O³-Based Linear Decorrelating Detector for Asynchronous UWB Systems Over Multipath Fading Channels

In this paper, a convenient signaling scheme, termed orthogonal on-off ultra-wideband (O³UWB), along with a simple one-shot linear decorrelating detector (LDD) and a Rake bank, is proposed. This scheme is useful for doing multi-user detection because temporally adjacent bits in receiver signals from different users are decoupled using on- off signaling. This mechanism also leads to one-shot detection that overcomes the main disadvantage, long detection delay, of the conventional LDD. Since multipath fading still significantly degrades UWB system performance, the Rake bank is included to recover multipath diversity gain. Numerical analysis and simulation results show that the O³UWB LDD-Rake receiver scheme indeed offers good near-far resistance and provides diversity gain in multipath fading UWB channels.