I am reading an article that is about CDMA. In that article I faced toencountered a term "spreading vetor". I searched some books such as ProakisProakis and GallagerGallager to see what does it meanmeans. I even surfed internet for this statement, but I found some other terms such as "spreading siginiture"signature" but not "Spreading Vector"vector". Can any one explain the meaning of "Spreading Vector"invector" in digital communication?