MIMO technology promises significant capacity improvements that lead to an efficient use of the radio frequency spectrum. To achieve its anticipated multiplexing gain and meet the requirements for higher data-rate services, existing broadband systems are based on OFDM or similar block-based techniques. These techniques are afflicted by poor design freedom at low redundancy, and are known to suffer badly from co-channel interference (CCI) in the presence of synchronisation errors. Non-block based approaches are scarce and do not require a guard interval; therefore can achieve higher...