Multi-Carrier Spread-Spectrum: For Future Generation Wireless Systems, Fourth International Workshop, Germany, September 1719, 2003 [Paperback]

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.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 TransmissilÃ?