The document discusses two astronomical objects, the Orion Nebulae and Mount Marapi. The Orion Nebulae is a stellar nursery located near the Orion's Belt asterism. Mount Marapi is a volcano located on the island of Sumatra in Indonesia.
Информационный бюллетень "Московский учитель" №4 (6). Тема номера "Фундаментальные понятия для реальной жизни". Номер посвящен III Съезду учителей Москвы, который пройдет 4 сентября 2015 года в образовательном комплексе "Воробьевы горы"
Krótka prezentacja o e-portfoliach - narzędziach służących do prezentacji dorobku intelektualnego oraz zawodowego, także wykorzystywanych w szkołach i na uczelniach
Информационный бюллетень "Московский учитель" №4 (6). Тема номера "Фундаментальные понятия для реальной жизни". Номер посвящен III Съезду учителей Москвы, который пройдет 4 сентября 2015 года в образовательном комплексе "Воробьевы горы"
Krótka prezentacja o e-portfoliach - narzędziach służących do prezentacji dorobku intelektualnego oraz zawodowego, także wykorzystywanych w szkołach i na uczelniach
Wavelet Packet based Multicarrier Modulation for Cognitive UWB SystemsCSCJournals
Orthogonal frequency division multiplexing (OFDM) is a multi-carrier modulation (MCM) scheme where the sub carriers are orthogonal waves. The main advantages of OFDM are robustness against multi-path fading, frequency selective fading, narrowband interference, and efficient use of spectrum. Recently it is proved that MCM system optimization can be achieved by applying wavelet bases instead of conventional fourier bases. Wavelet packet based MCM (WPMCM) systems have overall the same capabilities as OFDM systems with some improved features. In this research the literature and analytic schemes of WPMCM system is addressed, a wavelet packet based cognitive ultra wideband (UWB) transceiver is proposed, and performance analysis of WPMCM in different wireless multipath channels is investigated. Simulation results show a significant enhancement in terms of BER, spectral efficiency and side-lobes suppression comparing to conventional OFDM.
This technology lets Internet connectivity to RF powered devices.Rf powered devices are those devices which charge their batteries from surrounding Radio Frequency signals present. These devices can communicate with other devices using backscatter technique.
Wavelet Packet based Multicarrier Modulation for Cognitive UWB SystemsCSCJournals
Orthogonal frequency division multiplexing (OFDM) is a multi-carrier modulation (MCM) scheme where the sub carriers are orthogonal waves. The main advantages of OFDM are robustness against multi-path fading, frequency selective fading, narrowband interference, and efficient use of spectrum. Recently it is proved that MCM system optimization can be achieved by applying wavelet bases instead of conventional fourier bases. Wavelet packet based MCM (WPMCM) systems have overall the same capabilities as OFDM systems with some improved features. In this research the literature and analytic schemes of WPMCM system is addressed, a wavelet packet based cognitive ultra wideband (UWB) transceiver is proposed, and performance analysis of WPMCM in different wireless multipath channels is investigated. Simulation results show a significant enhancement in terms of BER, spectral efficiency and side-lobes suppression comparing to conventional OFDM.
This technology lets Internet connectivity to RF powered devices.Rf powered devices are those devices which charge their batteries from surrounding Radio Frequency signals present. These devices can communicate with other devices using backscatter technique.