Direct Sequence Spread Spectrum Modulation (DSSS)

This lecture introduces Direct Sequence Spread Spectrum Modulation (DSSS) as a method to distribute signals over a wider bandwidth than required, aiming to hide signals below the noise floor, avoid interference, and improve accuracy of localization. It covers the concept of spreading signals, different flavors of spread spectrum modulation, signal representation, basis functions for wideband signal waveforms, and the receiver structure for DSSS. The lecture also discusses the impact of spreading on Signal-to-Noise Ratio (SNR) and Signal-to-Interferer Ratio (SIR), emphasizing the advantages of spreading signals across all dimensions to reduce interference. Additionally, it explains the performance of DSSS in terms of SNR and SIR, highlighting the benefits of spreading in improving signal quality.