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    Wyświetlanie 1-9 z 9
    Tytuł:
    Blind frequency offset estimation for overlap PCC-OFDM systems in presence of phase noise
    Autorzy:
    Shentu, J.
    Armstrong, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/307668.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    OFDM
    frequency offset
    estimation
    phase noise
    overlap PCC-OFDM
    Opis:
    This paper presents a technique for frequency offset estimation for polynomial cancellation coded orthogonal frequency division multiplexing with symbols overlapped in the time domain (overlap PCC-OFDM) in the presence of phase noise. The frequency offset estimator is designed based on the subcarrier pair imbalance (SPI) caused by frequency offset. The estimation is performed in the frequency domain at the output of the receiver discrete Fourier transform (DFT). No training symbols or pilot tones are required. Simulations show that this estimator is an approximately linear function of frequency offset. Phase noise does not significantly affect the variance performance of the estimator.
    Źródło:
    Journal of Telecommunications and Information Technology; 2003, 2; 17-27
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Active Inductor with Feedback Resistor Based Voltage Controlled Oscillator Design for Wireless Applications
    Autorzy:
    Faruqe, Omar
    Amin, Md. Tawfiq
    Powiązania:
    https://bibliotekanauki.pl/articles/226124.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    VCO
    active inductor
    inductance
    quality factor
    phase noise
    figure-of-merit
    Opis:
    This paper presents active inductor based VCO design for wireless applications based on analysis of active inductor models (Weng-Kuo Cascode active inductor & Liang Regular Cascode active inductor) with feedback resistor technique. Embedment of feedback resistor results in the increment of inductance as well as the quality factor whereas the values are 125.6@2.4GHz (Liang) and 98.7@3.4GHz (Weng- Kuo). The Weng-Kuo active inductor based VCO shows a tuning frequency of 1.765GHz ~2.430GHz (31.7%), while consuming a power of 2.60 mW and phase noise of -84.15 dBc/Hz@1MHz offset. On the other hand, Liang active inductor based VCO shows a frequency range of 1.897GHz ~2.522GHz (28.28%), while consuming a power of 1.40 mW and phase noise of -80.79 dBc/Hz@1MHz offset. Comparing Figure-of-Merit (FoM), power consumption, output power and stability in performance, designed active inductor based VCOs outperform with the state-of-the-art.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 1; 57-64
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new optical frequency transfer method via fibre based on active phase noise compensation with single acousto-optic modulator
    Autorzy:
    Wang, Guoyong
    Yao, Yuanbo
    Yan, Tao
    Bian, Lang
    Meng, Yansong
    Powiązania:
    https://bibliotekanauki.pl/articles/221592.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acousto-optic modulator
    optical frequency transfer over fibre
    phase noise compensation
    relative frequency stability
    Opis:
    In this paper, we propose and experimentally demonstrate a new method for optical frequency transfer over fibre. Instead of dual acousto-optic modulators (AOMs) as adopted in the traditional fibre phase noise compensation setup, here an active fibre phase noise compensation scheme with a single acousto-optic modulator (AOM) is used. The configuration simplifies the equipment of the user end while maintaining a high-performance optical frequency transfer stability. We demonstrate an actively stabilized coherent transfer at an optical frequency of 193.55THz over 10-km spooled fibre, obtaining a relative frequency stability (Allan deviation) of 3.84 x 10-16/1 s and 4.08 x 10-18/104 s, which is improved by about 2~3 orders of magnitude in comparison with the one without any phase noise compensation that achieves a relative frequency stability of 1.81 x 10-14/1 s and 2.48 x 10-15/104 s.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 1; 115-124
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Testing Time and Frequency Fiber-Optic Link Transfer by Hardware Emulation of Acoustic-Band Optical Noise
    Autorzy:
    Lipiński, M.
    Krehlik, P.
    Śliwczyński, Ł.
    Buczek, Ł.
    Kołodziej, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/221890.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Time and Frequency fiber-optic transfer
    phase noise in optical fiber
    timing jitter
    fiber-optic transmission
    Opis:
    The low-frequency optical-signal phase noise induced by mechanical vibration of the base occurs in field-deployed fibers. Typical telecommunication data transfer is insensitive to this type of noise but the phenomenon may influence links dedicated to precise Time and Frequency (T&F) fiber-optic transfer that exploit the idea of stabilization of phase or propagation delay of the link. To measure effectiveness of suppression of acoustic noise in such a link, a dedicated measurement setup is necessary. The setup should enable to introduce a low-frequency phase corruption to the optical signal in a controllable way. In the paper, a concept of a setup in which the mechanically induced acoustic-band optical signal phase corruption is described and its own features and measured parameters are presented. Next, the experimental measurement results of the T&F transfer TFTS-2 system’s immunity as a function of the fibre-optic length vs. the acoustic-band noise are presented. Then, the dependency of the system immunity on the location of a noise source along the link is also pointed out.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 2; 309-316
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A concept of a passive radar with quadrature microwave phase discriminators
    Autorzy:
    Rutkowski, A. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/221600.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    passive radar
    instantaneous frequency measurement
    IFM
    microwave phase discriminator
    phase of noise signal
    Opis:
    Passive radar does not have its own emitter. It uses so-called signals of opportunity emitted by non-cooperative illuminators. During the detection of reflected signals, a direct signal from a non-cooperative emitter is used as the reference signal. Detection of electromagnetic echoes is, in present day radars, performed by finding the maximum of the cross ambiguity function. This function is based on the multiplication of the received signal and the reference signal. Detection of echoes by means of a quadrature microwave phase discriminator QMPD was proposed in the work as an alternative solution for ambiguity function evaluation. This discriminator carries out vectorial summing of the received and the reference signals. The summing operations in QMPD are carried out with the aid of microwave elements and without the use of expensive digital signal processors. Definitions of the phase and phase difference of the so-called simple signals and noise signals were described. A proposal of a passive radar equipped with several independent quadrature microwave phase discriminators was presented. Ideas of algorithms of object detection and of the distance-to-object estimation designed for this radar have been also sketched.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 1; 95-104
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative Analysis of the Efficiency of Detecting Some Amplitude-Phase Modulated Signals in Wireless Communication Systems
    Autorzy:
    Bondariev, Andriy P.
