Temat: BER - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Suitable Spreading Sequences for Asynchronous MC-CDMA Systems
Autorzy:: Addad, M.
Djebbari, A.
Powiązania:: https://bibliotekanauki.pl/articles/307793.pdf
Data publikacji:: 2018
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: BER
crest factor
multiple access interference
MC-CDMA
peak-to-average power ratio
zero correlation zone
Opis:: In order to meet the demand of high data rate transmission with good quality maintained, the multi-carrier code division multiple access (MC-CDMA) technology is considered for the next generation wireless communication systems. However, their high crest factor (CF) is one of the major drawbacks of multi-carrier transmission systems. Thus, CF reduction is one of the most important research areas in MC-CDMA systems. In addition, asynchronous MC-CDMA suﬀers from the eﬀect of multiple access interference (MAI), caused by all users active in the system. Degradation of the system’s bit error rate (BER) caused by MAI must be taken into consideration as well. The aim of this paper is to provide a comparative study on the enhancement of performance of an MC-CDMA system. The spreading sequences used in CDMA play an important role in CF and interference reduction. Hence, spreading sequences should be selected to simultaneously ensure low CF and low BER values. Therefore, the eﬀect that correlation properties of sequences exert on CF values is investigated in this study. Furthermore, a numerical BER evaluation, as a function of the signal-to-noise ratio (SNR) and the number of users, is provided. The results obtained indicate that a trade-oﬀ between the two criteria is necessary to ensure good performance. It was concluded that zero correlation zone (ZCZ) sequences are the most suitable spreading sequences as far as the satisfaction of the above criteria is concerned.
Źródło:: Journal of Telecommunications and Information Technology; 2018, 3; 9-13
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Impact of Finite-Sized Aperture on the Performance of Differential Multihop DF-FSO Network
Autorzy:: Agarwal, Deepti
Yadav, Poonam
Powiązania:: https://bibliotekanauki.pl/articles/2200711.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: differencial modulation
K-distribution
Free space optics (FSO)
Average bit error rate (BER)
Decode and forward relaying
pointing error
Opis:: This paper investigates the differential binary modulation for decode-and-forward (DF) based relay-assisted free space optical (FSO) network under the effect of strong atmospheric turbulence together with misalignment error (ME). The atmospheric fading links experience K-distributed turbulence. First we derive novel closed form expression for average bit error rate (BER) and outage probability (OP) in terms of Meijer’s G function. Further, the OP of differential DF-FSO system with multiple relays is derived. We also analyze the asymptotic performance for the sake of getting the order of diversity and the coding gain. The power allotment term is utilized to examine the effect of different power allotment techniques on BER and OP. The simulation results have been used to validate the derived analytical results.
Źródło:: International Journal of Electronics and Telecommunications; 2022, 68, 4; 807--813
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Comparison of Different Wavelength Propagations over Few-Mode Fiber based on Space Division Multiplexing in Conjunction with Electrical Equalization
Autorzy:: Al-Dawoodi, A.
Fareed, A.
Masuda, T.
Ghazi, A.
Fakhrudeen, A. M.
Aljunid, S. A.
Idrus, S. Z. S.
Amphawan, A.
Powiązania:: https://bibliotekanauki.pl/articles/226328.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: few-mode fiber
nonlinear distortions
decision feedback equalizer
eye diagram
BER
Opis:: Nonlinearities in optical fibers deteriorate system performances and become a major performance-limiting issue. This article aims to investigate the compensation of nonlinear distortions in optical communication systems based on different wavelength propagations over few-mode fiber (FMF). The study adopted Space Division Multiplexing (SDM) based on decision feedback equalizer (DFE). Various transmission wavelength of the FMF system is applied to mitigate the attenuation effect on the system. In this paper, different wavelengths (780, 850 and 1550 nm) are used in SDM. Extensive simulation is performed to assess the attenuation and Bit Error Rate (BER) in each case. The results show that the wavelength of 1550 nm produces higher power and less attenuation in the transmission. Furthermore, this wavelength produces the best distance with less BER compared to 780 nm and 850 nm wavelengths. Moreover, the validations show improvement in BER and eye diagram.
