Multi-Carrier Spread-Spectrum, 2004 For Future Generation Wireless Systems, Fourth International Workshop, Germany, September 17-19, 2003

The benefits and success of multi-carrier (MC) modulation on one side and the flexibility offered by the spread spectrum (SS) technique on the other side have motivated many researchers to investigate the combination of both techniques since 1993. This combination known as multi-carrier spread spectrum (MC-SS) benefits from the advantages of both systems and offers high flexibility, high spectral efficiency, simple detection strategies, narrow-band interference rejection capability, etc. The basic principle of this combination is straightforward: The spreading is performed as direct sequence spread spectrum (DS-SS) but instead of transmitting the chips over a single carrier, several sub-carriers are employed. The MC modulation and demodulation can easily be realized in the digital domain by performing IFFT and FFT operations. The separation of the users' signals can be performed in the code domain. MC-SS systems can perform the spreading in frequency direction, which allows for simple signal detection strategies. Since 1993, MC-SS has been deeply studied and new alternative solutions have been proposed. Meanwhile, deep system analysis and comparison with DS-CDMA have been performed that show the superiority of MC-CDMA.

* Editorial Introduction. Acknowledgement. * I: General Issues. Broadband Wireless Access Based on VSF-OFCDM and VSCRF-CDMA and its Experiments*; H. Atarashi, M. Sawahashi. An OFDM Based System Proposal for 4G Downlinks*; A. Svensson, A. Ahlen, A. Brunstrom, T. Ottosson, M. Sternad. Channel Overloading in CDMA with Scalable Signature Sets and Turbo Detection; F. Vanhaverbeke, M. Moeneclaey. Virtual Subcarrier Assignment (VISA): Principle and Applications; S. Hara. On Pilot-Symbol Aided Channel Estimation for MC-CDMA in the Presence of Cellular Interference; G. Auer, A. Dammann, S. Sand, S. Kaiser. New 2D-MC-DS-SS-CDMA Techniques based on Two-dimensional Orthogonal Complete Complementary Codes; P. Farkas, M. Turcsany. Performance of Multirate Transmission Schemes for MC-CDMA Systems; Z. Li, M. Latva-aho. Priority Swapping Sub-carrier and User Allocation Techniques for Adaptive Multi-carrier Based Systems; E. Al-Susa, D. Cruickshank, S. McLaughlin. Sub-band Loading for Pre-Equalized Uplink OFDM-CDMA Systems; N. Benvenuto, P. Bisaglia, F. Tosato. A Study on Subcarrier Power Control of OFDM Transmission Diversity combined with Data Spreading; S. Kanamori, M. Itami, K. Itoh, H. Ohta. Packet Re-Transmission Options for the SS-OFDM-F/TA System; R. Novak, W.A. Krzymien. Comparison of Iterative Detection Schemes for MIMO Systems with Spreading Based on OFDM; D.Yacoub, M.A. Dangl, U.Marxmeier, W.G. Teich, J. Lindner. * II: Coding, Modulation And Spreading. Turbo Product Codes for an Orthogonal Multicarrier DS-CDMA System; D.A. Guimaraes, J. Portugheis. Performance Evaluation of Diversity Gain and Coding Gain in Coded Orthogonal Multi-Carrier Modulation Systems; M. Fujii, M. Itami, K.Itoh. Adaptive Coding in MC-CDMA/FDM Systems with Adaptive Sub-Band Allocation; P. Trifonov, E. Costa, A. Filippi, M. Weckerle. A Study of Multicarrier CDMA Systems with Differential Modulation; H. Xing, M. Renfors. Spreading Sequences for Multi-Carrier CDMA Systems with Nonlinear Amplifier; M. Saito, T. Hara, M. Okada, H. Yamamoto, T. Gima. Analysis of Linear Receivers for MC-CDMA with Digital Prolate Functions; I. Raos, A. del Cacho, S. Zazo. Evaluation of Different Spreading Sequences for MC-CDMA in WLAN Environments; A. Garcia-Armanda, J.R. De Torre, V. P. Gil Jimenez, M. J. Fernandez-Getino Garci. * III: Synchronization And Channel Estimation. Uplink and Downlink MC-DS-CDMA Synchronization Sensitivity*; H. Steendam, M. Moeneclaey. Study of Symbol Synchronization in MC-CDMA Systems; Y. Zhang, R. Hoshyar, R. Tafazolli. Iterative Channel Estimation Approach for Space-Frequency Coded OFDM Systems with Transmitter Diversity; H.A. Cirpan, H. Dogan, E. Panayirci. Comparison of Pilot Multiplexing Schemes for ML Channel Estimation in Coded OFDM-CDMA; M. Feuersänger, F. Hasenknopf, V. Kühn, K-D. Kammeyer. Data Aided Channel Estimation for Wireless MIMO-OFDM Systems; M. Honglei, M.J. Juntti. Multi-User Transmissions for OFDM: Channel Estimation and Performances; M. Chenu-Tournier, A. Renoult, I. Fijalkow. Adaptive Pilot Symbol Aided Channel Estimation for OFDM Systems; S. Sand, A. Dammann, G. Auer. Exploiting A-Priori Information for Channel Estimation in Multiuser OFDM Mobile Radio Systems; I. Maniatis, T. Weber, M. Weckerle. Timing of the FFT-Window in SC/FDE Systems; A. Koppler, M. Huemer, A. Springer, R. Weigel. Equalization for Multi-Carrier Systems in Time-Varying Channels; S. Gligorevic, R.

Stefan Kaiser was the first researcher to address the institutional and legal aspects of the future air navigation systems in a pioneering thesis presented to the Institute of Air and Space Law, McGill University.