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The symbol-by-symbol differential detection scheme,originally employed to detect differential spacetime block coded(DSTBC) ultra-wideband(UWB) signal in previous work,su?ers from a performance degradation compared with coherent detection.In this paper,a noncoherent multiple symbol detection(MSD) scheme is proposed to enhance the performance of DSTBC-UWB system.After the signal model of DSTBC-UWB is analyzed,the optimal maximum likelihood(ML) MSD is derived and then a suboptimal ML-MSD is obtained by channel approximating.However,exhaustive search based MSD is impractical in DSTBC-UWB systems since its complexity increases exponentially with observation window size.To decrease the computational complexity,the decision-feedback(DF) scheme is introduced to MSD.The resultant DF-MSD yields reasonable complexity and solid performance improvement.
The symbol-by-symbol differential detection scheme, originally employed to detect differential space time block coded (DSTBC) ultra-wideband (UWB) signal in previous work, su® ers from a performance degradation compared with coherent detection. In this paper, a noncoherent multiple symbol detection (MSD) scheme is proposed to enhance the performance of DSTBC-UWB system. After the signal model of DSTBC-UWB is analyzed, the optimal maximum likelihood (ML) MSD is derived and then sub-optimal ML-MSD is obtained by channel approximating. Despite, exhaustive search based MSD is impractical in DSTBC-UWB systems since its complexity increases exponentially with observation window size. To decrease the computational complexity, the decision-feedback (DF) scheme is introduced to MSD. The resultant DF-MSD yields reasonable complexity and solid performance improvement.