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In this paper, a custom software defined radio that implements a smart antenna array is used in the task of real-time beamforming. Specific beamforming algorithms are implemented in FPGA, remotely controlled by a computer host. The antenna array is mounted in a metallic cylinder and tested in anechoic chamber. Experimental measurements highlight the efficiency of the algorithms implementation. Moreover,...
This paper is devoted to two classical sparse problems in array processing: Channel estimation and DOA estimation. It is shown after some background and some recent results in ℓ0 optimization how this latter can be used, at the same computational cost, in order to obtain improvement in comparison with ℓ1 optimization for sparse estimation.
This paper presents an FPGA implementation of the front-end of a single-carrier coherent optical receiver for optical networks. The receiver is based on a number of spectral-efficient techniques, such as polarization multiplexing and 16-QAM modulation formats. The FPGA implementation was tested with received traces (time series) obtained from optical simulation for scenarios that operate with channel...
Widely Linear Processing (WLP), proposed by Brown and Crane in 1969, has recently received a great deal of attention, in particular due to its potential of application in some important problems in array processing. The present work investigates the implementation of the linearly constrained minimum variance (LCMV) algorithm proposed by Frost in the context of widely and strictly linear processing...
A new approach for channel estimation, based on the concept of compressive sensing is presented for situations where signals are DSSS transmitted. Compressive sensing encompasses elegant mathematical background where the information of the sparse characteristic of the signal is used to create an efficient representation of it using fewer measurements than required by the Shannon-Nyquist criterion...
This paper presents and describes a low-cost hardware implementation of smart antenna based on FPGA. Unlike systems using high-cost devices, the case herein uses a low-end FPGA for beamforming algorithm implementation, enabling smart antenna applications in practical and commercial problems, as for instance interference mitigation. The low-cost smart antenna array underwent two different types of...
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