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In this letter, we introduce a simple co-decoding scheme for ultra wideband (UWB) impulse radio systems impaired by multiuser interference (MUI). The proposed scheme exhibits an adaptive capability with respect to MUI degrading effects and, depending on the MUI level, it may switch from a hard-detection operating mode to a soft-detection one. So doing, the presented scheme is able to gain resistance against near–far effects. Several numerical tests support the conclusion that the presented scheme outperforms conventional ones currently planned for noise-limited UWB systems up to orders of magnitude in MUI-limited application scenarios.
Date of Publication: Aug. 2005