Performance Evaluation of Decoupled Space-Time Delayed Decision-Feedback Sequence Estimation in Mobile Radio Environments
J. C. M. Mota, André L. F. de Almeida, Carlos Estêvão Rolim Fernandes, Francisco R. P. Cavalcanti · Anais do 2002 International Telecommunications Symposium · 2002
This work aims at investigating the performance of a decoupled space-time processing structure based on a delayed decision-feedback sequence esti mator (D-ST-DDFSE), in the context of the enhanced data rates for GSM evolution (EDGE) system.The main idea in using decoupled space-time processing is to separate co-channel interference (CCI) reduction from inter-symbol interference (ISI) suppression.Consequently, all degrees of freedom of a space-time front-end are dedicated to treat CCI, leaving ISI to be suppressed by a temporal equalizer.Due to the 8-PSK modulation and the large delay spread values compared to the symbol period, optimum detection becomes too complex in the EDGE system, which makes DDFSE a promising scheme for ISI suppression.The performance of D-ST-DDFSE is analyzed through link-level simulations under the context of COST 259 channel models for Typical Urban (TU) and Bad Urban (BU) propagation scenarios.Improved performance of this D-ST technique over a conventi onal space-time equalizer is observed.