Current Issue : July - September Volume : 2016 Issue Number : 3 Articles : 4 Articles
In Passive Radar System, obtaining the mixed weak object signal against the super power signal (jamming) is still a challenging\ntask. In this paper, a novel framework based on Passive Radar System is designed for weak object signal separation. Firstly, we\npropose an Interference Cancellation algorithm (IC-algorithm) to extract the mixed weak object signals from the strong jamming.\nThen, an improved FastICA algorithm with ...
A Multichannel Synthetic Aperture Radar (M-SAR) exploiting an antenna nulling based Electronic Counter-Counter Measures\n(ECCM) technique shall be able to cancel the effects of noise-like interferences over the collected SAR data. Since SAR systems\noften work with wide bandwidths to provide high resolution images, ECCM technique must account for the presence of wideband\ninterference signal. In this paper we consider a wideband antenna nulling technique based on space-frequency adaptive nulling\nand we propose an integration of the WB antenna nulling scheme within the focusing algorithm for M-SAR systems, thus allowing\na fusion between ECCM and usual SAR processing steps. The computational cost of the integrated algorithm is compared with\nthe cost of more traditional sequence of the wideband extension of the Side-Lobe Canceller and the focusing operation, to show\nthe computational feasibility of the proposed integrated algorithm. The possibility to perform suboptimally the space-frequency\nadaptive nulling is also considered...
The emerging large-scale/massive multi-input multioutput (MIMO) system combined with orthogonal frequency division\nmultiplexing (OFDM) is considered a key technology for its advantage of improving the spectral efficiency. In this paper,\nwe introduce an iterative detection algorithm for uplink large-scale multiuser MIMO-OFDM communication systems. We\ndesign a Main-Branch structure iterative turbo detector using the Approximate Message Passing algorithm simplified by linear\napproximation (AMP-LA) and using theMean Square Error (MSE) criterion to calculate the correlation coefficients between main\ndetector and branch detector for the given iteration. The complexity of our method is compared with other detection algorithms.\nThe simulation results show that our scheme can achieve better performance than the conventional detection methods and have\nthe acceptable complexity....
The paper examines the antenna model for the transient analysis of electromagnetic field coupling to straight wire configurations\nburied in a lossy half-space. The wire antenna theory (AT) model is implemented directly in the time domain and it is based\non the corresponding space-time Pocklington integro differential equation. The solution of the Pocklington equation is carried\nout analytically. The obtained results are compared against the results calculated via the transmission line (TL) approach. The TL\napproach is based on the telegrapher�s equations, which are solved using the modified transmission line method (MTLM) and\nFinite Difference Time Domain (FDTD) technique, respectively. Some illustrative computational examples for buried straight wire\nscatterer and horizontal grounding electrode are given throughout this work....
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