In this paper, based on the Alamouti space time block codes (STBC) and direct-sequence bipolar pulse amplitude modulation (DS-BPAM) ultra wideband (UWB) system, we investigate the STBC based DS-BPAM UWB system over IEEE UWB multipath fading channels. In order to make the benefits of multipath channels, SRake receiver is applied in this paper. Theoretical bit error probability of the STBC based multi-antenna DS-BPAM UWB system is derived and signal processing algorithm is provided. The system performance of the STBC based DS-BPAM UWB system is evaluated through both SRake receiver and conventional coherent receiver. The results show the efficiency of the STBC based DS-BPAM UWB system with SRake receiver over multipath fading channels.

STBC based DS-BPAM UWB communication system

In this paper the performance of different basis in multicarrier modulation (MCM) system over time-variant channels are analyzed and filter banks generated by different orthogonal Daubechies wavelets and bi-orthogonal wavelets are tested and compared. Due to the high spectral containment of wavelet filters, the wavelet packet MCM (WP-MCM) system performs better than the Fourier based MCM system over time-variant channels.

Performance analysis of different basis in multicarrier modulation system over time-variant channels

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STBC based DS-BPAM UWB communication system

Performance analysis of different basis in multicarrier modulation system over time-variant channels