Patent ID: 6963599

Claim:
In a method of communicating information between at least two points using spread spectrum communications technology wherein said information is digitized and encoded, said encoded information is used to modulate a baseband signal having greater bandwidth than the bandwidth of said information, said baseband signal is in turn used to modulate a carrier signal to be transmitted from a first point, and wherein said transmitted signal is received, demodulated and decoded at a second point so as to replicate the information sent, the improvement wherein: said information encoding step comprises the substeps of: establishing a plurality of subsets of tones to represent each possible state of said digitized information during a given timing interval, the tones comprising each said subset being selected from a set of N frequencies; for selected successive timing intervals, establishing a new plurality of said subsets of tones from said set N, wherein selection of said tones comprising each of said subsets of tones is established based on a known coding sequence; and said baseband modulation step comprises the substep of: selecting the subset of tones corresponding to an increment of said digitized information to be transmitted during a timing interval.