A Scheme for Initial Ranging in OFDMA-Based Networks

Web Published:


            Researchers at Princeton University and the University of Pisa have developed a novel Initial Ranging scheme for OFDMA networks where carrier frequency offsets, timing errors and power levels are estimated for all ranging subscriber stations.   Princeton is currently seeking industrial collaborators to commercialize this technology.


            Existing Initial Ranging schemes estimate the timing offsets and power levels of ranging subscriber stations without taking into account possible carrier frequency offsets between the received signals and the base station local reference.  This new scheme improves on existing designs by estimating carrier frequency offsets and power levels through subspace-based methods while the least-squares criterion is employed for timing recovery.  Computer simulations are used to assess the effectiveness of the proposed solution and to make comparisons with existing alternatives.


It is anticipated that this new approach can be utilized by companies working to develop next generation broadband wireless communication systems.   Patent protection is pending.




L. Sanguinetti, M. Morelli and H. V. Poor, 

¿An Improved Scheme for Initial Ranging in OFDMA-based Networks,¿

Proceedings of the 2008 IEEE International Conference on Communications

Beijing, May 19 ¿ 23, 2008.


L. Sanguinetti, M. Morelli and H. V. Poor,  

¿A Subspace-Decomposition Approach for Initial Ranging in OFDMA Systems,¿ 

Proceedings of the Ninth IEEE Workshop on Signal Processing Advances in Wireless Communications

Recife, Brazil, July 6 ¿ 9, 2008.




            For more information please contact:


                        William H. Gowen

                        Office of Technology Licensing and Intellectual Property

                        Princeton University

                        4 New South Building

                        Princeton, NJ 08544-0036

                        (609) 258-6762

                        (609) 258-1159 fax


Patent Information:
For Information, Contact:
John Ritter
Princeton University
H. Vincent Poor
Michele Morelli
Luca Sanguinetti