Blind high-resolution uplink synchronization of OFDM-based multiple access schemes


Helmut Bölcskei


Proc. of IEEE Signal Processing Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Annapolis, MD, pp. 166-169, May 1999.

DOI: 10.1109/SPAWC.1999.783045

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One of the major problems in OFDM-based multiple access schemes is uplink synchronization. In this paper, we propose an algorithm for the blind estimation of multi-user OFDM synchronization parameters. Our method assumes that all users employ the same pulse shaping filter and uses second-order statistics only. The proposed approach provides high-resolution estimates in the sense of being able to resolve closely spaced time-frequency offsets. Finally, we provide simulation results demonstrating the performance of our algorithm.


OFDM, multi-user systems, synchronization, high-resolution, ESPRIT, blind estimation, cyclostationarity

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