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Ultra-wideband (UWB) communications can be achieved under non-line-of-sight (NLOS) propagation conditions at distances over 100 m using a single carefully designed and located microwave reflector in conjunction with a multi-carrier modulation technique such as orthogonal frequency-division multiplexing (OFDM) that is less sensitive to multipath effects than single-carrier modulation. One key factor...
Recently, MIMO techniques have been using in active radars,and become a hot topic in radar field, where they improve the performance of detection and parameters estimation greatly. On estimates of direction-of-arrival (DOA) in active radars, generally elements of the receive array were closely spaced to enable direction finding measurements. However, in order to obtain angular diversity, all elements...
Three applications in wireless networks where model-free stochastic learning is applicable, are discussed. The learning based optimization problems are formulated and simulation results are presented. Some open issues are also discussed.
This paper investigates the effective gain of antennas in indoor channels. A metric called instantaneous effective gain is proposed, and a multiple-cluster 3D channel model is used to facilitate the proposed antenna effective gain. In the multiple-cluster channel model, Laplacian and double exponential distribution are utilized to model azimuth and elevation signal power distribution respectively,...
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