Patent ID: 7342904

Claim:
A system for transmitting data having first and second bandwidths, the second bandwidth being narrower than the first bandwidth, the system comprising: means for dividing the first bandwidth data into a predefined number of data streams, the predefined number being associated with the ratio of the second bandwidth to the first bandwidth; means for encoding the data streams with at least one first code to produce a first plurality of orthogonally encoded data streams, the first codes being selected from a set of mutually orthogonal codes; means for inverting every other bit of the first plurality of orthogonally encoded data streams; means for combining the first plurality of orthogonally encoded data streams into a first bandwidth spreaded signal; means for encoding the second bandwidth data with a second code to produce a second bandwidth spreaded signal, wherein when a ratio of the first bandwidth to the second bandwidth is an even number, and the first and second codes are selected from the set of mutually orthogonal codes such that no first or second code or its complement is a prefix for another first or second code or its complement; a first transmitter for transmitting the first bandwidth spreaded signal at a first carrier frequency; and a second transmitter for transmitting the second bandwidth spreaded signal at a second carrier frequency simultaneously with the first bandwidth spreaded signal, wherein the first bandwidth spreaded signal overlays the second bandwidth spreaded signal in a frequency spectrum.