Patent ID: 7394792
Filing Date: 2008-07-01
Classification: H04J

Abstract:
1. A method for reducing a CDMA chip rate, said method comprising the steps of: partitioning a CDMA frequency band into a set of equal size frequency subbands; generating two orthogonal CDMA codes with a first CDMA code having first CDMA code indices for encoding data symbols within each subband, and a second CDMA code having second CDMA code indices for encoding data symbols over the entire set of subbands, wherein the first CDMA code provides a first scale of CDMA encoding and the second CDMA code provides a second scale of CDMA encoding; generating a 2-scale CDMA code using a tensor product of the second CDMA code with the first CDMA code to generate the 2-scale CDMA code; wherein the steps of generating further include encoding data symbols with said 2-scale CDMA code to generate encoded chips; assigning each of the encoded chips to a subband in accordance with the second CDMA code indices, and assigning each encoded chip to a chip position within its assigned subband in accordance with the first CDMA code indices; and encoding said encoded chips with pseudonoise (PN) encoding.