Synchronization for an efficient multiuser filtered multitone receiver

Abstract

We consider the synchronization problem in an uplink multiuser filtered multitone (FMT) modulated system. It differs from OFDMA in the deployment of sub-channel shaping filters. User multiplexing is still accomplished by partitioning the tones among the active users. Users are asynchronous such that the received signals experience independent time offsets, carrier frequency offsets, and multipath fading. We consider the synchronization problem in a novel multiuser receiver that comprises two efficiently implemented fractionally spaced analysis filter banks. In this receiver time/frequency compensation can be jointly done for all users. Despite its lower complexity we show that this receiver approaches the performance of single user FMT.