Performance Evaluation of Timing Synchronization in OFDM-Based Cognitive Radio Systems

Author

Zivkovic, Milan ; Mathar, Rudolf

Author_Institution

Inst. for Theor. Inf. Technol., RWTH Aachen Univ., Aachen, Germany

fYear

2011

fDate

5-8 Sept. 2011

Firstpage

1

Lastpage

5

Abstract

In this paper, the performance of Schmidl and Cox (S&C) timing estimator in cognitive radio systems under a fractional bandwidth (FBW) scenario is investigated. The synchronization preamble is appropriately modified in order to avoid transmission in the subbands where primary users (PU) are active. However, at the receiver, the timing synchronizer processes all received signal samples within the given OFDM band without any knowledge of a PU presence, thus being affected by interference. Statistical properties of timing metric in the presence of interference caused by PU are derived for an AWGN channel.

Keywords

OFDM modulation; cognitive radio; performance evaluation; radiofrequency interference; synchronisation; AWGN channel; FBW; OFDM-based cognitive radio systems; PU; fractional bandwidth; interference; performance evaluation; primary users; statistical properties; timing metric; timing synchronization; Interference; OFDM; Resource management; Signal to noise ratio; Synchronization;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference (VTC Fall), 2011 IEEE

Conference_Location

San Francisco, CA

ISSN

1090-3038

Print_ISBN

978-1-4244-8328-0

Type

conf

DOI

10.1109/VETECF.2011.6092909

Filename

6092909