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In recent years, ultra-wideband (UWB) technique was considered as a candidate for short range high data rate communications with precise location and positioning ability at the order of centimeter, and many contributions have been presented by researchers, which promoted the development of UWB technique. In this paper, the state of the art and new development of UWB technique was presented in terms...
The combination of ultra-wideband technique and cooperative technique can improve the performance of ultra-wideband communications effectively and reduce the power consumption. In order to improve the system performance as well as reduce the hardware cost, a cooperative ultra-wideband system model using transmitted reference receiver and decode-and-forward (DF) relay protocol is proposed, and normalized...
Ultra-Wideband (UWB) communication has attracted more attentions due to its advantages in short range applications. As one of the key techniques in UWB systems, many pulse shaping methods have been proposed. The semi-definite programming (SDP) based pulse shaping method can obtain the pulse with highest power efficiency by far. However, an accurate timing of 40 ps is required, and such requirement...
Power control techniques are adopted in narrow-band systems to overcome near-far effects by varying transmitted power levels so that all signals are received with equal power level. However, since the transmission data rate is too high in ultra-wideband (UWB) in which multimedia communication is desired to realize, it is impossible to accomplish perfect power control with current technologies and...
In impulse radio (IR) type Ultra-Wideband (UWB) communications, orthogonal waveforms confirm to given spectral mask are desired to improve system capacity. Therefore, in this paper, an orthogonal wavelet based pulse shaping algorithm is proposed and compactly supported Meyer wavelet is used as an example to show how to obtain orthogonal pulses. Simulation results show that the proposed algorithm can...
In recently years, with the release of spectral mask by the Federal Communications Commission (FCC), ultra-wideband (UWB) communications by means of impulse-radio (IR) are gaining increasing interest. In order to optimize transmission power spectrum, judicious pulse shaping is required. This paper proposed a modified Hermite function based pulse shaping algorithm and the simulation results show that...
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