OFDM Transmission Technique: A Strong Candidate for the Next Generation Mobile Communications

OFDM Transmission Technique: A Strong Candidate for the Next Generation Mobile Communications

Hermann Rohling (Hamburg University of Technology, Germany)
DOI: 10.4018/978-1-59140-766-9.ch008
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The orthogonal frequency division multiplexing (OFDM) transmission technique can efficiently deal with multi-path propagation effects especially in broadband radio channels. It also has a high degree of system flexibility in multiple access schemes by combining the conventional TDMA, FDMA, and CDMA approaches with the OFDM modulation procedure, which is especially important in the uplink of a multi-user system. In OFDM-FDMA schemes carrier synchronization and the resulting sub-carrier orthogonality plays an important role to avoid any multiple access interferences (MAI) in the base station receiver. An additional technical challenge in system design is the required amplifier linearity to avoid any non-linear effects caused by a large peak-to-average ratio (PAR) of an OFDM signal. The OFDM transmission technique is used for the time being in some broadcast applications (DVB-T, DAB, DRM) and wireless local loop (WLL) standards (HIPERLAN/2, IEEE 802.11a) but OFDM has not been used so far in cellular communication networks. The general idea of the OFDM scheme is to split the total bandwidth into many narrowband sub-channels which are equidistantly distributed on the frequency axis. The sub-channel spectra overlap each other but the sub-carriers are still orthogonal in the receiver and can therefore be separated by a Fourier transformation. The system flexibility and use of sub-carrier specific adaptive modulation schemes in frequency selective radio channels are some advantages which make the OFDM transmission technique a strong and technically attractive candidate for the next generation of mobile communications. The objective of this chapter is to describe an OFDM-based system concept for the fourth generation (4G) of mobile communications and to discuss all technical details when establishing a cellular network which requires synchronization in time and frequency domain with sufficient accuracy. In this cellular environment a flexible frequency division multiple access scheme based on OFDM-FDMA is developed and a radio resource management (RRM) employing dynamic channel allocation (DCA) techniques is used. A purely decentralized and self-organized synchronization technique using specific test signals and RRM techniques based on co-channel interference (CCI) measurements has been developed and will be described in this chapter.

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Table of Contents
Gour Karmakar, Laurence S. Dooley
Gour Karmakar, Laurence S. Dooley
Chapter 1
Gour C. Karmakar, Laurence S. Dooley, Michael Mathew
In order to meet the ever increasing demand by people using mobile technology and its associated services based on multimedia elements in addition... Sample PDF
Introduction to Mobile Multimedia Communications
Chapter 2
Surendra Kumar Sivagurunathan, Mohammed Atiquzzaman
With the proliferation of wireless data networks, there is an increasing interest in carrying multimedia over wireless networks using portable... Sample PDF
Multimedia over Wireless Mobile Data Networks
Chapter 3
Nalin Sharda
The focus of this chapter is on the quality of service (QoS) aspects involved in transmitting multimedia information via mobile systems. Multimedia... Sample PDF
Quality of Service Issues in Mobile Multimedia Transmission
Chapter 4
Odej Kao, Stefan Lietsch
This chapter introduces a personalized system for device independent and position aware communication. It combines the advantages of mobile... Sample PDF
On a Personalized System for Device Independent and Position Aware Communication
Chapter 5
Nina Reeves, Sally Jo Cunningham, Laura Jefferies, Catherine Harris
Aphasia is a speech disorder usually caused by stroke or head injury (Armstrong, 1993). Related communication difficulties can include word finding... Sample PDF
Mobile Multimedia for Speech and Language Therapy
Chapter 6
Indrit Troshani, Sally Rao Hill
Mobile services are touted to create a significant spectrum of business opportunities. Acceptance of these services by users is, therefore, of... Sample PDF
A Proposed Framework for Mobile Services Adoption: A Review of Existing Theories, Extensions, and Future Research Directions
Chapter 7
Ferdous Ahmed Sohel, Gour C. Karmakar, Laurence S. Dooley
With the significant influence and increasing requirements of visual mobile communications in our everyday lives, low bit-rate video coding to... Sample PDF
Video Coding for Mobile Communications
Chapter 8
Hermann Rohling
The orthogonal frequency division multiplexing (OFDM) transmission technique can efficiently deal with multi-path propagation effects especially in... Sample PDF
OFDM Transmission Technique: A Strong Candidate for the Next Generation Mobile Communications
Chapter 9
Muhammad Mahmudul Islam, Ronald Pose, Carlo Kopp
Ad-hoc networks have been the focus of research interest in wireless networks since 1990. Nodes in an ad-hoc network can connect to each other... Sample PDF
Routing Protocols for Ad-Hoc Networks
Chapter 10
Kevin Park, Jairo A. Gutierrez
Networking is no longer a luxury but rather has reached a stage where it could be regarded as a commodity, if not a necessity. Improvements in... Sample PDF
Basics of Ubiquitous Networking
Chapter 11
Joarder Kamruzzaman
Security and privacy protection are very strong requirements for the widespread deployment of wireless technologies for commercial applications. The... Sample PDF
Wireless Security and Privacy Issues
Chapter 12
Goran Pulkkis, Kaj J. Grahn, Jonny Karlsson, Nhat Dai Tran
This chapter surveys security of mobile computing devices with focus on multimedia applications. Mobile computing devices are handheld devices such... Sample PDF
Security of Mobile Devices for Multimedia Applications
Chapter 13
Muhammad Mahmudul Islam, Ronald Pose, Carlo Kopp
Due to the nature of wireless media, dynamic network topology, resource constraints, and lack of any base station or access point, security in... Sample PDF
Security in Ad-Hoc Networks
Chapter 14
Sheikh I. Ahamed, Mohammad Zulkernine, Munirul M. Haque
Pervasive computing has progressed significantly during this decade due to the developments and advances in portable, low-cost, and light-weight... Sample PDF
Security, Privacy, and Trust for Pervasive Computing Applications
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