Low-Sampling Rate UWB Channel Characterization and Synchronization

• Published in: Journal of communications and networks Vol. 5; no. 4; pp. 319 - 327
• Main Authors: Maravic, Irena, Kusuma, Julius, Vetterli, Martin
• Format: Journal Article
• Language: Korean
• Published: 한국통신학회 01.12.2003
• Subjects: 전자/정보통신공학; multipath channel; UWB; channel modeling; channel estimation; annihilating filters; timing; sampling
• ISSN: 1229-2370; 1976-5541

We consider the problem of low-sampling rate high-resolution channel estimation and timing for digital ultrawideband (UWB) receivers. We extend some of our recent results in sampling of certain classes of parametric non-bandlimited signals and develop a frequency domain method for channel estimation and synchronization in ultra-wideband systems, which uses sub-Nyquist uniform sampling and well-studied computational procedures. In particular, the proposed method can be used for identification of more realistic channel models, where different propagation paths undergo different frequency-selective fading. Moreover, we show that it is possible to obtain high-resolution estimates of all relevant channel parameters by sampling a received signal below the traditional Nyquist rate. Our approach leads to faster acquisition compared to current digital solutions, allows for slower A/D converters, and potentially reduces power consumption of digital UWB receivers significantly.