Characterization of UWB time reversal using circular array measurements

Time reversal is a promising technique for the improvement of future telecommunication systems. A better understanding of this capability requires more investigation on real channels. This paper presents a new scheme to characterize the space-time focusing characteristics of time reversal. An extensive UWB propagation experiment is reported. The method is applied to the experimental data. Different focusing parameters are computed in different configurations. In UWB SISO configuration, time reversal increases the power of the strongest path by up to 10 dB. The channel is focused in time but the delay spread parameter remains unchanged. The average size of the spot is about 3 lambda which is larger than the ideal case. The focusing spot is often directed inline with the transmitter. At 9 lambda far from the target, the received signal is reduced by up to 10 dB in NLOS.

[1]  William S. Hodgkiss,et al.  An initial demonstration of underwater acoustic communication using time reversal , 2002 .

[2]  A.A.M. Saleh,et al.  A Statistical Model for Indoor Multipath Propagation , 1987, IEEE J. Sel. Areas Commun..

[3]  Pascal Pagani,et al.  Experimental Analysis of the Ultra Wideband Propagation Channel Over the 3.1 GHz - 10.6 GHz Frequency Band , 2006, 2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications.

[4]  Chenming Zhou,et al.  Time Reversal With MISO for Ultrawideband Communications: Experimental Results , 2006, IEEE Antennas and Wireless Propagation Letters.

[5]  D. Jackson,et al.  Phase conjugation in underwater acoustics , 1991 .

[6]  Nan Guo,et al.  Time reversal with MISO for ultra-wideband communications: experimental results , 2006, 2006 IEEE Radio and Wireless Symposium.

[7]  H.C. Song,et al.  Coherent MIMO time reversal communications in shallow water , 2004, Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600).

[8]  G. Papanicolaou,et al.  Predicted Time Reversal Performance in Wireless Communications Using Channel Measurements , .

[9]  Nan Guo,et al.  Demonstrating Time Reversal in Ultra-wideband Communications Using Time Domain Measurements , 2005 .

[10]  Roux,et al.  Robust Acoustic Time Reversal with High-Order Multiple Scattering. , 1995, Physical review letters.

[11]  G. Lerosey,et al.  Time reversal of wideband microwaves , 2006 .

[12]  P. Kyritsi,et al.  Time reversal techniques for wireless communications , 2004, IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004.

[13]  Hung Tuan Nguyen,et al.  The potential use of time reversal techniques in multiple element antenna systems , 2005, IEEE Communications Letters.