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This letter presents a new receiver for-ary transmission, where all receiver blocks are embedded in an iterative structure. Packet data transmission in global systems for mobile communications (GSM) and enhanced data rates for global evolution (EDGE) are considered as examples. A low-complexity soft-insoft-out detector for EDGE is introduced and its modification suitable for iterative detection is derived. Application of iterative detection and channel estimation techniques in GSM/EDGE shows a significant performance enhancement. Additional improvement may be obtained if the iterative processing is applied to packet retransmission schemes.

SUMMARYIn 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 comprising 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 Enhanced Data rates for Global Evolution (EDGE). 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.

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