Adaptive BLAST-type decision-feedback equalizers for DS-CDMA systems

Authors:
Constantinos Rizogiannis;Eleftherios Kofidis;Athanasios A. Rontogiannis;Sergios Theodoridis
Affiliations:
Department of Informatics and Telecommunications, University of Athens, Panepistimioupolis, 157 84 Athens, Greece;Department of Statistics and Insurance Science, University of Piraeus, 185 34 Piraeus, Greece;Institute for Space Applications and Remote Sensing, National Observatory of Athens, 152 36 P. Penteli, Greece;Department of Informatics and Telecommunications, University of Athens, Panepistimioupolis, 157 84 Athens, Greece
Venue:
Signal Processing
Year:
2012

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Abstract

In this paper, we propose two new adaptive equalization algorithms for direct sequence code division multiple access (DS-CDMA) systems operating over time-varying and frequency selective channels. The equalization schemes consist of a number of serially connected stages and detect users in an ordered manner, applying a decision feedback equalizer (DFE) at each stage. Both the equalizer filters and the order in which the users are extracted are updated in a recursive least squares (RLS) manner, efficiently realized through time- and order-update recursions. V-BLAST detection ordering is implemented, that is, the stronger signal is extracted first so that the weaker users can be more easily detected. The spreading codes are unavailable at the receiver of the first scheme, whereas the second algorithm employs the RAKE receiver concept, incorporating knowledge of the spreading sequences to offer performance improvement. The bit error rate (BER) performance of the equalizers is evaluated via simulations, in both mild and severe near-far environments. Their superiority over existing techniques is demonstrated.