Joint Estimation of the Timing and Frequency Offset for Uplink OFDMA

Authors:
Huan Cong Nguyen;Elisabeth Carvalho;Ramjee Prasad
Affiliations:
Center for TeleInFrastructure, Aalborg University, Aalborg, Denmark;Center for TeleInFrastructure, Aalborg University, Aalborg, Denmark;Center for TeleInFrastructure, Aalborg University, Aalborg, Denmark
Venue:
Wireless Personal Communications: An International Journal
Year:
2010

Citing 1
Cited 3

OFDM Wireless LANs: A Theoretical and Practical Guide

OFDM Wireless LANs: A Theoretical and Practical Guide

Blind Residual Carrier Frequency Offset and Timing Offset Estimation Using Improved Minimum Output Variance Approaches in Uplink MC-CDMA Systems

Wireless Personal Communications: An International Journal
Symbol Detection of IDMA Systems in the Presence of Carrier Frequency Offsets

Wireless Personal Communications: An International Journal
An Iterative CFO Estimation Using MVDR Criterion for Interleaved OFDMA Uplink Systems

Wireless Personal Communications: An International Journal

Quantified Score

Hi-index	0.00

Visualization

Abstract

Inheriting all the advantages of Orthogonal Frequency Division Multiplexing (OFDM), plus the ability to offer a fine level of bit granularity and dynamic subcarrier allocation for multiuser diversity, the Orthogonal Frequency Division Multiple Access (OFDMA) has emerged as a potential candidate for multiple access technique for future broadband wireless networks. However, the benefits of OFDMA come with stringent requirements on synchronization, especially in the uplink. Unless the timing offsets (TOs) and carrier frequency offsets (CFOs) among users in the uplink are kept under tolerable ranges, inter-symbol interference (ISI), inter-channel interference (ICI) and multi-user interference (MUI) will occur, which degrade the overall system performance severely. Accurate estimation of TOs and CFOs is required for each user, so that they can be accounted for at the user's side or compesated for at the base station. This paper proposes a novel method to estimate jointly TOs and CFOs in the time-domain for multi-user in the OFDMA uplink. The method is shown to offer good accuracy, while maintaining a reasonable complexity compared to conventional estimation schemes.