Robust detection for the uplink of broadband wireless systems with strong ACI levels

This paper considers the uplink of wireless systems using SC-FDE schemes (Single-Carrier with Frequency-Domain Equalization) with OQPSK (Offset Quaternary Phase Shift Keying) modulations. We have an asynchronous scenario where only a coarse synchronization between mobile terminals and the base station is required. We present an iterative frequency-domain receiver for joint equalization, residual carrier synchronization and ACI (Adjacent Channel Interference) suppression. Our performance results show that the proposed receiver is able to cope with strong ACI levels, even with only a coarse synchronization between users.