up to about 50%-85% iteration for decoding at low to medium Eb/N0, compared with the existing method. View full abstract»

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  • Analysis of transient scattering from arbitrarily shaped conducting body coated with thin layer lossy material

    Publication Year: 2012 , Page(s): 11 - 14
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (463 KB) |  | HTML iconHTML  

    A time domain integral equation (TDIE) approach combined with volume equivalence principle is developed for analysis of transient scattering from an arbitrarily shaped 3D conducting body coated with a thin layer of lossy material. The method of marching on-in time (MOT) is used to solve the discretized integral equation. Numerical results demonstrate that the proposed procedure is stable and accurate. View full abstract»

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  • Calibration of digital modulation quality parameters of 802.11n WLAN tester

    Publication Year: 2012 , Page(s): 175 - 179
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (455 KB) |  | HTML iconHTML  

    This paper describes the standard instruments and calibration methods for the calibration of digital modulation parameters of 802.11n WLAN tester, and gives the analysis of the digital modulation quality parameters; finally introduces the checking parameters and checking methods for the 802.11n digital modulation output signal. View full abstract»

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  • An energy-efficient routing algorithm for data gathering in wireless sensor networks

    Publication Year: 2012 , Page(s): 137 - 141
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (560 KB) |  | HTML iconHTML  

    Data gathering is a basic function in wireless sensor networks (WSNs). With the energy constrained nature of the wireless sensor nodes, energy-efficient routing algorithms need to be carefully designed before wireless sensor networks are widely deployed for data gathering. This article proposed an energy-efficient cluster routing algorithm (ECRA) for data gathering in wireless sensor networks. Firstly, ECRA divided the nodes in WSNs into clusters. Secondly, a chain was formed in each by an improved nearest neighbor algorithm. Finally, the multi-hop was used to transmit the gathered data from clusterhead to the base station. The simulation results show that the proposed approach can distribute energy consumption uniformly among the sensor nodes, and thus prolong the network lifetime. View full abstract»

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  • An authenticated encryption scheme for automatic dependent surveillance-broadcast data link

    Publication Year: 2012 , Page(s): 127 - 131
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (604 KB) |  | HTML iconHTML  

    To meet future demand for air transport growth, break the traditional ground navigation aids facilities limitations and effectively enhance flight safety and efficiency, a new generation of air surveillance system will use automatic dependent surveillance-broadcast (ADS-B) system. However, ADS-B data link is a wireless broadcast-type link which is without designed-in security measures. Therefore potential security vulnerabilities and threats remain to be assessed and resolved. This paper aims to assess security of the ADS-B data link, and build encryption and authentication capability on the ADS-B data link to provide privacy and integrity of broadcast information. In the paper, a data link authenticated encryption (DLAE) scheme is designed for simultaneously protecting both message's privacy and its authenticity. Traditionally, these two security goals had been handled separately by means of encryption schemes and message authentication codes. The proposed DLAE can increase significantly the processing speed in comparison with the traditional design methods. View full abstract»

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  • Accurate and stable solution of time-domain electric field and magnetic field integral equation using marching-on-in-time method

    Publication Year: 2012 , Page(s): 15 - 18
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (503 KB) |  | HTML iconHTML  

    To suppress late-time oscillation in time marching algorithms of solution of time domain electric(TDEFIE) and magnetic field integral equation (TD-MFIE), it needs to accurately evaluate the time-domain impedance matrix elements and choose the appropriate temporal basis function. The paper accurately computes time-domain impedance matrix elements by transforming space-time integral of the source cell to 1D time convolution and 1D space analytical integral, Numerical results show that the proposed method ensures that the solution of time-domain electric and magnetic integral equation using marching-on-in-time method is stable and accurate. View full abstract»

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  • Parallelization of spectrum sensing algorithms using graphic processing units

    Publication Year: 2012 , Page(s): 35 - 39
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (563 KB) |  | HTML iconHTML  

    Cognitive radio (CR) is the next-generation communication system with high spectrum utilization and efficiency. It is very crucial for CR to sense the environment spectrum holes quickly and accurately. In this paper, we implement two kinds of spectrum sensing algorithms: waveform-based detection and cyclostationary feature extraction methods. Both of these algorithms are capable to separate the signal of interest from the noise or interference. In order to lower the computation time required by these complex algorithms, we parallelize these algorithms on a Graphic Processing Unit (GPU). Our methods show up to an average of 30× speedup in waveform preamble detection and an average of 39× speedup in cyclostationary feature extraction on a NVIDIA GTS 450 compared with the sequential implementation on a 2.94GHz Intel Core 2 CPU. View full abstract»

