Wireless broadband transmission channels usually have time-domain-sparse properties, and the reconstruction of these channels using a greedy search-based orthogonal matching pursuit (OMP) algorithm can effectively improve channel estimation performance while decreasing the length of the reference signal. In this research, the improved OMP and SOMP algorithms for compressed-sensing (CS)-based channel estimation are proposed for single-carrier frequency domain equalization (SC-FDE) systems, which, in comparison with conventional algorithms, calculate the path gain after obtaining the path delay and updating the observation matrices. The reliability of the communication system is further enhanced because the channel path gain is calculated using longer observation vectors, which lowers the Cramér–Rao lower bound (CRLB) and results in better channel estimation performance. The developed method can also be applied to time-domain-synchronous OFDM (TDS-OFDM) systems, and it is applicable to the improvement of other matching pursuit algorithms.
Yuli Triestini, Bambang Nugroho, Rima H.S. Siburian
Changes in forest management policies by applying the Self-Assesment system, and online SI-PUHH are expected to affect the realization of PNBP for West Papua Province. How the PNBP Trends after implementing the policy in West Papua Province is a problem that will be answerd through this research. The study aims to determine trends and forecasting of PNBP Forestry Sector after the implementation of online self-assessment and SI-PUHH policies in West Papua Province. The realization of PNBP of West Papua Province originating from PSDH and DR during 2010 – 2018 shows an increasing trend even in certain years of decline. Fluctuations occur as a result of the enforcement of the self-assessment and SI-PUHH Online policies which often experience changes, especially the use of certain applications that are erquired.
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ABSTRACTThin films of Si/Cs/O nanoclusters have been synthesized by the technique of supersaturated thermal vaporization of Si and Cs in an oxygen background gas. These films, which were deposited onto conducting or semiconducting substrates, exhibit negative electron affinity (NEA) as evidenced by ultraviolet photoemission spectroscopy (UPS). Photo and field electron emission properties of these nanocluster films were investigated with photo-electron emission microscopy (PEEM), field electron emission microscopy (FEEM), and current-voltage measurements. Flat cathodes covered with thin films of Si/Cs/O nanoclusters exhibited high current outputs and low turn-on fields. The films' NEA is unaffected by air exposure and is stable to high temperature annealing (550 TC). A field emission display unit with a simple diode structure containing a flat cathode coated with a patterned thin film of Si/Cs/O nanoclusters has also been built to demonstrate the potential application of this material in cold cathode electron emitting devices, particularly field emission flat panel displays.