Browsing by Author "Gunaratne, TK"

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    Real-time 2-d fir trapezoidal digital filters for 2.4 ghz aperture receiver applications
    (IEEE, 2018-05) Ariyarathna, V; Coutinho, VA; Pulipati, S; Madanayake, A; Wijesekara, RT; Edussooriya, CUS; Bruton, LT; Gunaratne, TK; Cintra, RJ; Chathuranga, D
    This paper presents the implementation of a twodimensional (2-D) finite-impulse-response (FIR) trapezoidal filter based beamforming array receiver. A 2.4 GHz 16-element receivemode IQ array is designed and used for physically measuring the beam patterns corresponding to 2-D FIR trapezoidal filters. The 16-element beamformer is implemented using the reconfigurable open architecture computing hardware version-2 (ROACH-2) field programmable gate array (FPGA) platform to perform analog to digital conversion and digital signal processing. The 2-D FIR trapezoidal filter is designed as a 16-spatial input 32- tap filter and is implemented targeting the ROACH-2’s Xilinx Virtex 6 (sx475t) FPGA chip as a filter-and-sum architecture. The receiver array is precisely rotated (keeping the transmitter fixed) to digitally measure the received energy by integrating the instantaneous power of the output of the 2-D FIR trapezoidal filter for each angle of reception. The main lobe of the measured beam pattern is well aligned with the simulated beam pattern, and the highest measured side-lobe level is −17.8 dB.