FHSS (Frequency Hopping Spread Spectrum) changes frequencies in a pattern known to both transmitter and receiver, while DSSS (Direct Sequence Spread Spectrum) spreads the signal over a wider frequency band using a specific code. Difference Between FHSS and DSSS ...
This page on DSSS versus FHSS describesdifference between DSSS and FHSS. Both are used in 802.11 WLAN and 802.15 WPAN networks. DSSS-Direct Sequence Spread Spectrum InDSSS, which stands for Direct Sequence Spread Spectrum, information bits are modulated by PN codes(chips).PN codesare Pseudonoise ...
Zero-difference balanced (ZDB) functions were introduced by Ding in connection with constructions of optimal constant composition codes and optimal and perfect difference systems of sets. Based on such functions, people have constructed optimal constant weight codes and optimal frequency-hopping sequences...