Design of an Interference-Resistant Equalizer for EDGE Cellular Radio Systems

Abstract
An adaptive receiver based on Delayed Decision Feedback Sequence Estimation (DDFSE) for the EDGE (Enhanced Data Rates for GSM Evolution) system with 8PSK modulation is presented in this paper. The issues involved in pre-conditioning the signal for equalization are discussed, as well as, the design of the whitening matched filter (WMF). A special emphasis is placed on a simple structure suitable for implementation, which is robust enough to pass Third Generation Partnership Program (3GPP) standard compliance tests, including co- and adjacent-channel requirements. In addition, the optimization of the channel estimates and the computation of soft-output decisions crucial to optimize the performance of the complete chain are discussed. Results of performance simulations for various coding schemes, propagation channels and environments (reference sensitivity, adjacent-channel interference) are presented.

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