Optimized null-subcarrier selection for CFO estimation in OFDM over frequency-selective fading channels

Mounir Ghogho, Ananthram Swami, Georgios B. Giannakis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

71 Scopus citations

Abstract

We address the problem of frequency synchronization in OFDM-based communications systems in the context of frequency-selective fading channels. Frequency offsets are estimated by inserting null sub-carriers into a single OFDM block. The paper clarifies issues related to acquisition range and identifiability of carrier frequency offset (CFO), and performance of estimators. A deterministic maximum likelihood estimation approach is adopted. We derive necessary and sufficient conditions on the number of null-subcarriers and their placement in order to ensure identifiability. The Cramér-Rao bound (CRB) for the CFO is derived; for a given number of null sub-carriers, the optimal placement which minimizes the CRB is derived. We show that if the number of null sub-carriers is less than half the total number of sub-carriers, performance is optimal when the null sub-carriers are equispaced.

Original languageEnglish (US)
Title of host publicationConference Record / IEEE Global Telecommunications Conference
Pages202-206
Number of pages5
Volume1
StatePublished - Dec 1 2001
EventIEEE Global Telecommunicatins Conference GLOBECOM'01 - San Antonio, TX, United States
Duration: Nov 25 2001Nov 29 2001

Other

OtherIEEE Global Telecommunicatins Conference GLOBECOM'01
CountryUnited States
CitySan Antonio, TX
Period11/25/0111/29/01

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