**7. References**


[9] Pardinas-Mir J.A, Muller M, Lamberti R, Gimenes C (2011) TR-UWB detection and synchronization - Using the Time Delayed Sampling and Correlation detection method. Proc. 8th EuRAD Conf. pp.202-205.

38 Ultra Wideband – Current Status and Future Trends

Rshdee Alhakim and Emmanuel Simeu

*TIMA Laboratory, Grenoble University, Grenoble, France* 

*LAUM Laboratory, Maine University, Le Mans, France* 

Networks. John Wiley & Sons. pp. 53-81.

Telecommun. Conf. pp. 3123-3127.

canal de propagation radioélectrique. Hermes. 246 p.

efficiency.

**Author details** 

Kosai Raoof

**7. References** 

105-110.

250.

performance of the proposed TDT estimator, and confirm that DA mode has the high performance and fast timing, compared to NDA mode, but that is at the price of bandwidth

In tracking section, we demonstrate tracking system design taking into consideration the relative motion between Transmitter and receiver. We combine DLL with TDT, which enables to enhance the received energy capture and to improve tracking performance. Simulation results illustrated that increasing natural frequency parameter ߱ helps to

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[2] Tian Z, Giannakis G.B (2006) Timing Synchronization for UWB Impulse Radios. In: Shen X, Guizani M, Qiu R.C, Ngoc T.L, editors. UWB Wireless Commun. and

[3] Win M.Z, Scholtz R.A (1998) On the energy capture of ultrawide bandwidth signals in

[4] Homier E.A, Scholtz R.A (2002) Rapid acquisition of Ultra-Wideband signals in the dense multipath channel. Proc. IEEE Conf. Ultra Wideband Systems and Techno. pp.

[5] Fleming R, Kushner C, Roberts G, Nandiwada U (2002) Rapid acquisition for Ultra-Wideband localizers. Proc. IEEE Conf. Ultra Wideband Systems and Techno. pp. 245-

[6] Yang L, Tian Z, Giannakis G.B (2003) Non-data aided timing acquisition of Ultra-Wideband transmissions using cyclostationarity. Proc. IEEE Conf. ASSP. pp. 121-124. [7] Strohmer T, Emami M, Hansen J, Papanicolaou G, Paulraj A.J (2004) Application of time-reversal with MMSE equalizer to UWB communications. IEEE Global

[8] Zhang H, Goeckel D.L (2003) Generalized Transmitted-Reference UWB Systems. Proc.

IEEE Conf. Ultra Wideband Systems and Techno. pp. 147-151.

dense multipath environments. IEEE Commun. Letters. pp. 245-247.

reduce transient error effect, but in the price of noise handling ability.

	- [25] Jaffe R, Rechtin E (1955) Design and performance of phase-lock circuits capable of nearoptimum performance over a wide range of input signal and noise levels. IRE Trans. Inf. Theory. pp. 66–76.

**Chapter 3** 

© 2012 Wang et al., licensee InTech. This is an open access chapter distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

© 2012 Wang et al., licensee InTech. This is a paper distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

**Radar Sensing Using Ultra Wideband** 

Ultra-wideband (UWB) has received significant attention for applications in target positioning and wireless communications recently. The extremely short pulses in turn generate a very wide bandwidth and offer several advantages, such as large throughput, covertness, robustness to jamming, lower power, and coexistence with current radio services. UWB not only can transmit a huge amount of data over a short distance at very low power, but also has the capability to pass through physical objects that tend to reflect

The extremely narrow pulse (usually in order of few nanoseconds to few hundred picoseconds) makes it possible to build radar with much better spatial resolution (usually 0.1 to 1 ft) and very short-range capability compared to other conventional radars. Also, the large bandwidth allows the UWB radar to get more information about the possible surrounding targets and detect, identify, and locate only the most desired target among others. The fine resolution makes the UWB radar beneficial for medical applications. The properties of short pulse indicate that the UWB signal can penetrate a great variety of biological materials such as organic tissues, fat, blood, and bone. Experiment results show that the signals with low center frequencies achieve better material penetration. Compared to a radar system with a pulse-length of one microsecond, a short Gaussian or Gaussian monopole pulse of 200ps in width has a wavelength in free space of only 60 mm, compared to 300m. Since the pulse length in conventional radar is significantly longer than the size of the target of interest, the majority of the duration of the returned signal is an exact replica of the radiated signal. Thus, the returned signal provides little information about the nature of the target. However, since the UWB pulse length is in the same order of magnitude with the potential targets, UWB radar reflected pulses are changed by the target structure and electrical characteristics. Those changes in pulse waveform provide valuable information

**– Design and Implementation** 

Xubo Wang, Anh Dinh and Daniel Teng

http://dx.doi.org/10.5772/48587

signals with narrow bandwidth.

**1. Introduction** 

Additional information is available at the end of the chapter

[26] Rappaport T.S (2001) Wireless Communications: Principles and Practice 2nd ed. Prentice Hall. pp. 139-196.

**Chapter 3** 
