Orthogonal on-off-based near-far-resistant detection with diversity technique in UWB systems

A convenient signalling scheme, called orthogonal on-off (O³), together with a simple one-shot linear decorrelating detector (LDD) and a RAKE bank, is adopted in asynchronous ultra- wideband (UWB) systems. The performance of the proposed system is evaluated over multipath fading channels. This investigation also analyses mathematically the effect of the maximal-ratio combining diversity technique on the O³UWB LDD performance over lognormal fading channels. The analytical and simulation results indicate that the diversity technique significantly improves the performance of the O UWB LDD scheme over fading channels, and the proposed receiver still demonstrates a better near-far-resistant property than a conventional UWB receiver.