Analysis of Timing and Frequency Offsets on OFDM Systems for Fractional Sampling Rate

Byungju LIM  Young-Chai KO  

Publication
IEICE TRANSACTIONS on Communications   Vol.E100-B   No.10   pp.1946-1951
Publication Date: 2017/10/01
Online ISSN: 1745-1345
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
Keyword: 
synchronization,  timing offset,  frequency offset,  OFDM systems,  fractional sampling,  

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Summary: 
Timing and frequency offsets are caused by imperfect synchronization at the receiver. These errors degrade the performance of OFDM systems by introducing inter-carrier-interference (ICI) and inter-symbol-interference (ISI). In this paper, we derive signal-to-interference ratio (SIR) analytically with timing and frequency offsets for the case that the sampling rate of analog-to-digital converter (ADC) in OFDM receiver is an integer fraction of the signal bandwidth. We find the exact form of interference power as a function of the fractional sampling rate. Our derived analysis is confirmed by simulations and can be applied to see the exact performance of OFDM systems with fractional sampling rate.