A widely linear LMS algorithm for MAI suppression for DS-CDMA

TitleA widely linear LMS algorithm for MAI suppression for DS-CDMA
Publication TypeConference Paper
Year of Publication2003
AuthorsSchober, R., W. H. Gerstacker, and L. Lampe
Conference NameCommunications, 2003. ICC '03. IEEE International Conference on
Pagination2520 - 2525 vol.4
Date Publishedmay.
Keywordscode division multiple access, computational complexity, direct sequence code division multiple access, DS-CDMA, filtering theory, interference suppression, least mean square algorithm, least mean squares methods, MAI suppression, minimum mean square error filter, MMSE filter, multiple access interference, SINR, spread spectrum communication, steady-state signal-to-interference-plus-noise ratio, widely linear LMS algorithm

In this paper, a novel data-aided stochastic gradient algorithm for adjustment of the widely linear (WL) minimum mean-squared error (MMSE) filter for multiple access interference (MAI) suppression for direct-sequence code-division multiple access (DS-CDMA) is introduced and analyzed. We give analytical expressions for the steady-state signal-to-interference-plus-noise ratio (SINR) of the proposed WL least-mean-square (LMS) algorithm, and we also investigate its speed of convergence. Both analytical considerations and simulations show in good agreement the superiority of the novel WL adaptive algorithm. Nevertheless, the computational complexity of the proposed algorithm is lower than that of the linear LMS algorithm.


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