    Horbatyi, Ivan V.
    Maksymiv, Ivan P.
    Altunin, Sergiy I.
    Powiązania:
    https://bibliotekanauki.pl/articles/227333.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    8-QAM
    8-AMMC
    signal-to-noise ratio
    noise immunity
    phase detector
    phase locked loop
    Opis:
    This article presents the results of the research of noiseimmunity of wireless communication systems using signals that are formed on the basis of eight-position quadrature-amplitude modulation (8-QAM) and eight-position amplitude modulation of many components (8-AMMC). The research was conducted using simulation of a wireless communication system, built using a detector, implemented on the basis of a phase locked loop. The influence of phase locked loop parameters on the detection quality of these signals in the condition of the interference in the communication channel was researched, and a comparative analysis of the noise immunity of wireless communication systems using these signals was carried out.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 3; 449-453
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical Modelling of Sound Radiation from a T Junction of City Roads in Windy Conditions
    Autorzy:
    Piddubniak, O.
    Piddubniak, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/176734.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    T junction of city roads
    traffic noise propagation
    stationary phase method
    acoustic pressure
    power flow density
    Opis:
    The sound radiation from vehicles travelling on the city roads with T junction was considered. The wind effect on acoustic field was taken into account. The solution of this problem was found with the help of the integral Fourier transforms and stationary phase method as the superposition of solutions for the cases of vehicles moving along the straight roads and roads with right-angle bend. As an example, the numerical analysis of traffic noise characteristics was carried out for the T junction city road on one of streets in the town of Łódź (Poland).
    Źródło:
    Archives of Acoustics; 2016, 41, 3; 543-558
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance Enhancement of Coherent Optical OFDM System Using LMS Algorithm
    Autorzy:
    Bharti, Manisha
    Powiązania:
    https://bibliotekanauki.pl/articles/308124.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    coherent optical-orthogonal frequency division multiplexing (CO-OFDM)
    common phase error
    east means quare (LMS)
    chase noise
    Opis:
    Instability of the local oscillator causes phase noise – a phenomenon that is a disadvantage and is considered to be a major obstacle in the functioning of coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems. An attempt has been made in this paper to reduce the effects of common phase errors generated by phase noise. In this paper, a least mean square (LMS) based algorithm is proposed for estimation of phase noise. Using this proposed algorithm, the major problem of phase ambiguity caused by cycle slip is avoided and the bit error rate is greatly improved. Further, there is no requirement for modifying the frame structure of OFDM using this algorithm. A CO-OFDM system with the 8-PSK technique is used to implement the algorithm concerned. Furthermore, the algorithm, using the 8-PSK modulation technique, is analyzed and compared with the existing QPSK technique and with other algorithms. The investigations reveal that 8-PSK outperforms existing LMS algorithms using other techniques and significantly reduces the bit error rate.
    Źródło:
    Journal of Telecommunications and Information Technology; 2020, 1; 1-5
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Three dimensional optical CDMA framework with direct detection technique
    Autorzy:
    Panda, Satyasen
    Powiązania:
    https://bibliotekanauki.pl/articles/1178377.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Cross correlation (CC)
    Multiple access interference (MAI)
    Phase induced intensity noise (PIIN)
    Spectral amplitude coding optical code division multiple access (SAC-OCDMA)
    Three dimensional modified quadratic congruence/prime hop code (3-D MQC/PHC)
    Three dimensional optical code division multiple access (3-D OCDMA)
    Opis:
    In this paper, a three-dimensional (3-D) wavelength/time/space code is developed for optical code division multiple access (OCDMA) networks with direct detection technique in the receiver side. The 3-D codes are developed by mixing two-dimensional modified quadratic congruence (MQC) code and one-dimensional prime hop code (PHC) code. The encoders and decoders are constructed using fiber Bragg gratings and delay lines to minimize the bit error rate (BER). The performance analysis of the 3-D OCDMA system is based on measurement of signal to noise ratio (SNR), BER, received power and eye diagram for different numbers of simultaneous users. Also, in the analysis, various types of noises and multiple access interference (MAI) effects are considered. The received optical power is also measured at various levels of BER to analyze the effect of attenuation.
    Źródło:
    World Scientific News; 2017, 77, 2; 337-353
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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