Reduced Complexity EGPRS Equalizer for Base Station DSP
In this paper we present an iterative receiver concept that improves the radio link performance of TDMA mobile communication systems. We consider sub-optimal receiver structures comprised of channel estimator, detector and channel decoder, where the performance is improved by iterative data processing among the receiver blocks. As a practical example we consider packet data transmission in GSM and EDGE (Enhanced Data rates for Global Evolution). Low-complexity soft-in-soft-out (SISO) equalizers for EDGE are introduced and its modifications suitable for iterative detection in EDGE are derived. Application of iterative detection and channel estimation techniques in GSM/EDGE shows a significant performance improvement. Furthermore, we show that retransmission schemes specified for EDGE also benefit from iterative data processing.