Rangeet Mitra

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The diffusion least mean squares (LMS) [1] algorithm gives faster convergence than the original LMS in a distributed network. Also, it outperforms other distributed LMS algorithms like spatial LMS and incremental LMS [2]. However, both LMS and diffusion-LMS are not applicable in non-linear environments where data may not be linearly separable [3]. A variant(More)
Visible light communication (VLC) is one of the main technologies driving the future 5G communication systems due to its ability to support high data rates with low power consumption, thereby facilitating high speed green communications. To further increase the capacity of VLC systems, a technique called non-orthogonal multiple access (NOMA) has been(More)
Adaptive channel equalisation is a signal processing technique to mitigate inter-symbol interference (ISI) in a time dispersive channel. To this end, the use of least mean squares (LMS) algorithm and its variants is widespread since they minimise the minimum mean squared error (MMSE) criteria by online stochastic gradient algorithms and they asymptotically(More)
The Square Contour Algorithm (SCA) solves the problem caused by possible diagonal solutions produced by the Multi-Modulus Algorithm (MMA). However, it suffers from convergence problem. In this paper, we propose a variable step size approach for improving the convergence of the SCA. Lower ISI floors are achieved by a step size controlled by a novel nonlinear(More)
In a distributed network environment, the diffusion-least mean squares (LMS) algorithm gives faster convergence than the original LMS algorithm. It has also been observed that, the diffusion-LMS generally outperforms other distributed LMS algorithms like spatial LMS and incremental LMS. However, both the original LMS and diffusion-LMS are not applicable in(More)
In this paper, we propose a probabilistic combining in amplify and forward relay protocol in Rayleigh faded wireless cooperative communication systems. This probabilistic combining works on minimum bit error rate (MBER) criterion using the closed form expression for the probability density function (pdf) of the signal to noise ratio at the output of the(More)
Underwater communications systems are being increasingly used in defence, security service, oil exploration, ocean science and in many other applications. The underwater acoustic channel is characterised by the large delay spread, Doppler shifts, limited bandwidths and time variability. The channel is also affected by additive impulsive noise, which makes(More)
Iterative algorithms are ubiquitous in the field of data mining. Widely known examples of such algorithms are the least mean square algorithm, backpropagation algorithm of neural networks etc. Our contribution in this paper is an improvement upon these iterative algorithms in terms of their respective performance metrics and robustness. This improvement is(More)