Indoor Geolocation Using FCDMA Pseudolites: Signal Structure and Performance Analysis

The signal structure performance of a direct sequence spread spectrum (DSSS) code division multiple access (CDMA) frequency division multiple access (FDMA) pseudolite indoor communication and localization (geolocation) system is presented and discussed in this paper. The signal structure of a DSSSFCDMA (or C-CDMA) pseudolite indoor geolocation system appears to elegantly solve the near-far problem when subject to a slowly varying frequency-selective Rayleigh fading channel with additive white Gaussian noise and Doppler shift, which is the main obstacle of a DSSS-CDMA pseudolite indoor geolocation system at roughly equal transmitter and post radio frequency (RF) receiver complexity. Based on our theoretical analysis and simulation results it appears that FCDMA or (C-CDMA) signal structure may be a suitable candidate for indoor geolocation to achieve 3-D centimeter level position accuracy and 3-D centimeter-per-second level velocity accuracy 99.9% of the time.