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Geolocation in ad hoc networks using DS-CDMA and generalized successive interference cancellation

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5 Author(s)
Sunwoo Kim ; Dept. of Electr. & Comput. Eng., Univ. of California, Santa Barbara, CA, USA ; A. P. Brown ; T. Pals ; R. A. Iltis
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Channel estimation and distributed positioning algorithms are presented for geolocation in a wireless ad hoc network. The network uses a direct-sequence code-division multiple-access-based handshaking protocol, in which nodes receive multiple acknowledgment packets in response to a request-to-send waveform. Round-trip travel time (RTT) and angle-of-arrival (AOA) measurements are obtained using the generalized successive interference cancellation/matching pursuits (GSIC/MP) algorithm. The performance of GSIC/MP is evaluated via simulation and comparison to the Crame´r-Rao bound. Position estimates are initialized using linearized least-squares and updated by an extended Kalman filter-based algorithm that includes measurement validation for nonline-of-sight error mitigation. The method is generalized for distributed estimation in sparsely connected networks: at each node, position estimates from connected nodes are incorporated via a fusion algorithm and updated using locally processed RTT/AOA measurements. Finally, comprehensive ad hoc network simulations are presented including channel ray tracing, RTT/AOA estimation and validation, and distributed positioning.

Published in:

IEEE Journal on Selected Areas in Communications  (Volume:23 ,  Issue: 5 )