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arXiv · 1301.0097

Set-Membership Adaptive Algorithms based on Time-Varying Error Bounds for Interference Suppression

Rodrigo C. de Lamare·Paulo S. R. Diniz
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Abstract

This work presents set-membership adaptive algorithms based on time-varying error bounds for CDMA interference suppression. We introduce a modified family of set-membership adaptive algorithms for parameter estimation with time-varying error bounds. The algorithms considered include modified versions of the set-membership normalized least mean squares (SM-NLMS), the affine projection (SM-AP) and the bounding ellipsoidal adaptive constrained (BEACON) recursive least-squares technique. The important issue of error bound specification is addressed in a new framework that takes into account parameter estimation dependency, multi-access and inter-symbol interference for DS-CDMA communications. An algorithm for tracking and estimating the interference power is proposed and analyzed. This algorithm is then incorporated into the proposed time-varying error bound mechanisms. Computer simulations show that the proposed algorithms are capable of outperforming previously reported techniques with a significantly lower number of parameter updates and a reduced risk of overbounding or underbounding.

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Rodrigo C. de Lamare, Paulo S. R. Diniz. 2013-01-01. Set-Membership Adaptive Algorithms based on Time-Varying Error Bounds for Interference Suppression. https://arxiv.org/abs/1301.0097

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