A DSSS/CDMA/FDMA Indoor Geolocation System

Ilir F. Progri, William R. Michalson and Matthew C. Bromberg

Abstract:	A direct sequence spread spectrum (DSSS) code division multiple access (CDMA), frequency division multiple access (FDMA), indoor geolocation system (IGS) is discussed in this paper. This system is an enhancement of the DSSS CDMA IGS whose modulation scheme is similar to that of the GPS [1]. The FDMA aspect of the system enables higher signal separation; thus, achieving multipath mitigation and eliminating the near-far effect. The system theoretical performance is presented in the paper. To achieve a phase error of 10 cm or less an ideal SNR of 30 dB or greater, a synchronization misalignment of 500 ns or smaller and a frequency error of 0.1 Hz or smaller are required to overcome more than 10 transmitters and up to 100 multipath components which are Rayleigh distributed.
Published in:	Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002) September 24 - 27, 2002 Oregon Convention Center Portland, OR
Pages:	155 - 164
Cite this article:	Progri, Ilir F., Michalson, William R., Bromberg, Matthew C., "A DSSS/CDMA/FDMA Indoor Geolocation System," Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002), Portland, OR, September 2002, pp. 155-164.
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