No abstract

No abstract

No abstract

Ultra Wide-Band (UWB) radio uses base-band pulses of very short duration, thereby spreading the energy of radio signal very thinly over gigahertz. Power Spectral Density (PSD) of UWB signals consists of continuous and discrete components. Since the discrete component contributes more to PSD than continuous component, it presents greater interference to other narrow-band wireless systems. UWB was approved by the FCC for commercial deployment in 2002. In order to ensure negligible mutual interference, the FCC has specified emission limits for UWB applications. UWB is now under consideration as an alternative physical layer technology for wireless PAN in IEEE 802.15.3a. However, little study has been reported on PSD issues in IEEE 802.15.3a. This paper presents analysis on PSD of UWB signals in IEEE 802.15.3a systems, and on what frame reversion can achieve in reducing the PSD.

No abstract

Ultra Wide-Band (UWB) is now under consideration as an alternative physical layer technology for wireless PAN. UWB radio uses base-band pulses of very short duration, thereby spreading the energy of radio signal very thinly over gigahertz. The Power Spectral Density (PSD) of UWB signals consists of continuous component and discrete component. Generally speaking, the discrete component presents greater interference to narrow-band communication systems than the continuous component. Frame synchronization is commonly used in multiple access systems, including wireless PAN systems.The sync word will generate strong PSD. In this paper, we devise a more efficient and better performance mechanism to suppress the discrete component of the PSD of UWB signals by randomizing the pattern of UWB signals. The mechanism can also be applied to payload data to smooth the PSD of USB signals.

No abstract

No abstract