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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)
—Recently we have proposed a maximum-likelihood iterative algorithm for estimation of parameters of the Nakagami-m distribution. This technique performs better than state of art estimation techniques for this distribution. This could be of particular use in low-data/block based estimation problems. In these scenarios, the estimator should be able to give(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)
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)
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)
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)
The recently proposed improved multi-stage clustering (IMSC) based blind equalisation algorithm in [1] gave significant performance improvement as compared to its state of the art counterparts. In that work, the performance was considered over a frequency-selective single input single output (SISO) additive white Gaussian noise (AWGN) channel. The practice(More)
The diffusion based distributed learning approaches have been found to be a viable solution for learning over linearly separable datasets over a network. However, approaches till date are suitable for linearly separable datasets and need to be extended to scenarios in which we need to learn a non-linearity. In such scenarios, the recently proposed diffusion(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)