Quasi-Coherent Delay Lock Loop Tracking and Generalized Binary Coded Symbols in Multipath

摘要

This discussion first examines the QCDLL and its performance for conventional PN signals, and then generalizes the family of symbol coding/spread-rning techniques. The BOC signal, first called the split-spectrum signal, has a limited but important ability to shape the spectrum. It also increases its Ga-bor bandwidth and corresponding noise performance as indicated by the Cramer-Rao bound. However, the BOC signal has large autocorrelation sidelobes that when operating on both sidelobes simultaneously can cause limitations. There are BOC receivers which avoid that issue by operating separately on upper and lower frequency components. However, our focus is on more general symbol-coding techniques that reduce autocorrelation sidelobes and provide good multipath performance.