CDMA and OFDM for multiuser communication

Principles of QAM-OFDM-Modulation by DFT Transmission via bandlimited channels, Generalized Nyquist Criterion-Basic OFDM Implementations-Cyclic OFDM Symbol Extension, OFDM Bandwidth Efficiency- Choice of the OFDM Modulation. OFDM system performance over AWGN channels- OFDM transmission over UMTS type channel Inter-subcarrier Interference cancellation

Performance with frequency and timing errors-Synchronization Algorithms-Synchronization using pilots. Motivations for Adaptive modulation -Adaptive techniques-channel quality estimation-parameter adaptation-Signaling the AOFDM parameters. Multiuser AOFDM-Adaptive transceiver architecture-Simulation results with perfect channel knowledge-Pilot-based channel parameter estimation.

Channel Estimation: LS Error Decision-Directed Channel Estimation-Derivation of the LS Estimator, Frequency Domain Parallel Interference Cancellation Aided DDCE-The Recursive Channel Estimator. Detection Techniques: Linear Detection Techniques- Least-Squares error Detector-Minimum Mean Square Error Detector. Non-Linear Detection Techniques-Standard SIC, MSIC and its Derivatives, PIC Detection.

Spread spectrum technique – Direct sequence and frequency hopping spread spectrum communication system – PN codes and Walsh codes – Rake receiver – Capacity – Effects of loading, sectorization and voice activity – Power control – Hand off – Link structure – Forward link – Pilot, synchronization, paging and traffic channels – Reverse Link – access and traffic channel.

Amalgamating DS-CDMA and OFDM Multicarrier CDMA-MC-CDMA Performance in Synchronous environments. Adaptive modulation for OFDM and MC-CDMA-System description - General model five mode AQAM-Seven-Mode Adaptive Star-QAM-Five mode APSK-Ten-mode AQAM.