SINR analysis of time and frequency offsets in OFDM systems

Author

Sharifi, Shahrouz ; Khalaj, Babak Hossein

Author_Institution

Dept. of Electr. Eng., Sharif Univ. of Technol., Tehran, Iran

fYear

2011

fDate

4-7 Oct. 2011

Firstpage

855

Lastpage

859

Abstract

In this paper, the impact of both time offsets (TOs) and carrier frequency offsets (CFOs) on the average output signal-to-interference-plus-noise ratio (SINR) in a frequency selective channel is investigated with a novel approach. First, TOs are partitioned into Ave cases based on how they occur. Then the mathematical models for different cases are derived. Considering CFOs and benefiting from the obtained models, closed-form expression for the SINR in each case is derived. It is proved that, SINR is independent of the observed subcarrier for the given TO and CFO. Besides, it is shown that the performance of the affected system deteriorates rapidly as the number of subcarriers increases. It is also revealed that, as far as the guard interval is longer than the channel delay spread, the SINR is not much sensitive to the number of channel taps and power delay profile.

Keywords

OFDM modulation; mathematical analysis; telecommunication channels; OFDM systems; carrier frequency offsets; channel delay; channel taps; closed-form expression; frequency selective channel; mathematical models; power delay profile; signal-to-interference-plus-noise ratio; time offsets; Delay; Discrete Fourier transforms; Interference; OFDM; Signal to noise ratio; Synchronization; Time frequency analysis; Orthogonal frequency-division multiplexing (OFDM); carrier frequency offset; signal-to-interference-plus-noise ratio (SINR); synchronization-errors; time offset;

fLanguage

English

Publisher

ieee

Conference_Titel

Local Computer Networks (LCN), 2011 IEEE 36th Conference on

Conference_Location

Bonn

ISSN

0742-1303

Print_ISBN

978-1-61284-926-3

Type

conf

DOI

10.1109/LCN.2011.6115562

Filename

6115562