• CHANNEL ESTIMATION
• FREQUENCY DOMAIN EQUALIZATION
• SIDELOBE SUPPRESSION
• TIMING AND FREQUENCY SYNCHRONIZATION

Future wireless communication systems are expected to support high-speed and high-quality multimedia service. In these applications the received signal is tipically affected by frequency-selective fading and channel equalization is required to mitigate the resulting intersymbol interference. The classical approach in single-carrier systems is time-domain equalization (tde), but it is not suitable for high-speed transmissions. A promising alternatives to tde are single-carrier systems with frequency-domain equalization (sc-fde) and multi-carrier systems (for example ofdm). These techniques use the fast fourier transform (fft) algorithm. This leads to substantial computational saving with respect to conventional tde. In this thesis it considers an sc-fde system and an ofdm system. Different timing, frequency and channel estimation algorithms are developed. Moreover a new sidelobe suppression method in ofdm system is analyzed. Results are drawn in terms of performance and complexity.