Źródło:: International Journal of Electronics and Telecommunications; 2019, 65, 1; 5-10
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Efficacy of electrospun bionanofibers as fumigant pesticides in foodstuff storage
Autorzy:: Allahvaisi, Somaye
Talebi Jahromi, Khalil
Imani, Sohrab
Khanjani, Mohammad
Powiązania:: https://bibliotekanauki.pl/articles/961635.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: fumigant toxicity
nanofi ber
persistence
plodia interpunctella
storage pests
Opis:: Essential oils as alternative synthetic pesticides for pest management of foodstuffs have recently received increased attention. Controlled and slow release formulations of essential oils are used to enhance their efficiency. Two volatile essential oils of Mentha piperita L. and Salvia officinalis L. were investigated for release rate and mortality percentage by fumigant toxicity against 1st instar larvae of Plodia interpunctella. Electrospinning was used to incorporate various concentrations of essential oils in nanofibers. Th e essential oils can be released from the nanofibers for long periods of time, from several days to several weeks. Poly(lactic acid) was used as a green polymer carrier and the essential oils were incorporated into the nanofi bers (8–15v/v% PLA). Insecticidal bioassay revealed that oil-loaded nanofibers (NFOs) were more toxic than pure essential oils (PEOs) against tested larvae. Th e LC50 and LT50 of NFOs were 1.2 and 4 times, respectively, more than PEOs. Our results indicated that PEOs completely lost their insecticidal activity after 14 days, whereas at the same period, NFOs had an average of 93% mortality when applied against P. interpunctella. Therefore, it can be concluded that nanofibers improved the persistence of the oil. This study presents S. officinalis has more toxicity and M. piperita had more persistence for controlling the larvae of indian meal moth.
Źródło:: Journal of Plant Protection Research; 2017, 57, 1
1427-4345
Pojawia się w:: Journal of Plant Protection Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Studying and Modeling the Performance of the TCM-STBC Systems in the Rayleigh Channel
Autorzy:: Bendelhoum, Mohammed Sofiane
Lahcene, Mohamed Rida
Menezla, Fayssal
Elarbi, Abderraouf
Powiązania:: https://bibliotekanauki.pl/articles/1839490.pdf
Data publikacji:: 2021
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: BER
MIMO
SNR
STBC
STTC
TCM
TCM-STBC
Opis:: Multiple-input multiple-output (MIMO) systems will play an important role in future generations of wireless networks. Space-time block code (STBC) and space-time trellis code (STTC) are two techniques that may be used in multi-antenna radio systems. This paper aims, most importantly, to study the performance of STBC systems at different values of such parameters as spectral efficiency, matrix codes and constellations. A performance comparison between STBC and STTC schemes is performed. In order to show the efficiency of the system’s ability to communicate with uncoded and coded transmission structures over AWGN and Rayleigh channels, the trellis-coded modulation (TCM) is introduced. The results obtained show that the proposed TCM-STBC system model, using one and two receiving antennas, improves the performance of Rayleigh channel communication systems at 9.5 dB and 11.5 dB for a BER of 10−5.
Źródło:: Journal of Telecommunications and Information Technology; 2021, 1; 1-7
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Studying and Modeling the Performance of the TCM-STBC Systems in the Rayleigh Channel
Autorzy:: Bendelhoum, Mohammed Sofiane
Lahcene, Mohamed Rida
Menezla, Fayssal
Elarbi, Abderraouf
Powiązania:: https://bibliotekanauki.pl/articles/1839476.pdf
Data publikacji:: 2021
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: BER
MIMO
SNR
STBC
STTC
TCM
TCM-STBC
Opis:: Multiple-input multiple-output (MIMO) systems will play an important role in future generations of wireless networks. Space-time block code (STBC) and space-time trellis code (STTC) are two techniques that may be used in multi-antenna radio systems. This paper aims, most importantly, to study the performance of STBC systems at different values of such parameters as spectral efficiency, matrix codes and constellations. A performance comparison between STBC and STTC schemes is performed. In order to show the efficiency of the system’s ability to communicate with uncoded and coded transmission structures over AWGN and Rayleigh channels, the trellis-coded modulation (TCM) is introduced. The results obtained show that the proposed TCM-STBC system model, using one and two receiving antennas, improves the performance of Rayleigh channel communication systems at 9.5 dB and 11.5 dB for a BER of 10−5.
Źródło:: Journal of Telecommunications and Information Technology; 2021, 1; 1-7
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Hexagonal Photonic Crystal Fiber Behaviour as a Chromatic Dispersion Compensator of a 40 Gbps Link
Autorzy:: Betancur-Pérez, A. F.
Botero-Cadavid, J. F.
Reyes-Vera, E.
Gómez-Cardona, N.
