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Jaya optimization algorithm (JOA) based multiuser detector over generalized-K (GK) fading channels, in the presence of impulsive noise, is presented in this paper to eliminate multiple access interference (MAI) problem. The JOA is used to implement the M-decorrelator with least squares (LS), Huber (HU), Hampel (HA) and modified Hampel (MH) estimators by minimizing the corresponding penalty functions...
In this paper, we studied the massive multiple-input multiple-output (MIMO) system performance with N antenna users and streams can be multiplexed per each user. The spectral efficiency (SE) of uplink and downlink expressions is derived for any N antenna users and these achievable using estimated channels and per user basis minimum mean squared error successive interference cancellation (MMSE-SIC)...
The direct sequence-code division multiple accesses (DS-CDMA) signals are transmitted over multipath channels that introduce fading and shadowing. Combined effect of multipath fading and shadowing along with multiple access interference (MAI) and inter-symbol interference (ISI) worsens the system performance. Further, experimental results have confirmed the presence of impulsive noise in wireless...
In the present work, we have made Monte Carlo simulations of the response of 1″ × 1″ LaCb(Ce) and 1″ × 1″ LaBn(Ce) scintillation detectors using the radioactive sources emitting two gamma rays in cascade, namely, 60Co, 94Nb, 46Sc and 24Na for different values of source-detector separation. These simulations were done using GEANT4 toolkit that include radioactive decay module and general particle source...
In integrated circuits, time resolution is preferred over voltage resolution as it offers larger operating range. Time difference amplifiers are also useful in measurement of small phase differences. A simple but high gain Time Difference Amplifier (TDA) is presented in this paper. The TDA amplifies the width of a pulse for precise measurement of time difference. The pulse width amplification is achieved...
This paper presents a new M-estimator based robust multi-user detection technique in asynchronous direct sequence-code division multiple access systems over Nakagami-m fading channels with impulsive noise. A new M-estimator, which performs well in the heavy-tailed impulsive noise, is proposed and analyzed for robustifying the detector. Average probability of error is derived and the performance of...
In this paper, the performance of cellular digital mobile radio systems is studied using differential phase shift keying (DPSK) in a frequency nonselective Rayleigh fading environment with lognormal shadowing, including the effects of (white) Gaussian noise, narrow-band impulsive noise interference (Middletonpsilas Class A model), and cochannel interference. Performance of cellular digital mobile...
A 4π sum-spin spectrometer has been designed, constructed and commissioned at the Tata Institute of Fundamental Research (TIFR), Mumbai. The spectrometer is an array of 32 conical NaI detectors of pentagonal and hexagonal cross sections. The primary role of the array is to measure the multiplicity and sum-energy of the discrete low energy gamma rays emitted in heavy-ion induced fusion-evaporation...
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