A non-coherent equaliser receiver structure for DECT-type systems

A new structure for a non-coherent equaliser receiver applicable to the DECT-type systems is derived, where the equaliser algorithm takes into account the receiver non-linearities. It employs a modified channel estimation procedure suitable for differential detection. The outputs of the differential detector itself are then fed to a simple 2-state Viterbi algorithm which uses the modified channel estimates. Performance results are given for the new receiver which show that it can yield significant improvements with respect to standard non-coherent receivers in dispersive channels. At the same time, however, it will operate with receiver frequency offsets two orders of magnitude greater than a standard coherent detector equaliser structure (similar to that found in GSM) and is much less sensitive to the variations in the modulation index. In addition, performance limits of the basic structure are discussed and techniques for further improvement of the performance are considered