Powiązania:: https://bibliotekanauki.pl/articles/226794.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: BER
chromatic dispersion
DWDM
photonic crystal fibers
vector finite element method
Opis:: In this paper, the capabilities of chromatic dispersion compensation of a photonic crystal fiber with a hexagonal distribution of circular air holes was investigated. The vector finite element method with scattering boundary condition was used to analyze a set of configurations of the fiber in which the distance between air holes’ centers was modified. With this method it was possible to obtain the values of chromatic dispersion and confinement factor in the C fiber band. The best suited configurations were tested in a 160 km optical link with a bit rate of 40 Gbps. The performance was evaluated by measuring the bit error rate for a set of 20 channels with channel spacing of 100 GHz. T e simulation results showed that is possible to reach values of hromatic dispersion as low as −850 ps/nm⋅km, confinement losses close to 10⁻³ dB/km and good BER results in the order of 10⁻¹⁷ for a wavelength of 1550 nm.
Źródło:: International Journal of Electronics and Telecommunications; 2017, 63, 1; 93-98
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: The modulatory effect of physical activity on APE1-mediated telomere length and stability; a narrative review
Autorzy:: Betlej, Gabriela
Kwiatkowska, Aleksandra
Bator, Ewelina
Powiązania:: https://bibliotekanauki.pl/articles/1030810.pdf
Data publikacji:: 2019
Wydawca:: Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:: APE1
BER DNA repair
oxidative stress
physical activity
telomeres
Opis:: Physical activity is associated with enhanced generation of reactive oxygen species (ROS) that, in turn, can play a dual role in the human body. Upon physiological conditions, ROS act as secondary messengers in different cell signaling pathways. In contrast, ROS overexpression can lead to oxidative stress and oxidative stress-associated harmful consequences. This exercise-induced interplay among oxidants and antioxidants can modulate numerous physiological and molecular mechanisms, for example telomere length maintenance and stability. The latter is, in turn, under strict control of oxidative stress-activated base excision repair (BER) pathway, one of the DNA repair mechanisms; and growing evidence directs attention to apurinic/ apyrimidinic endonuclease 1 (APE1), a multifunctional BER protein. Therefore, this review intends to address several issues concerning modulatory effect of exercise on APE1-mediated telomere length maintenance and redox activities.
Źródło:: Central European Journal of Sport Sciences and Medicine; 2019, 28, 4; 97-106
2300-9705
2353-2807
Pojawia się w:: Central European Journal of Sport Sciences and Medicine
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Fuzzy Model of 16PSK and 16QAM Modulation
Autorzy:: Butkiewicz, B. S.
Powiązania:: https://bibliotekanauki.pl/articles/227079.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: fuzzy modulation
BER
possibility
probability
PSK
QAM
noise
signal
Opis:: In the paper, a concept of Additive Fuzzy Noise (AFN) channel is introduced. The theoretical equations are derived for Bit Error Rate (BER) and Symbol Error Rate (SER) with some digital modulation scheme in the AFN channel. Following modulations are considered: Phase Shift Keying (16PSK), Quadrature Amplitude Modulation (16QAM). The fuzzy approach to these modulations is presented. The BER and SER values are calculated using possibility theory. The results obtained by fuzzy noise model are compared with conventional approach, where probability models of the noise are used.
Źródło:: International Journal of Electronics and Telecommunications; 2011, 57, 4; 437-442
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Peripheral challenge by Small and Medium Sized Ports (SMPs) in Multi-Port Gateway Regions: the case study of northeast of China
Autorzy:: Feng, L.
Notteboom, T.
Powiązania:: https://bibliotekanauki.pl/articles/259285.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: SMPS
BER
small and medium-sized enterprises (SMEs)
Opis:: This paper focuses on the role of small and medium-sized ports (SMPs) in enhancing the competitiveness and logistics performance of multi-port gateway regions and associated inland logistics systems. The concepts developed will be applied to the ports in the northeast of China, a multi-port gateway region around the Bohai Sea Economic Rim (BER). Port competition is analyzed by multi-variable methodology and generalized common characteristics of SMPs compared to gateway ports, and the similarities of SMPs and SMEs are also compared. Later in this paper, we analyze the role of a SMP in such region in different variables: (a) cargo volume and market share; (b) international connectivity; (c) relative cluster position; (d) port city and hinterland connection; and (e) logistics and distribution function. The five-dimension analysis combined with in-depth cases study of typical Yingkou port describes a profile of SMPs in the BER and provides future study possibility for more SMPs cases worldwide.
Źródło:: Polish Maritime Research; 2013, S 1; 55-66
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Comparison of traffic performance of QPSK and 16-QAM modulation techniques for OFDM system
Autorzy:: Islam, I.
Hossain, S.
