Sensitivity of SNR Degradation of OFDM to Carrier Frequency Offset in Shadowed Two-Path Channels

Wooncheol HWANG  Hongku KANG  Kiseon KIM  

IEICE TRANSACTIONS on Communications   Vol.E86-B   No.12   pp.3630-3633
Publication Date: 2003/12/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technology
OFDM,  carrier frequency offset,  SNR degradation,  two-path channel,  shadowing,  

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In this letter, a concise formula for the SNR degradation of OFDM caused by carrier frequency offset is derived by approximations over a shadowed two-path channel, which explicitly shows the sensitivity of SNR degradation to various parameters including the frequency offset. It is shown that, for small frequency offset, the SNR degradation is proportional to the square of the frequency offset and the square of the number of subcarriers. It is also shown that, if Es/N0 is reasonably large, the SNR degradation becomes insensitive to Es/N0, which is contrary to the case of the AWGN channel.