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  • Compact UWB bandpass filter using localized substrate integrated artificial dielectric (L-SIAD)

    Publication Year: 2012 , Page(s): 220 - 223
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (473 KB) |  | HTML iconHTML  

    In this paper, a multiple-mode resonator (MMR) using localized substrate integrated artificial dielectric (L-SIAD) is proposed to construct a compact ultra-wideband (UWB) bandpass filter (BPF). Due to the electromagnetic bandgap (EBG) property of L-SIAD, this MMR provides a broad upper stopband for the BPF. Meanwhile, broadside coupled-lines are used to provide tight coupling and sharp skirt for the BPF by the coupling transmission zero. Finally, such a UWB BPF is designed and fabricated. The measured results demonstrated that this filter has broad upper stopband, sharp rejection skirt, and low insertion loss in passband with flat group delay. View full abstract»

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  • Experimental research on degenerated four wave mixing in photonic crystal fibers

    Publication Year: 2012 , Page(s): 188 - 190
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1211 KB) |  | HTML iconHTML  

    We investigated the continuous wave degenerated FWM characteristic of SMF28 and PCF and measured the efficiency of the newly created frequency with respect to wavelength difference between pump and signal waves, and the FWM conversion polarization dependence on pump and signal light. The dispersion, dispersion slope and nonlinear coefficient of the fiber were determined. View full abstract»

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  • Design and implementation of a wireless power transmission system with green energy concept

    Publication Year: 2012 , Page(s): 64 - 67
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1127 KB) |  | HTML iconHTML  

    With current trend of international environmental protection standard, the features and perspective of development in communication system is wireless power transmission and green energy. This paper provides a smart wireless charging device which can charge different types of hand-held devices and power down to sleep mode to save power when charging process is completed. View full abstract»

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  • A Gilbert mixer with high gain for 18 GHz application

    Publication Year: 2012 , Page(s): 68 - 72
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (651 KB) |  | HTML iconHTML  

    The aim of this paper is presented A Gilbert mixer with passive balun for 18 GHz application. It was used Taiwan Semiconductor provided by TSMC CMOS 0.18 μm process. We proposed mixer consists of Gilbert Cell, RF and LO stage matching and the IF buffer amplifier. Finally, at the operation voltage of Vdd = 1.8 V, RF frequency =18 GHz, LO frequency =17 GHz, the conversion gain is about 11.676 dB, input P1dB and power consumption are about -15 dBm and 54 mW. The chip size including all testing pads is 0.82 × 0.79 mm2. View full abstract»

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  • Design and implementation of a low power VCO for K-Band Application

    Publication Year: 2012 , Page(s): 73 - 77
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (834 KB) |  | HTML iconHTML  

    A fully integrated low power voltage control oscillator K-Band application is presented in this letter. Using Gm-boosted architecture, the power consumption can be lower. In addition, the capacitive filtering technology can prevent the low frequency tail current noise converted into phase noise, the technology used to enhance the phase noise performance. The VCO design and implement in TSMC 0.18μm COMS technology with 1.5V supply voltage, the simulated power consumption is 15 mV, tuning range is 18.56 GHz ~ 17.51 GHz, phase noise at 1-MHz is -112 dBc/Hz, chip size is 0.496 * 0.678 μm2. View full abstract»

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  • Preamble reconstruction method for impulsive interference avoidance in MIMO-OFDM receivers

    Publication Year: 2012 , Page(s): 132 - 136
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1149 KB) |  | HTML iconHTML  

    For wireless packet transmissions, preambles are essential to make packet synchronization function. Impulsive interference not only distorts datum, but also degrades link reliability. To deal with such distortions, a peak-to-average ratio (PAPR) detection is adopted to search impulsive positions and the convolution with the estimated time-domain response is used to recovery the distorted preambles. Simulations of a 2×2 MIMO-OFDM system with RF impairments in frequency-selective fading indicate that the SNR loss is about 2.5 dB ~ 4.6 dB to ensure synchronization working at a signal-to-impulse ratio (SIR) of -10 dB. View full abstract»

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  • Integral equation based on domain decomposition method for PEC body of translation

    Publication Year: 2012 , Page(s): 19 - 21
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (471 KB) |  | HTML iconHTML  

