Integration Window Position Estimation in TR Receivers

Transmitted-reference (TR) receivers avoid the stringent synchronization requirements that exist in conventional pulse detection schemes. However, the performance of such receivers is highly sensitive to precise timing acquisition and tracking as well as the length of their integration window. This window in TR receivers defines the limits of the finite integrator prior to the final decision making block. In this paper, we propose a novel technique that allows us to extract the timing information of the integration window very accurately in UWB-TR receivers in the presence of channel noise. The principles of the method are presented and the BER performance of a modified UWB-TR receiver is investigated by computer simulation. Our studies show that the proposed estimation technique adds value to the conventional TR receiver structure with modest increase in complexity.

[1]  Craig K. Rushforth.  Transmitted-reference techniques for random or unknown channels , 1964, IEEE Trans. Inf. Theory.

[2]  Urbashi Mitra,et al.  Synchronization and channel estimation for UWB signal , 2003, GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489).

[3]  U. Mitra,et al.  Integration interval optimization and performance analysis for UWB transmitted reference systems , 2004, 2004 International Workshop on Ultra Wideband Systems Joint with Conference on Ultra Wideband Systems and Technologies. Joint UWBST & IWUWBS 2004 (IEEE Cat. No.04EX812).

[4]  Moe Z. Win,et al.  Ultra-wide bandwidth time-hopping spread-spectrum impulse radio for wireless multiple-access communications , 2000, IEEE Trans. Commun..

[5]  V. Srinivasa Somayazulu,et al.  A differential detector for an ultra-wideband communications system , 2002, Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367).

[6]  Martin Vetterli,et al.  Low-sampling rate UWB channel characterization and synchronization , 2003, Journal of Communications and Networks.

[7]  F. Dowla,et al.  Interference mitigation in transmitted-reference ultra-wideband (UWB) receivers , 2004, IEEE Antennas and Propagation Society Symposium, 2004..

[8]  J. Hancock,et al.  A Transmitted Reference System for Communication in Random of Unknown Channels , 1965 .

[9]  W.E. Stark,et al.  Performance of autocorrelation receivers for ultra-wideband communications with PPM in multipath channels , 2002, 2002 IEEE Conference on Ultra Wideband Systems and Technologies (IEEE Cat. No.02EX580).

[10]  Jeff Foerster,et al.  Ultra-Wideband Technology for Short- or Medium-Range Wireless Communications , 2001 .

[11]  Zhiqiang Wu,et al.  Generalized fading channel model with application to UWB , 2002, 2002 IEEE Conference on Ultra Wideband Systems and Technologies (IEEE Cat. No.02EX580).

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

[13]  Moe Z. Win,et al.  Impulse radio: how it works , 1998, IEEE Communications Letters.

[14]  Kannan Ramchandran,et al.  Channel estimation and synchronization with sub-Nyquist sampling and application to ultra-wideband systems , 2004, 2004 IEEE International Symposium on Circuits and Systems (IEEE Cat. No.04CH37512).