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.

Broadband Wireless Access Based on VSF-OFCDM and VSCRF-CDMA and 3 its Experiments *.- An OFDM Based System Proposal for 4G Downlinks*.- Channel Overloading in CDMA with Scalable Signature Sets and Turbo Detection.- Virtual Subcarrier Assignment (VISA): Principle and Applications.- On Pilot-Symbol Aided Channel Estimation for MC-CDMA in the Presence of Cellular Interference.- New 2D-MC-DS-SS-CDMA Techniques based on Two-dimensional 49 Orthogonal Complete Complementary Codes.- Performance of Multirate Transmission Schemes for MC-CDMA Systems.- Priority Swapping Subcarrier-User Allocation Technique for Adaptive Multi carrier Based Systems.- Sub-band Loading for Pre-Equalized Uplink OFDM-CDMA Systems.- A Study on Subcarrier Power Control of OFDM Transmission Diversity combined with Data Spreading.- Packet Re-Transmission Options for the SS-OFDM-F/TA System.- Comparison of Iterative Detection Schemes for MIMO Systems with Spreading Based on OFDM.- Turbo Product Codes for an Orthogonal Multicarrier DS-CDMA System.- Performance Evaluation of Diversity Gain and Coding Gain in Coded Orthogonal Multi-Carrier Modulation Systems.- Adaptive Coding in MC-CDMA/FDM Systems with Adaptive Sub-Band Allocation.- A Study of Multicarrier CDMA Systems with Differential Modulation.- Spreading Sequences for (Multi-Carrier) MC-CDMA Systems with Nonlinear Amplifier.- Analysis of Linear Receivers for MC-CDMA with Digital Prolate Functions.- Evaluation of Different Spreading Sequences for MC-CDMA in WLAN Environments.- Uplink and Downlink MC-DS-CDMA Synchronization Sensitivity*.- Study of Symbol Synchronization in MC-CDMA Systems.- Iterative Channel Estimation Approach for Space-Frequency Coded OFDM Systems with Transmitter Diversity.- Comparison of Pilot Multiplexing Schemes for ML Channel Estimation in Coded OFDM-CDMA.- Data Aided Channel Estimation for Wireless MIMO-OFDM Systems.- Multi-User Transmissions for OFDM: Channel Estimation and Performances.- Adaptive Pilot Symbol Aided Channel Estimation for OFDM Systems.- Exploiting A-Priori Information for Channel Estimation in Multiuser OFDM Mobile Radio Systems.- Timing of the FFT-Window in SC/FDE Systems.- Equalization for Multi-Carrier Systems in Time-Varying Channels.- Performance Analysis of the Downlink and Uplink of MC-CDMA with Carrier Frequency Offset.- Space Time Multi-User Detection for MC-CDMA Systems in the Presence of Channel Estimation Errors.- Synchronisation and Power Control Processes for Uplink Multicarrier Systems based on MC-CDMA Technique.- A Novel Soft Handoff Technique using STTD for MC-CDMA in a Frequency Selective Fading Channel*.- Array Antenna Assisted Doppler Spread Compensator with Vehicle Speed Estimator for OFDM Receiver.- Pre-Filtering Techniques Using Antenna Arrays for Downlink TDD MC-CDMA Systems.- Downlink Strategies Using Antenna Arrays for Interference Mitigation in Multi-Carrier CDMA.- Antenna Diversity Techniques for SC/FDE — A System Analysis.- Performance of MC-CDMA vs. OFDM in Rayleigh Fading Channels.- Efficient Diversity Techniques Using Linear Precoding and STBC for Multi-Carrier Systems.- Performance of MMSE STBC MC-CDMA over Rayleigh and MIMO METRA Channels.- Comparison between Space-Time Block Coding and Eigen Beamforming in TDD MIMO-OFDM Downlink with Partial CSI Knowledge at the TX Side.- Space-Time Block Coding for OFDM-MIMO Systems for Fourth Generation: Performance Results.- Space-Frequency Coding and Signal Processing for Downlink MIMO MC-CDMA.- Adaptive V-BLAST based Broadband MIMO Systems in Spatially Correlated Channels.- Design of the Low ComplexityTurbo MIMO Receiver for WLAN.- Distributed Multiplexing in Multicarrier Wireless Networks.- An Inter-Cell Interference Suppression Technique Using Virtual Subcarrier Assignment (VISA) for MC-CDMA Uplink.- Synchronism Loss Effect on the Signal Detection at the Base Station using an OFDM-CDMA System.- Minimum BER Multiuser Transmission for Spread-Spectrum Systems in Frequency Selective Channels.- Combined Pre- and Post-Equalization Techniques for Uplink Time Division Duplex MC-CDMA in Fading Channels.- Time Variant Channel Equalization for MC-CDMA via Fourier Basis Functions.- Impact of Channel Variation on a Code Multiplexed Pilot in Multicarrier Systems.- Joint Compensation of IQ Imbalance, Frequency Offset and Phase Noise.- Practical Issues of PIC in MC-CDMA Systems.- OFDM, DS-CDMA and MC-CDMA Systems with Phase Noise and Frequency Offset Effects.- A New Phase Noise Mitigation Method in OFDM Systems with Simultaneous CPE and ICI Correction.- Performance Comparison of OFDM Transmission affected by Phase Noise with and without PLL.