    In this paper, a hybrid scheme named IE-DDMMLFMA with forward-backward method is proposed to calculate the scattering from the perfect electric conductor body of translation. The computational body of translation can be partitioned into concentric non-overlapping subdomains. Each of integral equation systems are solved separately, thus reducing the complexity of the original problem. Moreover, by applying two sets of MLFMA grids, a more efficient matrix-vector multiplication is implemented because of the translation invariant feature of each subdomain. The main advantage offered by this technique is a reduction in memory requirements. For the solution of the resulting linear systems we describe appropriate iterative solution strategies using generalized forward-backward method. At the same time, the iterative procedure for each subdomain is accelerated by block-diagonal pre-conditioner and OpenMP techniques. Various numerical examples are presented that illustrate its potential. View full abstract»

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  • Miniature antenna for UWB applications

    Publication Year: 2012 , Page(s): 44 - 47
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (815 KB) |  | HTML iconHTML  

    A low-cost, miniature-sized and isotropic Ultra-wideband (UWB) antenna is presented. In this paper, we will use a 3D EM simulator, HFSS, to design antenna. We employ exposure and development process to fabricate the miniature antenna, which is fed by a microstrip line and built on a FR-4 substrate with size of 22mm × 38mm2. Via measurement, the antenna's matching characteristics and radiation patterns were obtained. The frequency band designed by this study is from 3.1GHz to 10.6GHz, targeting for UWB applications. Return loss is under -10dB and the gain range of the antenna is from 2dBi to 3.3dBi in this frequency band. Meanwhile, radiation patterns comply with requirements. View full abstract»

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  • Improved AOW clustering algorithms for wireless self-organized network and performance analysis

    Publication Year: 2012 , Page(s): 142 - 146
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (488 KB) |  | HTML iconHTML  

    In wireless self-organized network (WSON), AOW clustering algorithms can achieve better performance and high adaptability, but having limitations in certain circumstances. In this paper, working procedure and shortcomings of AOW are introduced and analyzed firstly. Then, several modified algorithms based on AOW are designed according to system requirements. Simulation experiments are conducted to compare modified algorithms and original AOW algorithm and simulation results show modified algorithms can improve overall performance of clustering network further in specific scenarios. View full abstract»

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  • A method for measuring the transverse half-wave voltage of LiNbO3

    Publication Year: 2012 , Page(s): 180 - 182
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (465 KB) |  | HTML iconHTML  

    For revealing the essence of electro-optic effect and measuring the transverse half-wave voltage in LiNbO3 crystal, the strict derivation method from the physical mechanism was put forward and a good method was used. The strict derivation method was from the ellipsoid equation for the light propagation. When LiNbO3 crystal had carried the voltage in transverse the coordinate system did not rotating only the lengths of the main axle were changed. The Taylor expansion was used, the higher order small magnitudes were omitted, and the Pockels effect was deduced. The good method of the experiment was that the maximum putout was 600V for the power supply with a 1/4 wave plate were used under laboratory conditions. The transverse half-wave voltage could be determined 360V. The ratio of the length and thickness of LiNbO3 crystal sample could be judged about 7 was agreed with the practical sample from the theory of strict derivation. The results shown that the methods were suit for measuring the electro-optic characteristics of all electro-optic material. View full abstract»

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  • Optimal of LED assembled light source for strawberry

    Publication Year: 2012 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (563 KB) |  | HTML iconHTML  

    The plants growth included photosynthesis, photo morphogenesis, photoperiod adjusting and light intensity selectivity with spectrum. Multi-LED lighting for strawberry mainly confirms the main spectrum to match emission spectrum with the selective absorption spectrum of plants; Matching a variety of appropriate wavelength LED; The present system simulated sunlight from the visible light range to the infrared light. The LED light intensity all be regulate arbitrary in the range and simulate spectral distribution of the sunlight on time by pulse width modulation(PWM). A phalanx with 9 lines and 9 rows was adopted. View full abstract»

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  • Design and particle-in-cell simulation of sub-terahertz extended interaction oscillator

    Publication Year: 2012 , Page(s): 161 - 163
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1180 KB) |  | HTML iconHTML  

