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

Authors:
K. Raghunath;A. Chockalingam
Affiliations:
Indian Institute of Science, Bangalore, India;Indian Institute of Science, Bangalore, India
Venue:
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Year:
2009

Citing 2
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SIR analysis and interference cancellation in uplink OFDMA with large carrier frequency/timing offsets

IEEE Transactions on Wireless Communications
Cancellation of Multiuser Interference Due to Carrier Frequency Offsets in Uplink OFDMA

IEEE Transactions on Wireless Communications

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Abstract

In this paper, we present a comparison between the sensitivity of SC-FDMA and OFDMA schemes to large carrier frequency offsets (CFO) and timing offsets (TO) of different users on the uplink. Our study shows the following observations: 1) In the ideal case of zero CFOs and TOs (i.e., perfect synchronization), the uncoded BER performance of SC-FDMA with frequency domain MMSE equalizer is better than that of OFDMA due to the inherent frequency diversity that is possible in SCFDMA. Also, because of inter-symbol interference in SC-FDMA, the performance of SC-FDMA with MMSE equalizer can be further improved by using low-complexity interference cancellation (IC) techniques. 2) In the presence of large CFOs and TOs, significant multiuser interference (MUI) gets introduced, and hence the performance of SC-FDMA with MMSE equalizer can get worse than that of OFDMA. However, the performance advantage of SC-FDMA with MMSE equalizer over OFDMA (due to the potential for frequency diversity benefit in SC-FDMA) can be restored by adopting multistage IC techniques, using the knowledge of CFOs and TOs of different users at the receiver.