The definition of Ultra Wide Band (UWB) signals released by the Federal Communications Commissions (FCC) opened the way to both impulse and non-impulse UWB signal formats, as reflected within the IEEE 802.15.3a TG, devoted to the definition of a standard for UWB-based high bit rate WPANs. The two main proposals considered in this group are a Multi Band OFDM approach, based on the transmission of non-impulse OFDM signals combined with Frequency Hopping (FH), and the Direct-Sequence (DS) UWB approach, based on impulse radio transmission of UWB DS-coded pulses. In this paper, the ranging capabilities of the two proposals are investigated by determining the Cramer-Rào Lower Bound (CRLB) for the distance estimation error. The CRUB is evaluated with both ideal and real, multipath-affected, channel models and the impact of multipath on ranging accuracy is quantified. Results show that DS-UWB is, in general, best suited for ranging, thanks to its larger bandwidth and its higher frequencies of operation, although multipath may affect in a different way DS-UWB and MB-OFDM signals. © 2005 IEEE.
UWB ranging accuracy for applications within IEEE 802.15.3a / R., Cardinali; DE NARDIS, Luca; Lombardo, Pierfrancesco; DI BENEDETTO, Maria Gabriella. - STAMPA. - 2005:(2005), pp. 65-69. (Intervento presentato al convegno 2nd International Workshop Networking with Ultra Wide Band/Workshop on Ultra Wide Band for Sensor Networks tenutosi a Rome; Italy nel JUL 04-06, 2005) [10.1109/netuwb.2005.1470004].
UWB ranging accuracy for applications within IEEE 802.15.3a
DE NARDIS, LUCA;LOMBARDO, Pierfrancesco;DI BENEDETTO, Maria Gabriella
2005
Abstract
The definition of Ultra Wide Band (UWB) signals released by the Federal Communications Commissions (FCC) opened the way to both impulse and non-impulse UWB signal formats, as reflected within the IEEE 802.15.3a TG, devoted to the definition of a standard for UWB-based high bit rate WPANs. The two main proposals considered in this group are a Multi Band OFDM approach, based on the transmission of non-impulse OFDM signals combined with Frequency Hopping (FH), and the Direct-Sequence (DS) UWB approach, based on impulse radio transmission of UWB DS-coded pulses. In this paper, the ranging capabilities of the two proposals are investigated by determining the Cramer-Rào Lower Bound (CRLB) for the distance estimation error. The CRUB is evaluated with both ideal and real, multipath-affected, channel models and the impact of multipath on ranging accuracy is quantified. Results show that DS-UWB is, in general, best suited for ranging, thanks to its larger bandwidth and its higher frequencies of operation, although multipath may affect in a different way DS-UWB and MB-OFDM signals. © 2005 IEEE.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
