Multi-Carrier Spread-Spectrum, 2006 Proceedings from the 5th International Workshop, Oberpfaffenhofen, Germany, September 14-16, 2005

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. The aim of Multi-Carrier Spread-Spectrum is to edit the ensemble of the newest contributions and research results in this new field that have been presented during the 5th International Workshop on Multi-Carrier Spread-Spectrum (MC-SS 2005), held in Oberpfaffenhofen, Germany.

General issues.- Experiments on Space Diversity Effect in MIMO Channel Transmission with Maximum Data Rate of 1 Gbps in Downlink OFDM Radio Access.- Reduced-complexity Maximum-Likelihood Detection in Multiple-antenna-aided Multicarrier Systems.- On Coding for OFDM and the Broadcast Channel.- Adaptivity in MC-CDMA Systems.- Parameter Estimation for Interference Cancellation in Power-controlled MC-CDMA Downlink Transmissions.- Performance Evaluation and Parameter Optimization of MC-CDMA.- A Novel Algorithm of Inter-subchannel Interference Cancellation for OFDM Systems.- Comparative Multicarrier System Performance in Jamming and Fading.- CDMA in the Context of OFDM and SC/FDE – A Comparative Study.- Cellular aspects.- Impact of the Intercell Interference in DL MC-CDMA Systems.- Quantifying the Impact of the MC-CDMA Physical Layer Algorithms on the Downlink Capacity in a Multi-cellular Environment.- Radio Resource Management for MC-CDMA over Correlated Rayleigh Fading Channels.- Throughput of Heterogeneous Multi-Cell Multi-User MIMO-OFDM Systems.- Real-link Performance of a SS-MC-MA High Frequency Radio Modem.- Spreading and detection.- Analysis of Iterative Successive Interference Cancellation in SC-CDMA Systems.- Bandwidth and Power Efficient Digital Transmission using Sets of Orthogonal Spreading Codes.- Simplified Realization of Pseudo-Orthogonal Carrier Interferometry OFDM by FFT Algorithm.- Exploiting Rotated Spreading Features for CDM-OFDMA.- Detection of Pre-coded OFDM by Recovering Symbols on Degraded Carriers.- Semi-blind Multiuser Detection in Zero-padded OFDM-CDMA Systems.- A Study on Adaptive Successive Detection using M Algorithm based on ML Criterion for Down-link MC-CDMA Systems.- Channel estimation.- Channel Estimation in the Presence of Timing Offsetsfor MC-CDMA Uplink Transmissions with Combined Equalization.- Iterative Channel Estimation for MIMO MC-CDMA.- Performance Investigation of Improved Channel Estimation Exploiting Long Term Channel Properties.- Pilot Symbol-Aided Channel Estimation for MC-CDMA Systems.- Superimposed Pilot-based Channel Estimation for MIMO OFDM Code Division Multiplexing Uplink Systems.- Pilot Time-Frequency Location Adjustment in OFDM Systems Based on the Channel Variability Parameters.- Mimo and adaptivity.- Reduced Feedback Closed-Loop Spatial Multiplexing for B3G Systems.- A MIMO-OFDM Transmission Scheme Employing Subcarrier Phase Hopping.- Multicarrier SDMA System with Reduced Intra-user Cross-correlations.- Effect of Adaptive Modulation and Error Correction on Multi-Band OFDM-MIMO System.- Near Optimal Performance for High Data Rate MIMO MC-CDMA Scheme.- STBC-TCM for MC-CDMA Systems with SOVA-based Decoding and Soft-interference Cancellation.- OFDMA with Subcarrier Sharing.- New Loading Algorithms for Adaptive SS-MC-MA Systems over Power Line Channels: Comparisons with DMT.- An Investigation of Optimal Solution for Multiuser Sub-carrier Allocation in OFDMA Systems.- Optimal Solution to Adaptive Subcarrier-and-bit Allocation in Multiclass Multiuser OFDM System.- Dynamic and Scalable Bandwidth Allocation for Beyond 3G CDMA Systems.- Effective SINR Mapping for an MC-CDMA System.- Combination of H-ARQ and Iterative Multi-user Detection for OFDMA CDM.- System performance and implementation aspects.- A Comparative Analysis of CDM-OFDMA and MC-CDMA Systems.- Multi-User Transmit Power Control for Multi-carrier Modulation Systems in Quasi-synchronous Uplink Channel.- On the Compensation of IQ Imbalance in an SC/FDE System.- On Implementation Aspects of Uplink MC-CDMA Multi-user Detection.- Analytical Performance of a Frequency Offset Multi-user Multi-array System.- Effects of Subcarrier Interleaving on LDPC Coded MC-CDMA Systems.- One-shot and Iterative Symbol Predistortion Techniques for PAPR Reduction in OFDM Systems.- Iterative Correction and Decoding of OFDM Signals Affected by Clipping.- PAPR Reduction of MC-CDMA Signals by Selected Mapping with Interleavers.- Iterative Nonlinear Channel Compensation in MC-CDMA Systems.- Sidelobe Suppression in OFDM Systems.- Blind Phase Noise Estimation in OFDM Systems by Sequential Monte Carlo Method.- Sensitivity Comparison of Multi-carrier and Spread Spectrum Systems to Phase Noise.

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.

This new topic has received in the last decade great attention in the international research and industry communities The publication of the most fresh research results on the system design, algorithmic, diversity techniques detection and interference cancellation, new trends on multi-carrier synchronisation, etc. Will help designers, researchers and students to have access through this book to the latest research results on the applications and design of different mobile and fixed cellular systems based on multi-carrier spread spectrum, e.g. fourth generation mobile communications system