Impact of Carrier Frequency Offset on Received SNR in Dual-Hop OFDM Systems with a Fixed Relay

In-Ho LEE  Dongwoo KIM  

IEICE TRANSACTIONS on Communications   Vol.E92-B   No.8   pp.2755-2758
Publication Date: 2009/08/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.2755
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
carrier frequency offset,  dual-hop OFDM system,  average SNR,  fixed relay,  frequency-selective fading,  

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In this letter, we present the impact of carrier frequency offset (CFO) in dual-hop orthogonal frequency division multiplexing (OFDM) systems with a fixed relay for frequency-selective fading channels. Approximate expressions of the average signal-to-noise ratios (SNRs) for both downlink and uplink are obtained and validated by simulations. It is shown that dual-hop systems have slightly worse average SNR degradation than single-hop systems. We also show that the average SNR degradation due to the CFO varies according to the gap between average received SNRs for the first and the second hop.