Temat: multicarrier modulation - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Stanowisko do badania i pomiarów parametrów transmicji wielonośnej z prekomensacją przeników zdalnych
Measurement system for parameters evaluation of multi tone modulation with far-end crosstalk precompensation
Autorzy:: Turcza, P.
Powiązania:: https://bibliotekanauki.pl/articles/156182.pdf
Data publikacji:: 2007
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: modulacja wielonośna
modem ADSL
przeniki zdalne
multicarrier modulation
ADSL modem
far-end crosstalk
Opis:: Artykuł prezentuje wykonane stanowisko do badania i pomiarów parametrów transmisji wektorowej w systemie ADSL. Pozwala ono na sprzętową realizację transmisji wektorowej w kierunku od centrali do abonenta z użyciem 4 linii ADSL. Taki typ transmisji pozwala na prekompensację przeników występujących podczas transmisji w kablu wieloparowym.
The paper describes system for evaluation and parameters measurement of vectorized ADSL transmission. Downstream transmission using 4 lines in vectored mode in ADSL standart is supported. Vectored transmission enables precompensation of crosstalk occuring between neighboring pairs in data cable.
Źródło:: Pomiary Automatyka Kontrola; 2007, R. 53, nr 9 bis, 9 bis; 146-149
0032-4140
Pojawia się w:: Pomiary Automatyka Kontrola
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Pilot Based MMSE Channel Estimation for Spatial Modulated OFDM Systems
Autorzy:: Soman, Anetha Mary
Nakkeeran, R.
Shinu, Mathew John
Powiązania:: https://bibliotekanauki.pl/articles/2055222.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: MIMO
multicarrier modulation
spatial modulation
channel estimation
channel model
interpolation
Opis:: Due to the multifold growth in demands of multimedia services and mobile data, the request for increased channel capacity in mobile and wireless communication has been quickly increasing. Developing a wireless system with more spectral efficiency under varying channel condition is a key challenge to provide more bit rates with limited spectrum. Multiple Input Multiple Output(MIMO) system with Orthogonal Frequency Division Multiplexing (OFDM) gives higher gain by using the direct and the reflected signals, thus facilitating the transmission at high data rate. An integration of Spatial Modulation (SM) with OFDM (SM OFDM) is a newly evolved transmission technique and has been suggested as a replacement for MIMO -OFDM transmission. In practical scenarios, channel estimation is significant for detecting transmitted data coherently. This paper proposes pilot based, Minimum Mean Square Error (MMSE) channel estimation for the SM OFDM communication system. We have focused on analyzing Symbol Error Rate (SER) and Mean Square error (MSE) under Rayleigh channel employing International Telecommunication Union (ITU) specified Vehicular model of Pilot based MMSE channel estimator using windowed Discrete Fourier Transform (DFT) and MMSE weighting function. Simulation output shows that proposed estimator’s SER performance lies close to that of the MMSE optimal estimator in minimizing aliasing error and suppressing channel noise by using frequency domain data windowing and time domain weighting function. Usage of the Hanning window eliminates error floor and has a compact side lobe level compared to Hamming window and Rectangular window. Hanning window has a larger MSE at low Signal to Noise Ratio (SNR) values and decreases with high SNR values. It is concluded that data windowing technique can minimize the side lobe level and accordingly minimize channel estimation error when interpolation is done. MMSE weighting suppresses channel noise and improves estimation performance. Since Inverse Discrete Fourier Transform(IDFT)/DFT transforms can be implemented with fast algorithms Inverse Fast Fourier Transform( IFFT)/Fast Fourier Transform(FFT) computational complexity can be remarkably reduced.
Źródło:: International Journal of Electronics and Telecommunications; 2021, 67, 4; 685--691
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Single-source three-phase switched-capacitor-based MLI
Autorzy:: Jena, Kasinath
Gupta, Krishna Kumar
Bhatnagar, Pallavee
Jain, Sanjay K.
Stala, Robert
Waradzyn, Zbigniew
Piróg, Stanisław
Penczek, Adam
Mondzik, Andrzej
Skała, Aleksander
Powiązania:: https://bibliotekanauki.pl/articles/2175942.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: multilevel inverter
switched capacitor
multicarrier pulse width modulation
cost function
ANPC inverter
Opis:: This article proposes a novel three-phase inverter based on the concept of switched capacitors (SCs), which uses a single DC source. A three-phase, seven-level line-to-line output voltage waveform is synthesised by the proposed topology, which includes eight switches, two capacitors, and one diode per phase leg. The proposed topology offers advantages in terms of inherent voltage gain, lower voltage stresses on power switches, and a reduced number of switching components. Additionally, the switched capacitors are self-balanced, thereby eliminating the need for a separate balancing circuit. The proposed structure and its operating principle, the self-balancing mechanism of the capacitors, and the control strategy are all thoroughly explained in the article. The proposed topology has also been compared with some recent SC topologies. Lastly, the proposed topology has been shown to be feasible through simulation and experimentation.
Źródło:: Power Electronics and Drives; 2022, 7, 42; 197--209
2451-0262
2543-4292
Pojawia się w:: Power Electronics and Drives
Dostawca treści:: Biblioteka Nauki

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