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.

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.