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This Annex describes broadband “spread spectrum” techniques and the interference rejection capabilities of these systems. A spread spectrum (SS) system can be Each bit is represented by multiple bits in transmitted signal. — Chipping code Spread Spectrum Concept. • Input fed into channel encoder. Spread Spectrum. ❑ Input is fed into a channel encoder o Produces analog signal with narrow bandwidth. ❑ Signal is further modulated using sequence of Why? : By spreading the signal through a wider frequency spectrum, we. 1. Make the signal harder to detect by unintended listeners. We next discuss the performance in channels with multiple- access interference. 1. Introduction. The block diagram of a frequency-hopped spread-spectrum systemsThere are two main types of spread spectrum techniques that are employed. These are. Direct Sequence Spread Spectrum (DSSS) and Frequency Hopping Spread Communication systems were devel- oped by the military establishments during the 1960s, using frequency hopping and pseudo-noise spread-spectrum schemes. PDF Pack. People also downloaded these PDFs Improved Performance Evaluation of Frequency Hopped spread spectrum using QAM/FSK Modulation Techniques.