In contrast to most WLAN localization approaches in literature, which are  based
on  received  signal  strength   indicator  (RSSI),  we  examine   the  location
capabilities  of  signal propagation  delay  measurements. We  use  IEEE 802.11b
throughout this paper, as  it has become the  most common WLAN standard.  Signal
propagation delays are determined by  direct sampling of RF-signals captured  by
WLAN   antennas  and   subsequent  cross-correlation   and  interpolation.   The
functionality  of  the system  is  evaluated by  wired  measurements and  in  an
anechoic chamber. In addition, a real world measurement campaign performed in an
indoor environment will be presented.