Most research on Distributed Space-Time Block
Coding (D-STBC) has so far focused on the case of 2 relay nodes
and assumed that the relay nodes are perfectly synchronised
at the symbol level. This paper applies STBC to 4-relaynode
systems under quasi-synchronisation and derives a new
detector based on parallel interference cancellation, which proves
to be very effective in suppressing the impact of imperfect
synchronisation.