A comparison of timing methods in orthogonal frequency division multiplexing (OFDM) systems

Orthogonal frequency division multiplexing (OFDM) is being used by wireless local area network (WLAN) standards, such as IEEE 802.11a, and wireless metropolitan area network (MAN) standards, such as IEEE 802.16a. OFDM is a very efficient communications scheme for wireless ADHOC networks. However, the wireless environment causes inter-symbol interference (ISI) and inter-carrier interference (ICI). Estimating the starting point of an OFDM symbol must be handled efficiently and effectively to reduce the errors. OFDM must be time synchronized to prevent inter-symbol interference (ISI) and inter-carrier interference (ICI). Many techniques exist to realize timing synchronization in OFDM systems. In this thesis, the need for timing synchronization, the timing errors, and the performance of different techniques under a variety of mobile channel models (indoor and outdoor) are investigated, and simulation performance results for each technique under different channel models are presented.

Department dc:contributor.department

Electrical and Computer Engineering (ECE)

Grantor dc:publisher

Monterey, CA; Naval Postgraduate School

Year dc:date.issued

2004

Author dc:creator

• Oz, Ersoy

Advisors dc:contributor.advisor

• Cristi, Roberto
• Tummala, Murali

Statement dc:rights

• The copyright is reserved by the copyright owner.

Handle dc:identifier.uri

https://hdl.handle.net/10945/1372

OAI identifier oai:identifier

oai:calhoun.nps.edu:10945/1372