SIR analysis and interference cancellation in uplink OFDMA with large carrier frequency/timing offsets

Authors:
K. Raghunath;A. Chockalingam
Affiliations:
Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore, India;Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore, India
Venue:
IEEE Transactions on Wireless Communications
Year:
2009

Citing 2
Cited 1

Cancellation of Multiuser Interference Due to Carrier Frequency Offsets in Uplink OFDMA

IEEE Transactions on Wireless Communications
Line search based iterative joint estimation of channels and frequency offsets for uplink OFDM systems

IEEE Transactions on Wireless Communications

SC-FDMA versus OFDMA: sensitivity to large carrier frequency and timing offsets on the uplink

GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications

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Abstract

In uplink orthogonal frequency division multiple access (OFDMA), large timing offsets (TO) and/or carrier frequency offsets (CFO) of other users with respect to a desired user can cause significant multiuser interference (MUI). In this letter, we analytically characterize the degradation in the average output signal-to-interference ratio (SIR) due to the combined effect of both TOs as well as CFOs in uplink OFDMA. Specifically, we derive closed-form expressions for the average SIR at the DFT output in the presence of large CFOs and TOs. The analytical expressions derived for the signal and various interference terms at the DFT output are used to devise an interference cancelling receiver to mitigate the effect of CFO/TO-induced interferences.