    In this paper, a novel sub-terahertz (THz) extended interaction oscillator (EIO) is presented. With the help of a three-dimensional (3D) particle-in-cell (PIC) simulation, design and optimize geometry of THz EIO is performed, which is composed of ladder loaded rectangular waveguide. In present work, the operation center frequency of THz EIO is 95GHz, and the out power 2.0kW is achieved, the efficiency reaches 20.8%, which is operating at voltage and beam current is 16 kV and 0.6A, respectively. View full abstract»

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  • An efficient bit-flipping decoding algorithm for LDPC codes

    Publication Year: 2012 , Page(s): 109 - 112
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (481 KB) |  | HTML iconHTML  

    In this paper, a new method for improving hard-decision bit-flipping (BF) decoding is proposed for low-density parity-check codes. The flipping criterion is derived theoretically from the soft-decision belief-propagation decoding algorithm. The proposed BF decoding algorithm is channel independent and is improved by introducing a more efficient method for computing the reliability of the parity checks. Extensive simulations are provided to demonstrate the efficiency of the proposed algorithm. Simulation results show that the proposed algorithm can achieve about 1.5dB coding gain improvement at BER = 5×10-6 while reducing up to 48% iterations for decoding and maintaining low decoding complexity, compared with the conventional weighted BF algorithm. View full abstract»

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  • Implementation of low dropout regulator with low bandgap reference voltage circuit for RFID tag applications

    Publication Year: 2012 , Page(s): 40 - 43
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (649 KB) |  | HTML iconHTML  

    This paper proposes a high performance LDO with low bandgap reference voltage circuit that have a low temperature coefficient and stable supply voltage for applications to RFID Tag power management module. This proposed circuit is design and implemented using the TSMC 0.35μm CMOS 2P4M process. Based on simulated and measured results, the chip size is 0.686 × 0.805mm2 with power dissipation about 1.32mW, and the operation temperature range form 0°C to 100°C with temperature coefficient about 10.52ppm/°C. The chip supply voltage can from 2.9V to 3.3V, with 4mV /V line regulation and 31uV /mA load regulation (output current from 0 ~ 100mA variation), provides an stable output voltage of 1.61V and its low bandgap reference voltage circuit output reference voltage can stable at 0.65V. View full abstract»

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  • An 11/19-GHz VCO using switchable transformer in 0.18-µm CMOS

    Publication Year: 2012 , Page(s): 78 - 81
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (690 KB) |  | HTML iconHTML  

    This paper presents a novel switchable transformer to enhance the quality factors, to reduce the chip area, and to increase the inductance tuning range. The proposed switchable transformer is applied to an LC-tank of a VCO which is designed with two wide oscillating frequency bands. By controlling the switches of the transformer, the dual-band VCO verified in a 0.18-μm CMOS can operate at two wide bands. The post-simulation phase noises are -101 dBc/Hz and -90 dBc/Hz at 1 MHz offset at 11 GHz and 19 GHz, respectively. Moreover, the tuning range is 13% at 11 GHz and 6% at 19GHz. The chip area is merely 0.3mm2. View full abstract»

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  • A compact 90° coupler using CMOS-compatible technology

    Publication Year: 2012 , Page(s): 82 - 84
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (915 KB) |  | HTML iconHTML  

    In this paper, the design and implementation of a compact 90° coupler on a glass substrate is presented. The process provides a low-loss substrate to reduce substrate losses, and three thick metal layers to reduce conductor losses. Therefore, peak-Q factors of capacitors and inductors on the substrate can reach 90 and 30 at least, respectively. Benefiting by these superior passive components, the 5.2-GHz coupler demonstrates a compact design with low insertion losses. The insertion losses are less than 0.97 dB, and the phase difference between in-phase/quadrature outputs is 88.2°. Moreover, the return loss and isolation is 20.2 dB and 22.5 dB, respectively. The chip size including all testing pads is 2.26 × 1.4 mm2. View full abstract»

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  • Transient analysis of radiation for high gain and directivity antennas

    Publication Year: 2012 , Page(s): 22 - 26
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (562 KB) |  | HTML iconHTML  

    The time domain analysis of scattering field for high gain and directivity antennas are presented in this paper. A time domain (TD) transient analysis of the electromagnetic (EM) fields scattered from a perfectly conducting parabolic reflector antenna when it is illuminated by impulsive plane wave and general astigmatic Gaussian Beam (GB) fields, then elliptical reflector antenna illuminated by impulsive plane wave. The potential applications of near-field antennas continue to grow dramatically and desire more exploration in the near future. Phased array antennas for near field focusing radiation are also presented in this paper. View full abstract»

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