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A novel heuristic algorithm for multiuser detection in synchronous CDMA wireless sensor networks

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3 Author(s)
Gil-Lopez, S. ; TELECOM Unit, TECNALIA-Robotiker, Zamudio, Spain ; Del Ser, J. ; Olabarrieta, I.

This paper introduces a novel heuristic algorithm for N-user detection in synchronous CDMA multiple access networks. In such systems, the performance of the conventional single-user detection technique (i.e. a rake receiver compounded by a set of matched filters) is clearly bounded by the well-known multiple access interference (MAI). To avoid this limitation, the optimum maximum likelihood (ML) detection scheme seeks the best solution by performing an exhaustive search over the entire set of N-dimensional information vectors, which entails a computational complexity exponentially increasing with the number of nodes N. The heuristic procedure presented in this manuscript provides a set of near-optimum candidate vectors at a dramatically lower computational complexity. Intensive computer simulations show that our heuristic proposal outperforms the conventional single-user rake receiver, while getting close to the optimum albeit complex ML detector.

Published in:

Ultra Modern Telecommunications & Workshops, 2009. ICUMT '09. International Conference on

Date of Conference:

12-14 Oct. 2009