The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A new method for blind separation of multiple communication signals received by a single sensor is presented in this paper. Based on the different rates and waveforms of communication signals, we employ oversampling and singular value decomposition (SVD) to turn a single demixing problem into the estimation problem of waveform and symbol that can be solved by conventional independent component analysis...
In this paper a CPW-fed conformal slot antenna design has been proposed that produces end-fire radiation. Conventional slot antennas use large tapers to produce end-fire radiation. The presence of large tapers in the antenna can lead to antenna breakage when it is mounted on a high speed vehicle such as a missile. The design in this paper is capable of producing end-fire radiation without using a...
The Nth Power Nonlinear Transformation (NPT) is a common method for automatic modulation classification, especially for PSK signals. However, greater than Nyquist rate sampling is essential for features extraction in NPT. In this paper, introducing the compressive sensing (CS) theory, we propose a novel Automatic Modulation Recognition (AMR) method based on the frequency spectrum of the Nth power...
The multi-antenna configurations used in MIMO (multi-input multi-output) system can greatly improve the transmission reliability and channel capacity. Antenna selection technique can reduce the implementation complexity and hardware cost while maintaining the advantages of MIMO system. Aiming at selecting the optimal antenna subset quickly in the changeable channel environment, a binary particle swarm...
A new antenna suitable for cognitive radio system is proposed. The structure of the antenna is composed of an ultra wide band (UWB) sensing antenna, and a frequency reconfigurable communicating antenna. It has a capability to operate in wide band (2.4–12GHz) and three narrow bands (band I: 3.05–3.8GHz, band II: 2.35–2.98 GHz, 4.3–4.5GHz and band III: 1.45–2.18GHz). Three switches are used to control...
This paper considers the problem of coherent integration under multipath scenario. With the geometry feature for sea multipath, the signal to noise ratio (SNR) in the receiver shows obvious fluctuation on the range-elevation dimensions plane because of varying interference effect between direct and indirect echoes. With the frequency diversity technique, a new structure detector is introduced for...
In this paper, we analyze the performance of radio over free space optical communication (RoFSO) system with spatial diversity reception technology (SDRT) operating over the gamma-gamma (GG) atmospheric turbulence channel. The bit error rate (BER) and outage probability of the system have been derived in closed form expressions using the generalized power series. For the same aperture size of the...
We present here our recent result on reducing the losses of a multiple-folded tunable microstrip line phase shifter based on liquid crystal (LC) for the regime of low microwave (MW) frequencies. It is shown that the insertion and return losses can be decreased through the minimization of the electromagnetic (EM) wave discontinuities in the folded microstrip line structure. Based on a modified 6-folded...
This paper presents a planar millimetre-wave (mmwave) band pass filter based on substrate integrated waveguide (SIW) and substrate integrated coaxial line (SICL) techniques. Four half wavelength mircrostrip resonators are imbedded in the SIW cavity to improve Q-factor. Due to the closed configuration which eliminates radiation loss, the filter presents a relatively low insertion loss. The proposed...
Micro-sensor motion capture (MMocap) systems do not have external references. It is challenging to estimate the displacement of human CoM (Center of Mass). This is especially true when gait pattern changes. This paper presents a novel gait pattern-aware algorithm that aims to estimate the displacement of human CoM during walking and jumping for MMocap systems. Firstly, we fuse the acceleration of...
The Fast Independent Vector Analysis (FastIVA) algorithm [1] is an effective approach to achieve the joint blind source separation (JBSS) problem. However, the authors in [1] do not give the stable analysis for the FastIVA algorithm. In this paper, we extend the work of Intae Lee et al [1] by deriving conditions for local stability for the more general case of noncircular sources. Simulations demonstrate...
IPTV services in vehicular networks are currently attracting increasingly more attentions. One essential challenge is to efficiently utilize the limited radio resources in vehicular access networks. This paper assumes that scalable video coding (SVC) is used to encode TV channels. Since TV channels usually possess different popularities, the paper proposes a novel transmission scheme, which employs...
As the stochastic and time-varying underwater acoustic channels with serious multipath delays, energy loss and distortion factors, making the modeling and estimation of the underwater acoustic channel have been difficult problems in academic circles. As to the multiple-input multiple-output (MIMO) underwater acoustic communication, the system model with multiplicative noise is proposed to characterize...
A WSN tends to be autonomic, an adaptive and distributive algorithm in Wireless Sensor Network is presented based on cellular automata mechanism, which was sourced from the thoughts of automatic breeding in biology. Each node of the Wireless Sensor Network is assumed to be equipped with CA machine, and change its state (active/stand-by) depends on the state of its neighbors. The main objective of...
This paper introduces a design of frequency synthesizer based on the combination of multi VCO. The combination of multiple VCO can output a wide frequency range of the signal, VCO signal after the decimal frequency divider, and reference signal phase, control VCO error signal obtained, locked. A combination of multiple VCO can improve the phase noise of the output signals, but will bring the loop...
A novel frequency allocation scheme based on PDF/PMF functions of random variables is proposed in this paper, which is capable of adjusting the balance between long term fairness and performance in Fractional Frequency Reuse (FFR) aided Orthogonal Frequency Division Multiple Access (OFDMA) networks. By adjusting the parameters of PDF/PMF functions the presented scheme achieves a flexible adjustment...
The design of balanced power amplifier (PA) is proposed in this manuscript which is operated from 46.0 to 66.5 GHz. The circuit is fabricated in WIN 0.15 µm GaAs pHEMT process. The performance of circuit is designed for achieving high output power and broadband characteristics. To further reduce the layout area for the coupler design, the three-dimensional of vertical coupling mode was used in the...
In this paper, an omni-directional cylindrical patch array antenna using liquid crystal polymer (LCP) technology is designed, the proposed antenna is composed of 8 linear sub-arrays fed by three-stage T-junction power divider network, and each sub-array contains 5 series-fed rectangular microstrip patches. Comparisons between measured and simulated results verify that the cylindrical patch array antenna...
In the structure of inverted Microstrip with complementary split-ring resonator, a new type of compact bandpass filter is designed. Nematic Liquid Crystal is introduced in this structure. Through changing the applied voltage, the properties of liquid Crystal are also changed , and it is easy to adjust the center frequency of the bandpass filter. Arbitrary frequency bandpass filter is easier to be...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.