Effects of synchronization errors on energy detection of UWB signals

Energy detection is attractive for UWB signal reception because of the low implementation complexity. Its performance in the presence of synchronization errors has not been addressed before. In this paper, we investigate the effects of synchronization errors on conventional energy detection (CED) with orthogonal pulse position modulation (OPPM) and block-coded pulse position modulation (BC-PPM). Moreover, the performance of weighted energy detection (WED) for OPPM and BC-PPM with respect to synchronization errors is also analyzed, where the weight vector is estimated using training symbols. The analytical results enable us to compare different combinations of energy detection and modulation scheme at various synchronization accuracy levels and drive a tradeoff between performance and synchronization requirement. Simulations show that BC-PPM is much less sensitive to mistiming than OPPM, and WED can eliminate the performance degradation caused by synchronization errors greatly.

[1]  R. Hoctor,et al.  Delay-hopped transmitted-reference RF communications , 2002, 2002 IEEE Conference on Ultra Wideband Systems and Technologies (IEEE Cat. No.02EX580).

[2]  Moe Z. Win,et al.  On the energy capture of ultrawide bandwidth signals in dense multipath environments , 1998, IEEE Communications Letters.

[3]  Ning He,et al.  Performance analysis of non-coherent UWB receivers at different synchronization levels , 2004, IEEE Global Telecommunications Conference, 2004. GLOBECOM '04..

[4]  M. E. Sahin,et al.  Optimization of energy detector receivers for UWB systems , 2005, 2005 IEEE 61st Vehicular Technology Conference.

[5]  Haige Xiang,et al.  Weighted noncoherent receivers for UWB PPM signals , 2006, IEEE Communications Letters.

[6]  Moe Z. Win,et al.  Analysis of UWB transmitted-reference communication systems in dense multipath channels , 2005, IEEE Journal on Selected Areas in Communications.

[7]  H. Urkowitz.  Energy detection of unknown deterministic signals , 1967 .

[8]  G. Leus,et al.  Noise suppression in UWB transmitted reference systems , 2004, IEEE 5th Workshop on Signal Processing Advances in Wireless Communications, 2004..

[9]  A. Molisch,et al.  IEEE 802.15.4a channel model-final report , 2004 .