Patent ID: 7529264

Claim:
A method for code division multiple access communication assigning to a first group of terminals a first pseudorandom noise code, each user of the first group of terminals being uniquely identifiable by a unique code phase offset, the first pseudorandom noise code being assigned to the first group of terminals by a first modulator; assigning to a second group of terminals the first pseudorandom noise code, with each user of the second group of terminals also being assigned a common phase offset of the first pseudorandom noise code, the first pseudorandom noise code and common phase offset being assigned to the second group of terminals by a second modulator; and assigning to each terminal of the second group of terminals a unique spreading code, the unique spreading code having a chipping rate less than a chipping rate of the first pseudorandom noise code, the spreading code being one of an orthogonal spreading code or a near-orthogonal spreading code, the spreading code being assigned by a third modulator.