Powiązania:: https://bibliotekanauki.pl/articles/308854.pdf
Data publikacji:: 2005
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: OFDM
QPSK
16-QAM
IFFT
frequency spectrum
PAPR
BER
Opis:: Orthogonal frequency division multiplexing (OFDM) provides better spectral efficiency than frequency division multiplexing (FDM), while maintaining orthogonal relation between carriers; hence traffic is better carried by OFDM than FDM within the same spectrum. This paper reveals a comparison of spectral efficiency, performance of communication system in context of bit error rate (BER) for the same information rate and peak to average power ratio (PAPR) of quadrature amplitude shift keying (QPSK) and 16-quadrature amplitude modulation (16-QAM) technique.
Źródło:: Journal of Telecommunications and Information Technology; 2005, 1; 147-152
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Bibliografia doc. dr hab. Andrzeja Bera
Bibliography of Professor Andrzej Ber
Autorzy:: Jastrzębska-Ber, M.
Powiązania:: https://bibliotekanauki.pl/articles/2063170.pdf
Data publikacji:: 2007
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: Ber Andrzej
Źródło:: Biuletyn Państwowego Instytutu Geologicznego; 2007, 425; 7-18
0867-6143
Pojawia się w:: Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Hardware Implementation of MISO on Orthogonal Frequency Division Multiplexing Platform with the Help of Alamouti Algorithm
Autorzy:: Kilaru, S.
Powiązania:: https://bibliotekanauki.pl/articles/226220.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: MISO
SISO
FPGA
Xilinx
BER
SNR
Alamouti
LTE
Opis:: Many software based OFDM techniques were proposed from last half decade to improve the performance of the system. This paper tried to implement the same with Hardwar implementation. We created Hardware based MISO platform with OFDM. We implemented Alamouti algorithm on this test bed. The test bed is implemented with the help of Field Programmable Gate Array (FPGA). The test bed is functionalized with the help of FPGA through Xilinx based system generator for DSP. In this paper we considered the 2×1 MISO implementation with Alamouti algorithm. The simulation results showed that BER and SNR are considerably high for MISO than SISO. The results also proved that proposed OFDM based Alamouti implementation for MISO is excellent in all performance criterions.
Źródło:: International Journal of Electronics and Telecommunications; 2017, 63, 2; 137-143
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Oczy wielkiej floty -- Beriew Be-4 (KOR-2)
Autorzy:: Kiński, Andrzej.
Zablocki, Vladimir.
Powiązania:: Nowa Technika Wojskowa 2001, nr 1, s. 33-36
Data publikacji:: 2001
Tematy:: Ber'ev BE-4 (KOR-2) (samolot) budowa i konstrukcje projekty ZSRR 1939-1945 r.
Samoloty lotnictwa morskiego ZSRR 1914-1918 r.
Wodnosamoloty projekty ZSRR 1914-1918 r.
Marynarka wojenna rozwój ZSRR 1914-1945 r.
Opis:: Fot.
Dostawca treści:: Bibliografia CBW

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Skocz do pozycji: 15.

Tytuł:: Bacterial DNA repair genes and their eukaryotic homologues: 1. Mutations in genes involved in base excision repair (BER) and DNA-end processors and their implication in mutagenesis and human disease
Autorzy:: Krwawicz, Joanna
Arczewska, Katarzyna
Speina, Elzbieta
Maciejewska, Agnieszka
Grzesiuk, Elzbieta
Powiązania:: https://bibliotekanauki.pl/articles/1040919.pdf
Data publikacji:: 2007
Wydawca:: Polskie Towarzystwo Biochemiczne
Tematy:: mutagenesis
AP endonuclease
SSBR
DNA damage
protein interaction
BER
DNA repair; glycosylase
SSB
Opis:: Base excision repair (BER) pathway executed by a complex network of proteins is the major system responsible for the removal of damaged DNA bases and repair of DNA single strand breaks (SSBs) generated by environmental agents, such as certain cancer therapies, or arising spontaneously during cellular metabolism. Both modified DNA bases and SSBs with ends other than 3'-OH and 5'-P are repaired either by replacement of a single or of more nucleotides in the processes called short-patch BER (SP-BER) or long-patch BER (LP-BER), respectively. In contrast to Escherichia coli cells, in human ones, the two BER sub-pathways are operated by different sets of proteins. In this review the selection between SP- and LP-BER and mutations in BER and end-processors genes and their contribution to bacterial mutagenesis and human diseases are considered.
Źródło:: Acta Biochimica Polonica; 2007, 54, 3; 413-434
0001-527X
Pojawia się w:: Acta Biochimica Polonica
Dostawca treści:: Biblioteka Nauki

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