EAVESDROPPER PERFORMANCE IN CELLULAR CDMA

We study eavesdropper performance in power-controlled cellular CDMA sy stems. A significant hindrance to eavesdropping in the reverse channel is the wide range of potential received powers from active users; alt hough power control insures that all users are received with approxima tely equal power at the base station, it does not concern itself with the rest of the cell. Susceptibility to the near-far problem is demons trated, and performance sensitivity to eavesdropper location is shown to depend on a single off-centered-ness parameter. Both circular and l inear cell geometries are considered, with log-distance and log-normal shadowing models adopted for signal path loss. A comparison of severa l eavesdropper detection strategies is performed, demonstrating a pote ntial for significant performance improvement through the use of multi user detection techniques.