The Efficiency of Spread Spectrum Signaling With Respect to Spectrum Utilization

The past decade has seen increased interest in spread spectrum systems on the part of the United States military services, based primarily on the ability of such systems to operate in the presence of deliberate jamming signals which would render conventional, i.e., narrow-band, systems inoperative. Other features of interest in spread spectrum systems which have been exploited in various ways include; the relative immunity of such systems from inadver­ tent interference, the ease with which such systems can provide multiple access communications networks, and for navigation and location purposes the precise timing information which can be derived from systems employing high rates in the spectrum spreading func­ tion. by employing increasingly complex coding procedures the actual rate R may be made to approach the number C as closely as desired.