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

Abstract

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 O3UWB LDD scheme over fading channels, and the proposed receiver still demonstrates a better near–far-resistant property than a conventional UWB receiver.